1/* 2 * Copyright (c) 2015, 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. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24import java.io.IOException; 25import java.io.OutputStream; 26import java.nio.file.Files; 27import java.nio.file.Paths; 28import java.util.ArrayList; 29import java.util.List; 30import java.util.jar.Attributes; 31import java.util.jar.JarEntry; 32import java.util.jar.JarOutputStream; 33import java.util.jar.Manifest; 34 35public class JarBuilder { 36 final private String name; 37 final private Attributes attributes = new Attributes(); 38 final private List<Entry> entries = new ArrayList<>(); 39 40 public JarBuilder(String name) { 41 this.name = name; 42 attributes.putValue("Manifest-Version", "1.0"); 43 attributes.putValue("Created-By", "1.9.0-internal (Oracle Corporation)"); 44 } 45 46 public JarBuilder addAttribute(String name, String value) { 47 attributes.putValue(name, value); 48 return this; 49 } 50 51 public JarBuilder addEntry(String name, byte[] bytes) { 52 entries.add(new Entry(name, bytes)); 53 return this; 54 } 55 56 public void build() throws IOException { 57 try (OutputStream os = Files.newOutputStream(Paths.get(name)); 58 JarOutputStream jos = new JarOutputStream(os)) { 59 JarEntry me = new JarEntry("META-INF/MANIFEST.MF"); 60 jos.putNextEntry(me); 61 Manifest manifest = new Manifest(); 62 manifest.getMainAttributes().putAll(attributes); 63 manifest.write(jos); 64 jos.closeEntry(); 65 entries.forEach(e -> { 66 JarEntry je = new JarEntry(e.name); 67 try { 68 jos.putNextEntry(je); 69 jos.write(e.bytes); 70 jos.closeEntry(); 71 } catch (IOException iox) { 72 throw new RuntimeException(iox); 73 } 74 }); 75 } catch (RuntimeException x) { 76 Throwable t = x.getCause(); 77 if (t instanceof IOException) { 78 IOException iox = (IOException)t; 79 throw iox; 80 } 81 throw x; 82 } 83 } 84 85 private static class Entry { 86 String name; 87 byte[] bytes; 88 89 Entry(String name, byte[] bytes) { 90 this.name = name; 91 this.bytes = bytes; 92 } 93 } 94 95 public static void main(String[] args) throws IOException { 96 JarBuilder jb = new JarBuilder("version.jar"); 97 jb.addAttribute("Multi-Release", "true"); 98 String s = "something to say"; 99 byte[] bytes = s.getBytes(); 100 jb.addEntry("version/Version.class", bytes); 101 jb.addEntry("README", bytes); 102 jb.addEntry("version/Version.java", bytes); 103 jb.build(); 104 } 105} 106