如何用java压缩文件或者目录

package com.cyb.util;

import java.io.BufferedInputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.util.zip.CRC32;

import java.util.zip.CheckedOutputStream;

import java.util.zip.ZipEntry;

import java.util.zip.ZipOutputStream;

public class ZipCompressor {

 static final int BUFFER = 8192;

 private File zipFile;

 public ZipCompressor(String pathName) {

  zipFile = new File(pathName);

 }

 public void compress(String srcPathName) {

  File file = new File(srcPathName);

  if (!file.exists())

   System.out.println(srcPathName + "不存在！");

  try {

   FileOutputStream fileOutputStream = new FileOutputStream(zipFile);

   CheckedOutputStream cos = new CheckedOutputStream(fileOutputStream, new CRC32());

   ZipOutputStream out = new ZipOutputStream(cos);

   String basedir = "";

   compress(file, out, basedir);

   out.close();

  } catch (Exception e) {

   throw new RuntimeException(e);

  }

 }

 private void compress(File file, ZipOutputStream out, String basedir) {

  /* 判断是目录还是文件 */

  if (file.isDirectory()) {

   System.out.println("压缩：" + basedir + file.getName());

   this.compressDirectory(file, out, basedir);

  } else {

   System.out.println("压缩：" + basedir + file.getName());

   this.compressFile(file, out, basedir);

  }

 }

 /** 压缩一个目录 */

 private void compressDirectory(File dir, ZipOutputStream out, String basedir) {

  if (!dir.exists())

   return;

  File[] files = dir.listFiles();

  for (int i = 0; i < files.length; i++) {

   /* 递归 */

   compress(files[i], out, basedir + dir.getName() + "\\");

  }

 }

 /** 压缩一个文件 */

 private void compressFile(File file, ZipOutputStream out, String basedir) {

  if (!file.exists()) {

   return;

  }

  try {

   BufferedInputStream bis = new BufferedInputStream(

     new FileInputStream(file));

   ZipEntry entry = new ZipEntry(basedir + file.getName());

   out.putNextEntry(entry);

   int count;

   byte data[] = new byte[BUFFER];

   while ((count = bis.read(data, 0, BUFFER)) != -1) {

    out.write(data, 0, count);

   }

   bis.close();

  } catch (Exception e) {

   throw new RuntimeException(e);

  }

 }

 public static void main(String[] args) {

  ZipCompressor a = new ZipCompressor("d:/test.zip");

  a.compress("d:\\1.png");

 }

}