Java Tutorial/File/JarOutputStream

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Create JarOutputStream from FileOutputStream

   <source lang="java">

import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.InputStream; import java.util.jar.JarOutputStream; import java.util.jar.Pack200; import java.util.zip.GZIPInputStream; public class MainClass {

 public static void main(String[] args) throws Exception {
   String inName = args[0];
   String outName;
   if (inName.endsWith(".pack.gz")) {
     outName = inName.substring(0, inName.length() - 8);
   } else if (inName.endsWith(".pack")) {
     outName = inName.substring(0, inName.length() - 5);
   } else {
     outName = inName + ".unpacked";
   }
   JarOutputStream out = null;
   InputStream in = null;
   Pack200.Unpacker unpacker = Pack200.newUnpacker();
   out = new JarOutputStream(new FileOutputStream(outName));
   in = new FileInputStream(inName);
   if (inName.endsWith(".gz"))
     in = new GZIPInputStream(in);
   unpacker.unpack(in, out);
   out.close();
 }

}</source>