Create Jar file : Jar File « File Input Output « Java

Create Jar file

import java.util.jar.JarEntry;
import java.util.jar.JarOutputStream;
import java.util.jar.Manifest;

public class CreateJarFile {
  public static int BUFFER_SIZE = 10240;
  protected void createJarArchive(File archiveFile, File[] tobeJared) {
    try {
      byte buffer[] = new byte[BUFFER_SIZE];
      // Open archive file
      FileOutputStream stream = new FileOutputStream(archiveFile);
      JarOutputStream out = new JarOutputStream(stream, new Manifest());

      for (int i = 0; i < tobeJared.length; i++) {
        if (tobeJared[i] == null || !tobeJared[i].exists()
            || tobeJared[i].isDirectory())
          continue; // Just in case...
        System.out.println("Adding " + tobeJared[i].getName());

        // Add archive entry
        JarEntry jarAdd = new JarEntry(tobeJared[i].getName());

        // Write file to archive
        FileInputStream in = new FileInputStream(tobeJared[i]);
        while (true) {
          int nRead =, 0, buffer.length);
          if (nRead <= 0)
          out.write(buffer, 0, nRead);

      System.out.println("Adding completed OK");
    } catch (Exception ex) {
      System.out.println("Error: " + ex.getMessage());

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