使用 jar protocol 直接讀取 zip file

import java.io.InputStream;
import java.net.URL;

import org.apache.commons.io.IOUtils;

public class Main {

  public static void main(String[] args) throws Exception {
    // C:/jdk1.6/src.zip
    URL url = new URL("jar:file:C:/jdk1.6/src.zip!/java/lang/String.java");
    InputStream is = url.openStream();
    try {
      IOUtils.copy(is, System.out);     
    } finally {
      is.close();
    }
  }

}