http://ja.stackoverflow.com/questions/20197/

Main.java

package com.github.yukihane.jar;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.jar.JarEntry;
import java.util.jar.JarInputStream;
import java.util.jar.JarOutputStream;

public class Main {

    public static void main(String[] args) throws IOException, ClassNotFoundException {
        Main main = new Main();
        Asset target = new Asset(new Resource1("my resource"), new Resource2(2016));
        File jar = new File("asset.jar");

        main.compress(jar, target);
        Asset result = main.decompress(jar);
        System.out.println("res1: " + result.res1.name + ", res2: " + result.res2.year);
    }

    void compress(File jar, Asset target) throws IOException {
        try (JarOutputStream jos = new JarOutputStream(new FileOutputStream(jar))) {
            JarEntry ze = new JarEntry("asset");
            jos.putNextEntry(ze);
            try (ObjectOutputStream os = new ObjectOutputStream(jos)) {
                os.writeObject(target);
            }
        }
    }

    Asset decompress(File jar) throws IOException, ClassNotFoundException {
        try (JarInputStream jis = new JarInputStream(new FileInputStream(jar))) {
            jis.getNextJarEntry();
            try (ObjectInputStream is = new ObjectInputStream(jis)) {
                return (Asset) is.readObject();
            }
        }
    }
}

class Asset implements Serializable {
    Resource1 res1;
    Resource2 res2;

    public Asset(Resource1 res1, Resource2 res2) {
        this.res1 = res1;
        this.res2 = res2;
    }
}

class Resource1 implements Serializable {
    String name;

    Resource1(String name) {
        this.name = name;
    }
}

class Resource2 implements Serializable {
    int year;

    Resource2(int length) {
        this.year = length;
    }
}