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POHow do you make a function that will create a .jar file in Java?
 

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  1. POHow do you make a function that will create a .jar file in Java?
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    <p>I've made some code in Java that will change some files in another .jar file, and I know that the unpacking/changing works, but the repacking doesn't. It does succeed, but when I compare the new one and the original (I removed the code that changed the files), they differed. What's interesting is that when I extracted them both into different directories, and I runned <code>diff -rqy</code> on them both, it didn't show any difference.</p> <p>Here is the current function:</p> <pre><code>public static void add(File source, JarOutputStream target, String removeme) throws IOException { BufferedInputStream in = null; try { File source2 = new File(source.getPath().replaceAll("^" + removeme, "")); // File source2 = source; if (source.isDirectory()) { String name = source2.getPath().replace("\\", "/"); if (!name.isEmpty()) { if (!name.endsWith("/")) name += "/"; JarEntry entry = new JarEntry(name); entry.setTime(source.lastModified()); target.putNextEntry(entry); target.closeEntry(); } for (File nestedFile : source.listFiles()) add(nestedFile, target, removeme); return; } JarEntry entry = new JarEntry(source2.getPath().replace("\\", "/")); entry.setTime(source.lastModified()); target.putNextEntry(entry); in = new BufferedInputStream(new FileInputStream(source)); byte[] buffer = new byte[2048]; while (true) { int count = in.read(buffer); if (count == -1) break; target.write(buffer, 0, count); } target.closeEntry(); } finally { if (in != null) in.close(); } } </code></pre> <p>I call it like this:</p> <pre><code>JarOutputStream zip = new JarOutputStream( new FileOutputStream(JARFILE)); for (File nestedFile : new File(DIRECTORY).listFiles()) { Utils.add(nestedFile, zip, new File(DIRECTORY).getAbsolutePath()); } zip.close(); </code></pre> <p>Can anyone direct me on what to change in the function, or what other function I should use? The directory has subdirectories, so I need a function that will scan them.</p> <p>Thanks in advance!</p> <p>Edit: I don't want something using the <code>jar</code> command, because I don't want the user to need to install the JDK. I want something using pure Java (libraries are OK, as long as I can include them in the program).</p> <p>Edit 2: I'm making a Minecraft modder (like MCPatcher and ModLoader), but when I run <code>java -jar minecraft.jar</code>, it gives me this: <code>Invalid or corrupt jarfile</code>. The correct .jar doesn't give this (just a main class error, which is supposed to happen).</p>
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    1. USMiJyn
    1. USMiJyn
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    1. CO*How* are they different? And are they different in a meaningful way?
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      1. POHow do you make a function that will create a .jar file in Java?
      1. USDave Newton
    2. COI have no idea. All that I can know of interest is a bunch of machine code from running `diff -a` on both lol.
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      1. POHow do you make a function that will create a .jar file in Java?
      1. USMiJyn
    3. COThen how do you know what you're doing isn't working?
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      1. POHow do you make a function that will create a .jar file in Java?
      1. USDave Newton
 

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