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 List<String>folderList=new ArrayList<String>(Arrays.asList(sourcepath));  private static List<String>folderList2=new ArrayList<String>(Arrays.asList("E:\\tt"+File.separator+sourcepath.substring(sourcepath.lastIndexOf(File.separator))));  private static FileInputStream fis = null;  private static FileOutputStream fos = null;  private static ZipOutputStream zipOut = null;   public static void main(String[] args) {    for (int j = 0; j < folderList.size(); j++) {     new File(folderList2.get(j)).mkdirs();     String[] file = new File(folderList.get(j)).list();     File temp = null;     for (int i = 0; i < file.length; i++) {      if (folderList.get(j).endsWith(File.separator))       temp = new File(folderList.get(j), file[i]);      else       temp = new File(folderList.get(j), file[i]);      File originalFile = null;      if (temp.getName().endsWith(".zip"))       originalFile = new File(folderList2.get(j), temp.getName()         .substring(0, temp.getName().lastIndexOf('.')));      if (temp.isFile() && !originalFile.exists()) {       try {        fis = new FileInputStream(temp);        zipin = new ZipInputStream(fis);     ZipEntry entry = zipin.getNextEntry();     fos = new FileOutputStream(new File(folderList2.get(j),entry.getName()));        byte[] buffer = new byte[20480];        int nNumber;        while ((nNumber = zipin.read(buffer, 0, buffer.length)) != -1)         fos.write(buffer, 0, nNumber);        fos.flush();       } catch (IOException e) {        continue;       } finally {        try {         zipin.close();         fos.close();         fis.close();        } catch (IOException e) {        }       }      } else if (temp.isDirectory()) {       folderList.add(folderList.get(j) + File.separator + file[i]);       folderList2.add(folderList2.get(j) + File.separator+ file[i]);      }     }    }   }  }