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POHow can I search .class file in jar file on the fly?
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copied!<p>I have a URL list of jar files, also I have whole path classname like <code>com.mycompany.myproject.Test</code>, how can I search in these jar files and get the .class file in it? I use it for decompiling. </p> <pre><code>String classname = "com.mycompany.myproject.Test"; URI uri = Tool.searchClass(jarList, classname); // decompile .class ... </code></pre> <p>Any sample codes like this?</p> <p><strong>Add: Shell script is good, but is there a way in java code can do this job?</strong></p> <p><strong>Add: I just wrote a static method by using <code>java.util.jar.JarFile</code> to handle this, hope this helps other people</strong></p> <p>The following code is tested and works properly:</p> <pre><code>/** * Search the class by classname specified in jarFile, if found and destFolder specified * Copy the .class file into destFolder with whole path. * @param classname * @param jarFile * @param destFolder * @return */ public static File searchCompressedFile(String classname, File jarFile, String destFolder) { try { // change classname "." to "/" if(classname.contains(".")){ classname = classname.replace(".", "/"); } JarFile jarF = new JarFile(jarFile); Enumeration<JarEntry> jarEntries = jarF.entries(); while (jarEntries.hasMoreElements()) { JarEntry jarEntry = jarEntries.nextElement(); if (jarEntry.getName().indexOf(classname) >= 0) { String filePath = jarFile.getAbsolutePath(); System.out.println(classname + " is in " + filePath + "--" + jarEntry.getName()); if (destFolder != null && !"".equals(destFolder)) { // Make folder if dest folder not existed. File destF = new File(destFolder); if (!destF.exists()) { destF.mkdirs(); } File f = new File(destFolder + File.separator + jarEntry.getName()); if(!f.getParentFile().exists()){ f.getParentFile().mkdirs(); } InputStream is = jarF.getInputStream(jarEntry); FileOutputStream fos = new java.io.FileOutputStream(f); while (is.available() > 0) { fos.write(is.read()); } fos.close(); is.close(); return f; } } } } catch (IOException e) { e.printStackTrace(); } System.out.println("Class not found in jar"); return null; } </code></pre>

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