1/* 2 * Copyright (c) 1995, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26package java.net; 27 28import java.io.IOException; 29import java.io.InputStream; 30import java.net.spi.URLStreamHandlerProvider; 31import java.security.AccessController; 32import java.security.PrivilegedAction; 33import java.util.Hashtable; 34import java.io.InvalidObjectException; 35import java.io.ObjectStreamException; 36import java.io.ObjectStreamField; 37import java.io.ObjectInputStream.GetField; 38import java.util.Iterator; 39import java.util.Locale; 40import java.util.NoSuchElementException; 41import java.util.ServiceConfigurationError; 42import java.util.ServiceLoader; 43 44import jdk.internal.misc.JavaNetURLAccess; 45import jdk.internal.misc.SharedSecrets; 46import sun.security.util.SecurityConstants; 47import sun.security.action.GetPropertyAction; 48 49/** 50 * Class {@code URL} represents a Uniform Resource 51 * Locator, a pointer to a "resource" on the World 52 * Wide Web. A resource can be something as simple as a file or a 53 * directory, or it can be a reference to a more complicated object, 54 * such as a query to a database or to a search engine. More 55 * information on the types of URLs and their formats can be found at: 56 * <a href= 57 * "http://web.archive.org/web/20051219043731/http://archive.ncsa.uiuc.edu/SDG/Software/Mosaic/Demo/url-primer.html"> 58 * <i>Types of URL</i></a> 59 * <p> 60 * In general, a URL can be broken into several parts. Consider the 61 * following example: 62 * <blockquote><pre> 63 * http://www.example.com/docs/resource1.html 64 * </pre></blockquote> 65 * <p> 66 * The URL above indicates that the protocol to use is 67 * {@code http} (HyperText Transfer Protocol) and that the 68 * information resides on a host machine named 69 * {@code www.example.com}. The information on that host 70 * machine is named {@code /docs/resource1.html}. The exact 71 * meaning of this name on the host machine is both protocol 72 * dependent and host dependent. The information normally resides in 73 * a file, but it could be generated on the fly. This component of 74 * the URL is called the <i>path</i> component. 75 * <p> 76 * A URL can optionally specify a "port", which is the 77 * port number to which the TCP connection is made on the remote host 78 * machine. If the port is not specified, the default port for 79 * the protocol is used instead. For example, the default port for 80 * {@code http} is {@code 80}. An alternative port could be 81 * specified as: 82 * <blockquote><pre> 83 * http://www.example.com:1080/docs/resource1.html 84 * </pre></blockquote> 85 * <p> 86 * The syntax of {@code URL} is defined by <a 87 * href="http://www.ietf.org/rfc/rfc2396.txt"><i>RFC 2396: Uniform 88 * Resource Identifiers (URI): Generic Syntax</i></a>, amended by <a 89 * href="http://www.ietf.org/rfc/rfc2732.txt"><i>RFC 2732: Format for 90 * Literal IPv6 Addresses in URLs</i></a>. The Literal IPv6 address format 91 * also supports scope_ids. The syntax and usage of scope_ids is described 92 * <a href="Inet6Address.html#scoped">here</a>. 93 * <p> 94 * A URL may have appended to it a "fragment", also known 95 * as a "ref" or a "reference". The fragment is indicated by the sharp 96 * sign character "#" followed by more characters. For example, 97 * <blockquote><pre> 98 * http://java.sun.com/index.html#chapter1 99 * </pre></blockquote> 100 * <p> 101 * This fragment is not technically part of the URL. Rather, it 102 * indicates that after the specified resource is retrieved, the 103 * application is specifically interested in that part of the 104 * document that has the tag {@code chapter1} attached to it. The 105 * meaning of a tag is resource specific. 106 * <p> 107 * An application can also specify a "relative URL", 108 * which contains only enough information to reach the resource 109 * relative to another URL. Relative URLs are frequently used within 110 * HTML pages. For example, if the contents of the URL: 111 * <blockquote><pre> 112 * http://java.sun.com/index.html 113 * </pre></blockquote> 114 * contained within it the relative URL: 115 * <blockquote><pre> 116 * FAQ.html 117 * </pre></blockquote> 118 * it would be a shorthand for: 119 * <blockquote><pre> 120 * http://java.sun.com/FAQ.html 121 * </pre></blockquote> 122 * <p> 123 * The relative URL need not specify all the components of a URL. If 124 * the protocol, host name, or port number is missing, the value is 125 * inherited from the fully specified URL. The file component must be 126 * specified. The optional fragment is not inherited. 127 * <p> 128 * The URL class does not itself encode or decode any URL components 129 * according to the escaping mechanism defined in RFC2396. It is the 130 * responsibility of the caller to encode any fields, which need to be 131 * escaped prior to calling URL, and also to decode any escaped fields, 132 * that are returned from URL. Furthermore, because URL has no knowledge 133 * of URL escaping, it does not recognise equivalence between the encoded 134 * or decoded form of the same URL. For example, the two URLs:<br> 135 * <pre> http://foo.com/hello world/ and http://foo.com/hello%20world</pre> 136 * would be considered not equal to each other. 137 * <p> 138 * Note, the {@link java.net.URI} class does perform escaping of its 139 * component fields in certain circumstances. The recommended way 140 * to manage the encoding and decoding of URLs is to use {@link java.net.URI}, 141 * and to convert between these two classes using {@link #toURI()} and 142 * {@link URI#toURL()}. 143 * <p> 144 * The {@link URLEncoder} and {@link URLDecoder} classes can also be 145 * used, but only for HTML form encoding, which is not the same 146 * as the encoding scheme defined in RFC2396. 147 * 148 * @author James Gosling 149 * @since 1.0 150 */ 151public final class URL implements java.io.Serializable { 152 153 static final String BUILTIN_HANDLERS_PREFIX = "sun.net.www.protocol"; 154 static final long serialVersionUID = -7627629688361524110L; 155 156 /** 157 * The property which specifies the package prefix list to be scanned 158 * for protocol handlers. The value of this property (if any) should 159 * be a vertical bar delimited list of package names to search through 160 * for a protocol handler to load. The policy of this class is that 161 * all protocol handlers will be in a class called <protocolname>.Handler, 162 * and each package in the list is examined in turn for a matching 163 * handler. If none are found (or the property is not specified), the 164 * default package prefix, sun.net.www.protocol, is used. The search 165 * proceeds from the first package in the list to the last and stops 166 * when a match is found. 167 */ 168 private static final String protocolPathProp = "java.protocol.handler.pkgs"; 169 170 /** 171 * The protocol to use (ftp, http, nntp, ... etc.) . 172 * @serial 173 */ 174 private String protocol; 175 176 /** 177 * The host name to connect to. 178 * @serial 179 */ 180 private String host; 181 182 /** 183 * The protocol port to connect to. 184 * @serial 185 */ 186 private int port = -1; 187 188 /** 189 * The specified file name on that host. {@code file} is 190 * defined as {@code path[?query]} 191 * @serial 192 */ 193 private String file; 194 195 /** 196 * The query part of this URL. 197 */ 198 private transient String query; 199 200 /** 201 * The authority part of this URL. 202 * @serial 203 */ 204 private String authority; 205 206 /** 207 * The path part of this URL. 208 */ 209 private transient String path; 210 211 /** 212 * The userinfo part of this URL. 213 */ 214 private transient String userInfo; 215 216 /** 217 * # reference. 218 * @serial 219 */ 220 private String ref; 221 222 /** 223 * The host's IP address, used in equals and hashCode. 224 * Computed on demand. An uninitialized or unknown hostAddress is null. 225 */ 226 transient InetAddress hostAddress; 227 228 /** 229 * The URLStreamHandler for this URL. 230 */ 231 transient URLStreamHandler handler; 232 233 /* Our hash code. 234 * @serial 235 */ 236 private int hashCode = -1; 237 238 private transient UrlDeserializedState tempState; 239 240 /** 241 * Creates a {@code URL} object from the specified 242 * {@code protocol}, {@code host}, {@code port} 243 * number, and {@code file}.<p> 244 * 245 * {@code host} can be expressed as a host name or a literal 246 * IP address. If IPv6 literal address is used, it should be 247 * enclosed in square brackets ({@code '['} and {@code ']'}), as 248 * specified by <a 249 * href="http://www.ietf.org/rfc/rfc2732.txt">RFC 2732</a>; 250 * However, the literal IPv6 address format defined in <a 251 * href="http://www.ietf.org/rfc/rfc2373.txt"><i>RFC 2373: IP 252 * Version 6 Addressing Architecture</i></a> is also accepted.<p> 253 * 254 * Specifying a {@code port} number of {@code -1} 255 * indicates that the URL should use the default port for the 256 * protocol.<p> 257 * 258 * If this is the first URL object being created with the specified 259 * protocol, a <i>stream protocol handler</i> object, an instance of 260 * class {@code URLStreamHandler}, is created for that protocol: 261 * <ol> 262 * <li>If the application has previously set up an instance of 263 * {@code URLStreamHandlerFactory} as the stream handler factory, 264 * then the {@code createURLStreamHandler} method of that instance 265 * is called with the protocol string as an argument to create the 266 * stream protocol handler. 267 * <li>If no {@code URLStreamHandlerFactory} has yet been set up, 268 * or if the factory's {@code createURLStreamHandler} method 269 * returns {@code null}, then the {@linkplain java.util.ServiceLoader 270 * ServiceLoader} mechanism is used to locate {@linkplain 271 * java.net.spi.URLStreamHandlerProvider URLStreamHandlerProvider} 272 * implementations using the system class 273 * loader. The order that providers are located is implementation 274 * specific, and an implementation is free to cache the located 275 * providers. A {@linkplain java.util.ServiceConfigurationError 276 * ServiceConfigurationError}, {@code Error} or {@code RuntimeException} 277 * thrown from the {@code createURLStreamHandler}, if encountered, will 278 * be propagated to the calling thread. The {@code 279 * createURLStreamHandler} method of each provider, if instantiated, is 280 * invoked, with the protocol string, until a provider returns non-null, 281 * or all providers have been exhausted. 282 * <li>If the previous step fails to find a protocol handler, the 283 * constructor reads the value of the system property: 284 * <blockquote>{@code 285 * java.protocol.handler.pkgs 286 * }</blockquote> 287 * If the value of that system property is not {@code null}, 288 * it is interpreted as a list of packages separated by a vertical 289 * slash character '{@code |}'. The constructor tries to load 290 * the class named: 291 * <blockquote>{@code 292 * <package>.<protocol>.Handler 293 * }</blockquote> 294 * where {@code <package>} is replaced by the name of the package 295 * and {@code <protocol>} is replaced by the name of the protocol. 296 * If this class does not exist, or if the class exists but it is not 297 * a subclass of {@code URLStreamHandler}, then the next package 298 * in the list is tried. 299 * <li>If the previous step fails to find a protocol handler, then the 300 * constructor tries to load a built-in protocol handler. 301 * If this class does not exist, or if the class exists but it is not a 302 * subclass of {@code URLStreamHandler}, then a 303 * {@code MalformedURLException} is thrown. 304 * </ol> 305 * 306 * <p>Protocol handlers for the following protocols are guaranteed 307 * to exist on the search path :- 308 * <blockquote><pre> 309 * http, https, file, and jar 310 * </pre></blockquote> 311 * Protocol handlers for additional protocols may also be available. 312 * Some protocol handlers, for example those used for loading platform 313 * classes or classes on the class path, may not be overridden. The details 314 * of such restrictions, and when those restrictions apply (during 315 * initialization of the runtime for example), are implementation specific 316 * and therefore not specified 317 * 318 * <p>No validation of the inputs is performed by this constructor. 319 * 320 * @param protocol the name of the protocol to use. 321 * @param host the name of the host. 322 * @param port the port number on the host. 323 * @param file the file on the host 324 * @exception MalformedURLException if an unknown protocol or the port 325 * is a negative number other than -1 326 * @see java.lang.System#getProperty(java.lang.String) 327 * @see java.net.URL#setURLStreamHandlerFactory( 328 * java.net.URLStreamHandlerFactory) 329 * @see java.net.URLStreamHandler 330 * @see java.net.URLStreamHandlerFactory#createURLStreamHandler( 331 * java.lang.String) 332 */ 333 public URL(String protocol, String host, int port, String file) 334 throws MalformedURLException 335 { 336 this(protocol, host, port, file, null); 337 } 338 339 /** 340 * Creates a URL from the specified {@code protocol} 341 * name, {@code host} name, and {@code file} name. The 342 * default port for the specified protocol is used. 343 * <p> 344 * This constructor is equivalent to the four-argument 345 * constructor with the only difference of using the 346 * default port for the specified protocol. 347 * 348 * No validation of the inputs is performed by this constructor. 349 * 350 * @param protocol the name of the protocol to use. 351 * @param host the name of the host. 352 * @param file the file on the host. 353 * @exception MalformedURLException if an unknown protocol is specified. 354 * @see java.net.URL#URL(java.lang.String, java.lang.String, 355 * int, java.lang.String) 356 */ 357 public URL(String protocol, String host, String file) 358 throws MalformedURLException { 359 this(protocol, host, -1, file); 360 } 361 362 /** 363 * Creates a {@code URL} object from the specified 364 * {@code protocol}, {@code host}, {@code port} 365 * number, {@code file}, and {@code handler}. Specifying 366 * a {@code port} number of {@code -1} indicates that 367 * the URL should use the default port for the protocol. Specifying 368 * a {@code handler} of {@code null} indicates that the URL 369 * should use a default stream handler for the protocol, as outlined 370 * for: 371 * java.net.URL#URL(java.lang.String, java.lang.String, int, 372 * java.lang.String) 373 * 374 * <p>If the handler is not null and there is a security manager, 375 * the security manager's {@code checkPermission} 376 * method is called with a 377 * {@code NetPermission("specifyStreamHandler")} permission. 378 * This may result in a SecurityException. 379 * 380 * No validation of the inputs is performed by this constructor. 381 * 382 * @param protocol the name of the protocol to use. 383 * @param host the name of the host. 384 * @param port the port number on the host. 385 * @param file the file on the host 386 * @param handler the stream handler for the URL. 387 * @exception MalformedURLException if an unknown protocol or the port 388 is a negative number other than -1 389 * @exception SecurityException 390 * if a security manager exists and its 391 * {@code checkPermission} method doesn't allow 392 * specifying a stream handler explicitly. 393 * @see java.lang.System#getProperty(java.lang.String) 394 * @see java.net.URL#setURLStreamHandlerFactory( 395 * java.net.URLStreamHandlerFactory) 396 * @see java.net.URLStreamHandler 397 * @see java.net.URLStreamHandlerFactory#createURLStreamHandler( 398 * java.lang.String) 399 * @see SecurityManager#checkPermission 400 * @see java.net.NetPermission 401 */ 402 public URL(String protocol, String host, int port, String file, 403 URLStreamHandler handler) throws MalformedURLException { 404 if (handler != null) { 405 SecurityManager sm = System.getSecurityManager(); 406 if (sm != null) { 407 // check for permission to specify a handler 408 checkSpecifyHandler(sm); 409 } 410 } 411 412 protocol = toLowerCase(protocol); 413 this.protocol = protocol; 414 if (host != null) { 415 416 /** 417 * if host is a literal IPv6 address, 418 * we will make it conform to RFC 2732 419 */ 420 if (host.indexOf(':') >= 0 && !host.startsWith("[")) { 421 host = "["+host+"]"; 422 } 423 this.host = host; 424 425 if (port < -1) { 426 throw new MalformedURLException("Invalid port number :" + 427 port); 428 } 429 this.port = port; 430 authority = (port == -1) ? host : host + ":" + port; 431 } 432 433 int index = file.indexOf('#'); 434 this.ref = index < 0 ? null : file.substring(index + 1); 435 file = index < 0 ? file : file.substring(0, index); 436 int q = file.lastIndexOf('?'); 437 if (q != -1) { 438 this.query = file.substring(q + 1); 439 this.path = file.substring(0, q); 440 this.file = path + "?" + query; 441 } else { 442 this.path = file; 443 this.file = path; 444 } 445 446 // Note: we don't do validation of the URL here. Too risky to change 447 // right now, but worth considering for future reference. -br 448 if (handler == null && 449 (handler = getURLStreamHandler(protocol)) == null) { 450 throw new MalformedURLException("unknown protocol: " + protocol); 451 } 452 this.handler = handler; 453 } 454 455 /** 456 * Creates a {@code URL} object from the {@code String} 457 * representation. 458 * <p> 459 * This constructor is equivalent to a call to the two-argument 460 * constructor with a {@code null} first argument. 461 * 462 * @param spec the {@code String} to parse as a URL. 463 * @exception MalformedURLException if no protocol is specified, or an 464 * unknown protocol is found, or {@code spec} is {@code null}, 465 * or the parsed URL fails to comply with the specific syntax 466 * of the associated protocol. 467 * @see java.net.URL#URL(java.net.URL, java.lang.String) 468 */ 469 public URL(String spec) throws MalformedURLException { 470 this(null, spec); 471 } 472 473 /** 474 * Creates a URL by parsing the given spec within a specified context. 475 * 476 * The new URL is created from the given context URL and the spec 477 * argument as described in 478 * RFC2396 "Uniform Resource Identifiers : Generic * Syntax" : 479 * <blockquote><pre> 480 * <scheme>://<authority><path>?<query>#<fragment> 481 * </pre></blockquote> 482 * The reference is parsed into the scheme, authority, path, query and 483 * fragment parts. If the path component is empty and the scheme, 484 * authority, and query components are undefined, then the new URL is a 485 * reference to the current document. Otherwise, the fragment and query 486 * parts present in the spec are used in the new URL. 487 * <p> 488 * If the scheme component is defined in the given spec and does not match 489 * the scheme of the context, then the new URL is created as an absolute 490 * URL based on the spec alone. Otherwise the scheme component is inherited 491 * from the context URL. 492 * <p> 493 * If the authority component is present in the spec then the spec is 494 * treated as absolute and the spec authority and path will replace the 495 * context authority and path. If the authority component is absent in the 496 * spec then the authority of the new URL will be inherited from the 497 * context. 498 * <p> 499 * If the spec's path component begins with a slash character 500 * "/" then the 501 * path is treated as absolute and the spec path replaces the context path. 502 * <p> 503 * Otherwise, the path is treated as a relative path and is appended to the 504 * context path, as described in RFC2396. Also, in this case, 505 * the path is canonicalized through the removal of directory 506 * changes made by occurrences of ".." and ".". 507 * <p> 508 * For a more detailed description of URL parsing, refer to RFC2396. 509 * 510 * @param context the context in which to parse the specification. 511 * @param spec the {@code String} to parse as a URL. 512 * @exception MalformedURLException if no protocol is specified, or an 513 * unknown protocol is found, or {@code spec} is {@code null}, 514 * or the parsed URL fails to comply with the specific syntax 515 * of the associated protocol. 516 * @see java.net.URL#URL(java.lang.String, java.lang.String, 517 * int, java.lang.String) 518 * @see java.net.URLStreamHandler 519 * @see java.net.URLStreamHandler#parseURL(java.net.URL, 520 * java.lang.String, int, int) 521 */ 522 public URL(URL context, String spec) throws MalformedURLException { 523 this(context, spec, null); 524 } 525 526 /** 527 * Creates a URL by parsing the given spec with the specified handler 528 * within a specified context. If the handler is null, the parsing 529 * occurs as with the two argument constructor. 530 * 531 * @param context the context in which to parse the specification. 532 * @param spec the {@code String} to parse as a URL. 533 * @param handler the stream handler for the URL. 534 * @exception MalformedURLException if no protocol is specified, or an 535 * unknown protocol is found, or {@code spec} is {@code null}, 536 * or the parsed URL fails to comply with the specific syntax 537 * of the associated protocol. 538 * @exception SecurityException 539 * if a security manager exists and its 540 * {@code checkPermission} method doesn't allow 541 * specifying a stream handler. 542 * @see java.net.URL#URL(java.lang.String, java.lang.String, 543 * int, java.lang.String) 544 * @see java.net.URLStreamHandler 545 * @see java.net.URLStreamHandler#parseURL(java.net.URL, 546 * java.lang.String, int, int) 547 */ 548 public URL(URL context, String spec, URLStreamHandler handler) 549 throws MalformedURLException 550 { 551 String original = spec; 552 int i, limit, c; 553 int start = 0; 554 String newProtocol = null; 555 boolean aRef=false; 556 boolean isRelative = false; 557 558 // Check for permission to specify a handler 559 if (handler != null) { 560 SecurityManager sm = System.getSecurityManager(); 561 if (sm != null) { 562 checkSpecifyHandler(sm); 563 } 564 } 565 566 try { 567 limit = spec.length(); 568 while ((limit > 0) && (spec.charAt(limit - 1) <= ' ')) { 569 limit--; //eliminate trailing whitespace 570 } 571 while ((start < limit) && (spec.charAt(start) <= ' ')) { 572 start++; // eliminate leading whitespace 573 } 574 575 if (spec.regionMatches(true, start, "url:", 0, 4)) { 576 start += 4; 577 } 578 if (start < spec.length() && spec.charAt(start) == '#') { 579 /* we're assuming this is a ref relative to the context URL. 580 * This means protocols cannot start w/ '#', but we must parse 581 * ref URL's like: "hello:there" w/ a ':' in them. 582 */ 583 aRef=true; 584 } 585 for (i = start ; !aRef && (i < limit) && 586 ((c = spec.charAt(i)) != '/') ; i++) { 587 if (c == ':') { 588 String s = toLowerCase(spec.substring(start, i)); 589 if (isValidProtocol(s)) { 590 newProtocol = s; 591 start = i + 1; 592 } 593 break; 594 } 595 } 596 597 // Only use our context if the protocols match. 598 protocol = newProtocol; 599 if ((context != null) && ((newProtocol == null) || 600 newProtocol.equalsIgnoreCase(context.protocol))) { 601 // inherit the protocol handler from the context 602 // if not specified to the constructor 603 if (handler == null) { 604 handler = context.handler; 605 } 606 607 // If the context is a hierarchical URL scheme and the spec 608 // contains a matching scheme then maintain backwards 609 // compatibility and treat it as if the spec didn't contain 610 // the scheme; see 5.2.3 of RFC2396 611 if (context.path != null && context.path.startsWith("/")) 612 newProtocol = null; 613 614 if (newProtocol == null) { 615 protocol = context.protocol; 616 authority = context.authority; 617 userInfo = context.userInfo; 618 host = context.host; 619 port = context.port; 620 file = context.file; 621 path = context.path; 622 isRelative = true; 623 } 624 } 625 626 if (protocol == null) { 627 throw new MalformedURLException("no protocol: "+original); 628 } 629 630 // Get the protocol handler if not specified or the protocol 631 // of the context could not be used 632 if (handler == null && 633 (handler = getURLStreamHandler(protocol)) == null) { 634 throw new MalformedURLException("unknown protocol: "+protocol); 635 } 636 637 this.handler = handler; 638 639 i = spec.indexOf('#', start); 640 if (i >= 0) { 641 ref = spec.substring(i + 1, limit); 642 limit = i; 643 } 644 645 /* 646 * Handle special case inheritance of query and fragment 647 * implied by RFC2396 section 5.2.2. 648 */ 649 if (isRelative && start == limit) { 650 query = context.query; 651 if (ref == null) { 652 ref = context.ref; 653 } 654 } 655 656 handler.parseURL(this, spec, start, limit); 657 658 } catch(MalformedURLException e) { 659 throw e; 660 } catch(Exception e) { 661 MalformedURLException exception = new MalformedURLException(e.getMessage()); 662 exception.initCause(e); 663 throw exception; 664 } 665 } 666 667 /** 668 * Creates a URL from a URI, as if by invoking {@code uri.toURL()}. 669 * 670 * @see java.net.URI#toURL() 671 */ 672 static URL fromURI(URI uri) throws MalformedURLException { 673 if (!uri.isAbsolute()) { 674 throw new IllegalArgumentException("URI is not absolute"); 675 } 676 String protocol = uri.getScheme(); 677 678 // In general we need to go via Handler.parseURL, but for the jrt 679 // protocol we enforce that the Handler is not overrideable and can 680 // optimize URI to URL conversion. 681 // 682 // Case-sensitive comparison for performance; malformed protocols will 683 // be handled correctly by the slow path. 684 if (protocol.equals("jrt") && !uri.isOpaque() 685 && uri.getRawFragment() == null) { 686 687 String query = uri.getRawQuery(); 688 String path = uri.getRawPath(); 689 String file = (query == null) ? path : path + "?" + query; 690 691 // URL represent undefined host as empty string while URI use null 692 String host = uri.getHost(); 693 if (host == null) { 694 host = ""; 695 } 696 697 int port = uri.getPort(); 698 699 return new URL("jrt", host, port, file, null); 700 } else { 701 return new URL((URL)null, uri.toString(), null); 702 } 703 } 704 705 /* 706 * Returns true if specified string is a valid protocol name. 707 */ 708 private boolean isValidProtocol(String protocol) { 709 int len = protocol.length(); 710 if (len < 1) 711 return false; 712 char c = protocol.charAt(0); 713 if (!Character.isLetter(c)) 714 return false; 715 for (int i = 1; i < len; i++) { 716 c = protocol.charAt(i); 717 if (!Character.isLetterOrDigit(c) && c != '.' && c != '+' && 718 c != '-') { 719 return false; 720 } 721 } 722 return true; 723 } 724 725 /* 726 * Checks for permission to specify a stream handler. 727 */ 728 private void checkSpecifyHandler(SecurityManager sm) { 729 sm.checkPermission(SecurityConstants.SPECIFY_HANDLER_PERMISSION); 730 } 731 732 /** 733 * Sets the fields of the URL. This is not a public method so that 734 * only URLStreamHandlers can modify URL fields. URLs are 735 * otherwise constant. 736 * 737 * @param protocol the name of the protocol to use 738 * @param host the name of the host 739 @param port the port number on the host 740 * @param file the file on the host 741 * @param ref the internal reference in the URL 742 */ 743 void set(String protocol, String host, int port, 744 String file, String ref) { 745 synchronized (this) { 746 this.protocol = protocol; 747 this.host = host; 748 authority = port == -1 ? host : host + ":" + port; 749 this.port = port; 750 this.file = file; 751 this.ref = ref; 752 /* This is very important. We must recompute this after the 753 * URL has been changed. */ 754 hashCode = -1; 755 hostAddress = null; 756 int q = file.lastIndexOf('?'); 757 if (q != -1) { 758 query = file.substring(q+1); 759 path = file.substring(0, q); 760 } else 761 path = file; 762 } 763 } 764 765 /** 766 * Sets the specified 8 fields of the URL. This is not a public method so 767 * that only URLStreamHandlers can modify URL fields. URLs are otherwise 768 * constant. 769 * 770 * @param protocol the name of the protocol to use 771 * @param host the name of the host 772 * @param port the port number on the host 773 * @param authority the authority part for the url 774 * @param userInfo the username and password 775 * @param path the file on the host 776 * @param ref the internal reference in the URL 777 * @param query the query part of this URL 778 * @since 1.3 779 */ 780 void set(String protocol, String host, int port, 781 String authority, String userInfo, String path, 782 String query, String ref) { 783 synchronized (this) { 784 this.protocol = protocol; 785 this.host = host; 786 this.port = port; 787 this.file = query == null ? path : path + "?" + query; 788 this.userInfo = userInfo; 789 this.path = path; 790 this.ref = ref; 791 /* This is very important. We must recompute this after the 792 * URL has been changed. */ 793 hashCode = -1; 794 hostAddress = null; 795 this.query = query; 796 this.authority = authority; 797 } 798 } 799 800 /** 801 * Gets the query part of this {@code URL}. 802 * 803 * @return the query part of this {@code URL}, 804 * or <CODE>null</CODE> if one does not exist 805 * @since 1.3 806 */ 807 public String getQuery() { 808 return query; 809 } 810 811 /** 812 * Gets the path part of this {@code URL}. 813 * 814 * @return the path part of this {@code URL}, or an 815 * empty string if one does not exist 816 * @since 1.3 817 */ 818 public String getPath() { 819 return path; 820 } 821 822 /** 823 * Gets the userInfo part of this {@code URL}. 824 * 825 * @return the userInfo part of this {@code URL}, or 826 * <CODE>null</CODE> if one does not exist 827 * @since 1.3 828 */ 829 public String getUserInfo() { 830 return userInfo; 831 } 832 833 /** 834 * Gets the authority part of this {@code URL}. 835 * 836 * @return the authority part of this {@code URL} 837 * @since 1.3 838 */ 839 public String getAuthority() { 840 return authority; 841 } 842 843 /** 844 * Gets the port number of this {@code URL}. 845 * 846 * @return the port number, or -1 if the port is not set 847 */ 848 public int getPort() { 849 return port; 850 } 851 852 /** 853 * Gets the default port number of the protocol associated 854 * with this {@code URL}. If the URL scheme or the URLStreamHandler 855 * for the URL do not define a default port number, 856 * then -1 is returned. 857 * 858 * @return the port number 859 * @since 1.4 860 */ 861 public int getDefaultPort() { 862 return handler.getDefaultPort(); 863 } 864 865 /** 866 * Gets the protocol name of this {@code URL}. 867 * 868 * @return the protocol of this {@code URL}. 869 */ 870 public String getProtocol() { 871 return protocol; 872 } 873 874 /** 875 * Gets the host name of this {@code URL}, if applicable. 876 * The format of the host conforms to RFC 2732, i.e. for a 877 * literal IPv6 address, this method will return the IPv6 address 878 * enclosed in square brackets ({@code '['} and {@code ']'}). 879 * 880 * @return the host name of this {@code URL}. 881 */ 882 public String getHost() { 883 return host; 884 } 885 886 /** 887 * Gets the file name of this {@code URL}. 888 * The returned file portion will be 889 * the same as <CODE>getPath()</CODE>, plus the concatenation of 890 * the value of <CODE>getQuery()</CODE>, if any. If there is 891 * no query portion, this method and <CODE>getPath()</CODE> will 892 * return identical results. 893 * 894 * @return the file name of this {@code URL}, 895 * or an empty string if one does not exist 896 */ 897 public String getFile() { 898 return file; 899 } 900 901 /** 902 * Gets the anchor (also known as the "reference") of this 903 * {@code URL}. 904 * 905 * @return the anchor (also known as the "reference") of this 906 * {@code URL}, or <CODE>null</CODE> if one does not exist 907 */ 908 public String getRef() { 909 return ref; 910 } 911 912 /** 913 * Compares this URL for equality with another object.<p> 914 * 915 * If the given object is not a URL then this method immediately returns 916 * {@code false}.<p> 917 * 918 * Two URL objects are equal if they have the same protocol, reference 919 * equivalent hosts, have the same port number on the host, and the same 920 * file and fragment of the file.<p> 921 * 922 * Two hosts are considered equivalent if both host names can be resolved 923 * into the same IP addresses; else if either host name can't be 924 * resolved, the host names must be equal without regard to case; or both 925 * host names equal to null.<p> 926 * 927 * Since hosts comparison requires name resolution, this operation is a 928 * blocking operation. <p> 929 * 930 * Note: The defined behavior for {@code equals} is known to 931 * be inconsistent with virtual hosting in HTTP. 932 * 933 * @param obj the URL to compare against. 934 * @return {@code true} if the objects are the same; 935 * {@code false} otherwise. 936 */ 937 public boolean equals(Object obj) { 938 if (!(obj instanceof URL)) 939 return false; 940 URL u2 = (URL)obj; 941 942 return handler.equals(this, u2); 943 } 944 945 /** 946 * Creates an integer suitable for hash table indexing.<p> 947 * 948 * The hash code is based upon all the URL components relevant for URL 949 * comparison. As such, this operation is a blocking operation. 950 * 951 * @return a hash code for this {@code URL}. 952 */ 953 public synchronized int hashCode() { 954 if (hashCode != -1) 955 return hashCode; 956 957 hashCode = handler.hashCode(this); 958 return hashCode; 959 } 960 961 /** 962 * Compares two URLs, excluding the fragment component.<p> 963 * 964 * Returns {@code true} if this {@code URL} and the 965 * {@code other} argument are equal without taking the 966 * fragment component into consideration. 967 * 968 * @param other the {@code URL} to compare against. 969 * @return {@code true} if they reference the same remote object; 970 * {@code false} otherwise. 971 */ 972 public boolean sameFile(URL other) { 973 return handler.sameFile(this, other); 974 } 975 976 /** 977 * Constructs a string representation of this {@code URL}. The 978 * string is created by calling the {@code toExternalForm} 979 * method of the stream protocol handler for this object. 980 * 981 * @return a string representation of this object. 982 * @see java.net.URL#URL(java.lang.String, java.lang.String, int, 983 * java.lang.String) 984 * @see java.net.URLStreamHandler#toExternalForm(java.net.URL) 985 */ 986 public String toString() { 987 return toExternalForm(); 988 } 989 990 /** 991 * Constructs a string representation of this {@code URL}. The 992 * string is created by calling the {@code toExternalForm} 993 * method of the stream protocol handler for this object. 994 * 995 * @return a string representation of this object. 996 * @see java.net.URL#URL(java.lang.String, java.lang.String, 997 * int, java.lang.String) 998 * @see java.net.URLStreamHandler#toExternalForm(java.net.URL) 999 */ 1000 public String toExternalForm() { 1001 return handler.toExternalForm(this); 1002 } 1003 1004 /** 1005 * Returns a {@link java.net.URI} equivalent to this URL. 1006 * This method functions in the same way as {@code new URI (this.toString())}. 1007 * <p>Note, any URL instance that complies with RFC 2396 can be converted 1008 * to a URI. However, some URLs that are not strictly in compliance 1009 * can not be converted to a URI. 1010 * 1011 * @exception URISyntaxException if this URL is not formatted strictly according to 1012 * to RFC2396 and cannot be converted to a URI. 1013 * 1014 * @return a URI instance equivalent to this URL. 1015 * @since 1.5 1016 */ 1017 public URI toURI() throws URISyntaxException { 1018 return new URI (toString()); 1019 } 1020 1021 /** 1022 * Returns a {@link java.net.URLConnection URLConnection} instance that 1023 * represents a connection to the remote object referred to by the 1024 * {@code URL}. 1025 * 1026 * <P>A new instance of {@linkplain java.net.URLConnection URLConnection} is 1027 * created every time when invoking the 1028 * {@linkplain java.net.URLStreamHandler#openConnection(URL) 1029 * URLStreamHandler.openConnection(URL)} method of the protocol handler for 1030 * this URL.</P> 1031 * 1032 * <P>It should be noted that a URLConnection instance does not establish 1033 * the actual network connection on creation. This will happen only when 1034 * calling {@linkplain java.net.URLConnection#connect() URLConnection.connect()}.</P> 1035 * 1036 * <P>If for the URL's protocol (such as HTTP or JAR), there 1037 * exists a public, specialized URLConnection subclass belonging 1038 * to one of the following packages or one of their subpackages: 1039 * java.lang, java.io, java.util, java.net, the connection 1040 * returned will be of that subclass. For example, for HTTP an 1041 * HttpURLConnection will be returned, and for JAR a 1042 * JarURLConnection will be returned.</P> 1043 * 1044 * @return a {@link java.net.URLConnection URLConnection} linking 1045 * to the URL. 1046 * @exception IOException if an I/O exception occurs. 1047 * @see java.net.URL#URL(java.lang.String, java.lang.String, 1048 * int, java.lang.String) 1049 */ 1050 public URLConnection openConnection() throws java.io.IOException { 1051 return handler.openConnection(this); 1052 } 1053 1054 /** 1055 * Same as {@link #openConnection()}, except that the connection will be 1056 * made through the specified proxy; Protocol handlers that do not 1057 * support proxing will ignore the proxy parameter and make a 1058 * normal connection. 1059 * 1060 * Invoking this method preempts the system's default 1061 * {@link java.net.ProxySelector ProxySelector} settings. 1062 * 1063 * @param proxy the Proxy through which this connection 1064 * will be made. If direct connection is desired, 1065 * Proxy.NO_PROXY should be specified. 1066 * @return a {@code URLConnection} to the URL. 1067 * @exception IOException if an I/O exception occurs. 1068 * @exception SecurityException if a security manager is present 1069 * and the caller doesn't have permission to connect 1070 * to the proxy. 1071 * @exception IllegalArgumentException will be thrown if proxy is null, 1072 * or proxy has the wrong type 1073 * @exception UnsupportedOperationException if the subclass that 1074 * implements the protocol handler doesn't support 1075 * this method. 1076 * @see java.net.URL#URL(java.lang.String, java.lang.String, 1077 * int, java.lang.String) 1078 * @see java.net.URLConnection 1079 * @see java.net.URLStreamHandler#openConnection(java.net.URL, 1080 * java.net.Proxy) 1081 * @since 1.5 1082 */ 1083 public URLConnection openConnection(Proxy proxy) 1084 throws java.io.IOException { 1085 if (proxy == null) { 1086 throw new IllegalArgumentException("proxy can not be null"); 1087 } 1088 1089 // Create a copy of Proxy as a security measure 1090 Proxy p = proxy == Proxy.NO_PROXY ? Proxy.NO_PROXY : sun.net.ApplicationProxy.create(proxy); 1091 SecurityManager sm = System.getSecurityManager(); 1092 if (p.type() != Proxy.Type.DIRECT && sm != null) { 1093 InetSocketAddress epoint = (InetSocketAddress) p.address(); 1094 if (epoint.isUnresolved()) 1095 sm.checkConnect(epoint.getHostName(), epoint.getPort()); 1096 else 1097 sm.checkConnect(epoint.getAddress().getHostAddress(), 1098 epoint.getPort()); 1099 } 1100 return handler.openConnection(this, p); 1101 } 1102 1103 /** 1104 * Opens a connection to this {@code URL} and returns an 1105 * {@code InputStream} for reading from that connection. This 1106 * method is a shorthand for: 1107 * <blockquote><pre> 1108 * openConnection().getInputStream() 1109 * </pre></blockquote> 1110 * 1111 * @return an input stream for reading from the URL connection. 1112 * @exception IOException if an I/O exception occurs. 1113 * @see java.net.URL#openConnection() 1114 * @see java.net.URLConnection#getInputStream() 1115 */ 1116 public final InputStream openStream() throws java.io.IOException { 1117 return openConnection().getInputStream(); 1118 } 1119 1120 /** 1121 * Gets the contents of this URL. This method is a shorthand for: 1122 * <blockquote><pre> 1123 * openConnection().getContent() 1124 * </pre></blockquote> 1125 * 1126 * @return the contents of this URL. 1127 * @exception IOException if an I/O exception occurs. 1128 * @see java.net.URLConnection#getContent() 1129 */ 1130 public final Object getContent() throws java.io.IOException { 1131 return openConnection().getContent(); 1132 } 1133 1134 /** 1135 * Gets the contents of this URL. This method is a shorthand for: 1136 * <blockquote><pre> 1137 * openConnection().getContent(classes) 1138 * </pre></blockquote> 1139 * 1140 * @param classes an array of Java types 1141 * @return the content object of this URL that is the first match of 1142 * the types specified in the classes array. 1143 * null if none of the requested types are supported. 1144 * @exception IOException if an I/O exception occurs. 1145 * @see java.net.URLConnection#getContent(Class[]) 1146 * @since 1.3 1147 */ 1148 public final Object getContent(Class<?>[] classes) 1149 throws java.io.IOException { 1150 return openConnection().getContent(classes); 1151 } 1152 1153 /** 1154 * The URLStreamHandler factory. 1155 */ 1156 private static volatile URLStreamHandlerFactory factory; 1157 1158 /** 1159 * Sets an application's {@code URLStreamHandlerFactory}. 1160 * This method can be called at most once in a given Java Virtual 1161 * Machine. 1162 * 1163 *<p> The {@code URLStreamHandlerFactory} instance is used to 1164 *construct a stream protocol handler from a protocol name. 1165 * 1166 * <p> If there is a security manager, this method first calls 1167 * the security manager's {@code checkSetFactory} method 1168 * to ensure the operation is allowed. 1169 * This could result in a SecurityException. 1170 * 1171 * @param fac the desired factory. 1172 * @exception Error if the application has already set a factory. 1173 * @exception SecurityException if a security manager exists and its 1174 * {@code checkSetFactory} method doesn't allow 1175 * the operation. 1176 * @see java.net.URL#URL(java.lang.String, java.lang.String, 1177 * int, java.lang.String) 1178 * @see java.net.URLStreamHandlerFactory 1179 * @see SecurityManager#checkSetFactory 1180 */ 1181 public static void setURLStreamHandlerFactory(URLStreamHandlerFactory fac) { 1182 synchronized (streamHandlerLock) { 1183 if (factory != null) { 1184 throw new Error("factory already defined"); 1185 } 1186 SecurityManager security = System.getSecurityManager(); 1187 if (security != null) { 1188 security.checkSetFactory(); 1189 } 1190 handlers.clear(); 1191 1192 // safe publication of URLStreamHandlerFactory with volatile write 1193 factory = fac; 1194 } 1195 } 1196 1197 private static final URLStreamHandlerFactory defaultFactory = new DefaultFactory(); 1198 1199 private static class DefaultFactory implements URLStreamHandlerFactory { 1200 private static String PREFIX = "sun.net.www.protocol"; 1201 1202 public URLStreamHandler createURLStreamHandler(String protocol) { 1203 String name = PREFIX + "." + protocol + ".Handler"; 1204 try { 1205 @SuppressWarnings("deprecation") 1206 Object o = Class.forName(name).newInstance(); 1207 return (URLStreamHandler)o; 1208 } catch (ClassNotFoundException x) { 1209 // ignore 1210 } catch (Exception e) { 1211 // For compatibility, all Exceptions are ignored. 1212 // any number of exceptions can get thrown here 1213 } 1214 return null; 1215 } 1216 } 1217 1218 private static URLStreamHandler lookupViaProperty(String protocol) { 1219 String packagePrefixList = 1220 GetPropertyAction.privilegedGetProperty(protocolPathProp); 1221 if (packagePrefixList == null) { 1222 // not set 1223 return null; 1224 } 1225 1226 String[] packagePrefixes = packagePrefixList.split("\\|"); 1227 URLStreamHandler handler = null; 1228 for (int i=0; handler == null && i<packagePrefixes.length; i++) { 1229 String packagePrefix = packagePrefixes[i].trim(); 1230 try { 1231 String clsName = packagePrefix + "." + protocol + ".Handler"; 1232 Class<?> cls = null; 1233 try { 1234 cls = Class.forName(clsName); 1235 } catch (ClassNotFoundException e) { 1236 ClassLoader cl = ClassLoader.getSystemClassLoader(); 1237 if (cl != null) { 1238 cls = cl.loadClass(clsName); 1239 } 1240 } 1241 if (cls != null) { 1242 @SuppressWarnings("deprecation") 1243 Object tmp = cls.newInstance(); 1244 handler = (URLStreamHandler)tmp; 1245 } 1246 } catch (Exception e) { 1247 // any number of exceptions can get thrown here 1248 } 1249 } 1250 return handler; 1251 } 1252 1253 private static Iterator<URLStreamHandlerProvider> providers() { 1254 return new Iterator<>() { 1255 1256 ClassLoader cl = ClassLoader.getSystemClassLoader(); 1257 ServiceLoader<URLStreamHandlerProvider> sl = 1258 ServiceLoader.load(URLStreamHandlerProvider.class, cl); 1259 Iterator<URLStreamHandlerProvider> i = sl.iterator(); 1260 1261 URLStreamHandlerProvider next = null; 1262 1263 private boolean getNext() { 1264 while (next == null) { 1265 try { 1266 if (!i.hasNext()) 1267 return false; 1268 next = i.next(); 1269 } catch (ServiceConfigurationError sce) { 1270 if (sce.getCause() instanceof SecurityException) { 1271 // Ignore security exceptions 1272 continue; 1273 } 1274 throw sce; 1275 } 1276 } 1277 return true; 1278 } 1279 1280 public boolean hasNext() { 1281 return getNext(); 1282 } 1283 1284 public URLStreamHandlerProvider next() { 1285 if (!getNext()) 1286 throw new NoSuchElementException(); 1287 URLStreamHandlerProvider n = next; 1288 next = null; 1289 return n; 1290 } 1291 }; 1292 } 1293 1294 // Thread-local gate to prevent recursive provider lookups 1295 private static ThreadLocal<Object> gate = new ThreadLocal<>(); 1296 1297 private static URLStreamHandler lookupViaProviders(final String protocol) { 1298 if (gate.get() != null) 1299 throw new Error("Circular loading of URL stream handler providers detected"); 1300 1301 gate.set(gate); 1302 try { 1303 return AccessController.doPrivileged( 1304 new PrivilegedAction<>() { 1305 public URLStreamHandler run() { 1306 Iterator<URLStreamHandlerProvider> itr = providers(); 1307 while (itr.hasNext()) { 1308 URLStreamHandlerProvider f = itr.next(); 1309 URLStreamHandler h = f.createURLStreamHandler(protocol); 1310 if (h != null) 1311 return h; 1312 } 1313 return null; 1314 } 1315 }); 1316 } finally { 1317 gate.set(null); 1318 } 1319 } 1320 1321 /** 1322 * Returns the protocol in lower case. Special cases known protocols 1323 * to avoid loading locale classes during startup. 1324 */ 1325 static String toLowerCase(String protocol) { 1326 if (protocol.equals("jrt") || protocol.equals("file") || protocol.equals("jar")) { 1327 return protocol; 1328 } else { 1329 return protocol.toLowerCase(Locale.ROOT); 1330 } 1331 } 1332 1333 /** 1334 * Non-overrideable protocols: "jrt" and "file" 1335 * 1336 * Character-based comparison for performance reasons; also ensures 1337 * case-insensitive comparison in a locale-independent fashion. 1338 */ 1339 static boolean isOverrideable(String protocol) { 1340 if (protocol.length() == 3) { 1341 if ((Character.toLowerCase(protocol.charAt(0)) == 'j') && 1342 (Character.toLowerCase(protocol.charAt(1)) == 'r') && 1343 (Character.toLowerCase(protocol.charAt(2)) == 't')) { 1344 return false; 1345 } 1346 } else if (protocol.length() == 4) { 1347 if ((Character.toLowerCase(protocol.charAt(0)) == 'f') && 1348 (Character.toLowerCase(protocol.charAt(1)) == 'i') && 1349 (Character.toLowerCase(protocol.charAt(2)) == 'l') && 1350 (Character.toLowerCase(protocol.charAt(3)) == 'e')) { 1351 return false; 1352 } 1353 } 1354 return true; 1355 } 1356 1357 /** 1358 * A table of protocol handlers. 1359 */ 1360 static Hashtable<String,URLStreamHandler> handlers = new Hashtable<>(); 1361 private static final Object streamHandlerLock = new Object(); 1362 1363 /** 1364 * Returns the Stream Handler. 1365 * @param protocol the protocol to use 1366 */ 1367 static URLStreamHandler getURLStreamHandler(String protocol) { 1368 1369 URLStreamHandler handler = handlers.get(protocol); 1370 1371 if (handler != null) { 1372 return handler; 1373 } 1374 1375 URLStreamHandlerFactory fac; 1376 boolean checkedWithFactory = false; 1377 1378 if (isOverrideable(protocol) && jdk.internal.misc.VM.isBooted()) { 1379 // Use the factory (if any). Volatile read makes 1380 // URLStreamHandlerFactory appear fully initialized to current thread. 1381 fac = factory; 1382 if (fac != null) { 1383 handler = fac.createURLStreamHandler(protocol); 1384 checkedWithFactory = true; 1385 } 1386 1387 if (handler == null && !protocol.equalsIgnoreCase("jar")) { 1388 handler = lookupViaProviders(protocol); 1389 } 1390 1391 if (handler == null) { 1392 handler = lookupViaProperty(protocol); 1393 } 1394 } 1395 1396 synchronized (streamHandlerLock) { 1397 if (handler == null) { 1398 // Try the built-in protocol handler 1399 handler = defaultFactory.createURLStreamHandler(protocol); 1400 } else { 1401 URLStreamHandler handler2 = null; 1402 1403 // Check again with hashtable just in case another 1404 // thread created a handler since we last checked 1405 handler2 = handlers.get(protocol); 1406 1407 if (handler2 != null) { 1408 return handler2; 1409 } 1410 1411 // Check with factory if another thread set a 1412 // factory since our last check 1413 if (!checkedWithFactory && (fac = factory) != null) { 1414 handler2 = fac.createURLStreamHandler(protocol); 1415 } 1416 1417 if (handler2 != null) { 1418 // The handler from the factory must be given more 1419 // importance. Discard the default handler that 1420 // this thread created. 1421 handler = handler2; 1422 } 1423 } 1424 1425 // Insert this handler into the hashtable 1426 if (handler != null) { 1427 handlers.put(protocol, handler); 1428 } 1429 } 1430 1431 return handler; 1432 } 1433 1434 /** 1435 * @serialField protocol String 1436 * 1437 * @serialField host String 1438 * 1439 * @serialField port int 1440 * 1441 * @serialField authority String 1442 * 1443 * @serialField file String 1444 * 1445 * @serialField ref String 1446 * 1447 * @serialField hashCode int 1448 * 1449 */ 1450 private static final ObjectStreamField[] serialPersistentFields = { 1451 new ObjectStreamField("protocol", String.class), 1452 new ObjectStreamField("host", String.class), 1453 new ObjectStreamField("port", int.class), 1454 new ObjectStreamField("authority", String.class), 1455 new ObjectStreamField("file", String.class), 1456 new ObjectStreamField("ref", String.class), 1457 new ObjectStreamField("hashCode", int.class), }; 1458 1459 /** 1460 * WriteObject is called to save the state of the URL to an 1461 * ObjectOutputStream. The handler is not saved since it is 1462 * specific to this system. 1463 * 1464 * @serialData the default write object value. When read back in, 1465 * the reader must ensure that calling getURLStreamHandler with 1466 * the protocol variable returns a valid URLStreamHandler and 1467 * throw an IOException if it does not. 1468 */ 1469 private synchronized void writeObject(java.io.ObjectOutputStream s) 1470 throws IOException 1471 { 1472 s.defaultWriteObject(); // write the fields 1473 } 1474 1475 /** 1476 * readObject is called to restore the state of the URL from the 1477 * stream. It reads the components of the URL and finds the local 1478 * stream handler. 1479 */ 1480 private synchronized void readObject(java.io.ObjectInputStream s) 1481 throws IOException, ClassNotFoundException { 1482 GetField gf = s.readFields(); 1483 String protocol = (String)gf.get("protocol", null); 1484 if (getURLStreamHandler(protocol) == null) { 1485 throw new IOException("unknown protocol: " + protocol); 1486 } 1487 String host = (String)gf.get("host", null); 1488 int port = gf.get("port", -1); 1489 String authority = (String)gf.get("authority", null); 1490 String file = (String)gf.get("file", null); 1491 String ref = (String)gf.get("ref", null); 1492 int hashCode = gf.get("hashCode", -1); 1493 if (authority == null 1494 && ((host != null && host.length() > 0) || port != -1)) { 1495 if (host == null) 1496 host = ""; 1497 authority = (port == -1) ? host : host + ":" + port; 1498 } 1499 tempState = new UrlDeserializedState(protocol, host, port, authority, 1500 file, ref, hashCode); 1501 } 1502 1503 /** 1504 * Replaces the de-serialized object with an URL object. 1505 * 1506 * @return a newly created object from deserialized data 1507 * 1508 * @throws ObjectStreamException if a new object replacing this 1509 * object could not be created 1510 */ 1511 1512 private Object readResolve() throws ObjectStreamException { 1513 1514 URLStreamHandler handler = null; 1515 // already been checked in readObject 1516 handler = getURLStreamHandler(tempState.getProtocol()); 1517 1518 URL replacementURL = null; 1519 if (isBuiltinStreamHandler(handler.getClass().getName())) { 1520 replacementURL = fabricateNewURL(); 1521 } else { 1522 replacementURL = setDeserializedFields(handler); 1523 } 1524 return replacementURL; 1525 } 1526 1527 private URL setDeserializedFields(URLStreamHandler handler) { 1528 URL replacementURL; 1529 String userInfo = null; 1530 String protocol = tempState.getProtocol(); 1531 String host = tempState.getHost(); 1532 int port = tempState.getPort(); 1533 String authority = tempState.getAuthority(); 1534 String file = tempState.getFile(); 1535 String ref = tempState.getRef(); 1536 int hashCode = tempState.getHashCode(); 1537 1538 1539 // Construct authority part 1540 if (authority == null 1541 && ((host != null && host.length() > 0) || port != -1)) { 1542 if (host == null) 1543 host = ""; 1544 authority = (port == -1) ? host : host + ":" + port; 1545 1546 // Handle hosts with userInfo in them 1547 int at = host.lastIndexOf('@'); 1548 if (at != -1) { 1549 userInfo = host.substring(0, at); 1550 host = host.substring(at+1); 1551 } 1552 } else if (authority != null) { 1553 // Construct user info part 1554 int ind = authority.indexOf('@'); 1555 if (ind != -1) 1556 userInfo = authority.substring(0, ind); 1557 } 1558 1559 // Construct path and query part 1560 String path = null; 1561 String query = null; 1562 if (file != null) { 1563 // Fix: only do this if hierarchical? 1564 int q = file.lastIndexOf('?'); 1565 if (q != -1) { 1566 query = file.substring(q+1); 1567 path = file.substring(0, q); 1568 } else 1569 path = file; 1570 } 1571 1572 // Set the object fields. 1573 this.protocol = protocol; 1574 this.host = host; 1575 this.port = port; 1576 this.file = file; 1577 this.authority = authority; 1578 this.ref = ref; 1579 this.hashCode = hashCode; 1580 this.handler = handler; 1581 this.query = query; 1582 this.path = path; 1583 this.userInfo = userInfo; 1584 replacementURL = this; 1585 return replacementURL; 1586 } 1587 1588 private URL fabricateNewURL() 1589 throws InvalidObjectException { 1590 // create URL string from deserialized object 1591 URL replacementURL = null; 1592 String urlString = tempState.reconstituteUrlString(); 1593 1594 try { 1595 replacementURL = new URL(urlString); 1596 } catch (MalformedURLException mEx) { 1597 resetState(); 1598 InvalidObjectException invoEx = new InvalidObjectException( 1599 "Malformed URL: " + urlString); 1600 invoEx.initCause(mEx); 1601 throw invoEx; 1602 } 1603 replacementURL.setSerializedHashCode(tempState.getHashCode()); 1604 resetState(); 1605 return replacementURL; 1606 } 1607 1608 private boolean isBuiltinStreamHandler(String handlerClassName) { 1609 return (handlerClassName.startsWith(BUILTIN_HANDLERS_PREFIX)); 1610 } 1611 1612 private void resetState() { 1613 this.protocol = null; 1614 this.host = null; 1615 this.port = -1; 1616 this.file = null; 1617 this.authority = null; 1618 this.ref = null; 1619 this.hashCode = -1; 1620 this.handler = null; 1621 this.query = null; 1622 this.path = null; 1623 this.userInfo = null; 1624 this.tempState = null; 1625 } 1626 1627 private void setSerializedHashCode(int hc) { 1628 this.hashCode = hc; 1629 } 1630 1631 static { 1632 SharedSecrets.setJavaNetURLAccess( 1633 new JavaNetURLAccess() { 1634 @Override 1635 public URLStreamHandler getHandler(URL u) { 1636 return u.handler; 1637 } 1638 } 1639 ); 1640 } 1641} 1642 1643final class UrlDeserializedState { 1644 private final String protocol; 1645 private final String host; 1646 private final int port; 1647 private final String authority; 1648 private final String file; 1649 private final String ref; 1650 private final int hashCode; 1651 1652 public UrlDeserializedState(String protocol, 1653 String host, int port, 1654 String authority, String file, 1655 String ref, int hashCode) { 1656 this.protocol = protocol; 1657 this.host = host; 1658 this.port = port; 1659 this.authority = authority; 1660 this.file = file; 1661 this.ref = ref; 1662 this.hashCode = hashCode; 1663 } 1664 1665 String getProtocol() { 1666 return protocol; 1667 } 1668 1669 String getHost() { 1670 return host; 1671 } 1672 1673 String getAuthority () { 1674 return authority; 1675 } 1676 1677 int getPort() { 1678 return port; 1679 } 1680 1681 String getFile () { 1682 return file; 1683 } 1684 1685 String getRef () { 1686 return ref; 1687 } 1688 1689 int getHashCode () { 1690 return hashCode; 1691 } 1692 1693 String reconstituteUrlString() { 1694 1695 // pre-compute length of StringBuffer 1696 int len = protocol.length() + 1; 1697 if (authority != null && authority.length() > 0) 1698 len += 2 + authority.length(); 1699 if (file != null) { 1700 len += file.length(); 1701 } 1702 if (ref != null) 1703 len += 1 + ref.length(); 1704 StringBuilder result = new StringBuilder(len); 1705 result.append(protocol); 1706 result.append(":"); 1707 if (authority != null && authority.length() > 0) { 1708 result.append("//"); 1709 result.append(authority); 1710 } 1711 if (file != null) { 1712 result.append(file); 1713 } 1714 if (ref != null) { 1715 result.append("#"); 1716 result.append(ref); 1717 } 1718 return result.toString(); 1719 } 1720} 1721