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How to get a file from jar?
public class Test {
    public static void main(String[] args) {
        InputStream stream = Test.class.getResourceAsStream("/test.txt");
        Scanner s = new Scanner(stream);
        while (s.hasNext()) {
            System.out.println(s.next());
        }
    }
}

import java.io.*;
import java.util.zip.*;

public class UnZip {
   final int BUFFER = 2048;
   public static void main (String argv[]) {
      try {
         BufferedOutputStream dest = null;
         FileInputStream fis = new FileInputStream(argv[0]);
         ZipInputStream zis = new ZipInputStream(new BufferedInputStream(fis));
         ZipEntry entry;
         while((entry = zis.getNextEntry()) != null) {
            System.out.println("Extracting: " +entry);
            int count;
            byte data[] = new byte[BUFFER];
            // write the files to the disk
            FileOutputStream fos = new FileOutputStream(entry.getName());
            dest = new BufferedOutputStream(fos, BUFFER);
            while ((count = zis.read(data, 0, BUFFER)) != -1) {
               dest.write(data, 0, count);
            }
            dest.flush();
            dest.close();
         }
         zis.close();
      } catch(Exception e) {
         e.printStackTrace();
      }
   }
}

private String getFile(File jar, String requestedFile) throws IOException{
    ByteArrayOutputStream out = new ByteArrayOutputStream(); //change ouptut stream as required
    ZipInputStream in = null;
    try {
        in = new ZipInputStream(new FileInputStream(jar));
        ZipEntry entry;
        while((entry  = in.getNextEntry())!=null){
            if (entry.getName().equals(requestedFile)){

                byte[] buf = new byte[1024];
                int len;
                while ((len = in.read(buf)) > 0) {
                    out.write(buf, 0, len);
                }
            }
        }
    } finally {
        if (in!=null){
            in.close();
        }
        out.close();

    }
    return new String(out.toByteArray());
}

META-INF/MANIFEST.MF
images/pic.gif
files/abc.txt
files/xxx.txt

jar xf yyy.jar files/xxx.txt