java实现zip压缩

package org;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;

public class Zip {
 
 public static void zip(String zipFileName, String inputFile)
   throws Exception {
  File f = new File(inputFile);
  ZipOutputStream out = new ZipOutputStream(new FileOutputStream(
    zipFileName));
  zip(out, f, null);
  System.out.println("zip done");
  out.close();
 }

 private static void zip(ZipOutputStream out, File f, String base)
   throws Exception {
  System.out.println("zipping " + f.getAbsolutePath());
  if (f != null && f.isDirectory()) {
   File[] fc = f.listFiles();
   if (base != null)
    out.putNextEntry(new ZipEntry(base + "/"));
   base = base == null ? "" : base + "/";
   for (int i = 0; i < fc.length; i++) {
    zip(out, fc[i], base + fc[i].getName());
   }
  } else {
   out.putNextEntry(new ZipEntry(base));
   FileInputStream in = new FileInputStream(f);
   int b;
   while ((b = in.read()) != -1)
    out.write(b);
   in.close();
  }
 }

 
 public static void unzip(String zipFileName, String outputDirectory)
   throws Exception {
  ZipInputStream in = new ZipInputStream(new FileInputStream(zipFileName));
  ZipEntry z;
  while ((z = in.getNextEntry()) != null) {
   String name = z.getName();
   if (z.isDirectory()) {
    name = name.substring(0, name.length() - 1);
    File f = new File(outputDirectory + File.separator + name);
    f.mkdir();
    System.out.println("MD " + outputDirectory + File.separator
      + name);
   } else {
    System.out.println("unziping " + z.getName());
    File f = new File(outputDirectory + File.separator + name);
    f.createNewFile();
    FileOutputStream out = new FileOutputStream(f);
    int b;
    while ((b = in.read()) != -1)
     out.write(b);
    out.close();
   }
  }
  in.close();
 }

 public void deleteFolder(File dir) {
  File filelist[] = dir.listFiles();
  int listlen = filelist.length;
  for (int i = 0; i < listlen; i++) {
   if (filelist[i].isDirectory()) {
    deleteFolder(filelist[i]);
   } else {
    filelist[i].delete();
   }
  }
  dir.delete();
 }

 /**
  * Test ZIP/UNZIP
  * @param args
  */
 public static void main(String[] args) {
  try {
    Zip t = new Zip();
      t.zip("c:\\test.zip","c:\\test");  //在c盘要自己提前建立test文件夹
//    t.unzip("c:\\test.zip","c:\\test");
    File file = new File("c:\\test");
    t.deleteFolder(file);
  } catch (Exception e) {
   e.printStackTrace(System.out);
  }
 }
}