Java实现zip解压缩目录中的所有文件

import java.io.*;
import java.util.*;
import java.util.zip.*;
public class FolderUnzip {
private static String sourcepath="D:\\tmp";
private static ListfolderList=new ArrayList(Arrays.asList(sourcepath));
private static ListfolderList2=new ArrayList(Arrays.asList("E:\\tt"+File.separator+sourcepath.substring(sourcepath.lastIndexOf(File.separator))));
private static FileInputStream fis = null;
private static FileOutputStream fos = null;
private static ZipInputStream zipin = null;
    public static void main(String[] args) {
        for (int j = 0; j