不借助于其他的第三方组件，直接使用java提供的方法通过IO流操作zip文件。

代码如下:

package com.zip;import java.io.File;
import java.io.BufferedOutputStream;
import java.io.BufferedInputStream;
import java.io.FileOutputStream;
import java.io.FileInputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;
/*** 该类实现文件夹压缩成zip文件和zip文件解压* @author Administrator**/
public class Zip{ private ZipInputStream  zipIn;      //解压Zip private ZipOutputStream zipOut;     //压缩Zip private ZipEntry        zipEntry; private static int      bufSize;    //size of bytes private byte[]          buf; private int             readedBytes; public Zip(){ this(512); } public Zip(int bufSize){ this.bufSize = bufSize; this.buf = new byte[this.bufSize]; } //压缩文件夹内的文件 public void doZip(String zipDirectory){//zipDirectoryPath:需要压缩的文件夹名 File file; File zipDir; zipDir = new File(zipDirectory); String zipFileName = zipDirectory + ".zip";//压缩后生成的zip文件名 try{ this.zipOut = new ZipOutputStream(new BufferedOutputStream(new FileOutputStream(zipFileName))); handleDir(zipDir , this.zipOut); this.zipOut.close(); }catch(Exception ioe){ ioe.printStackTrace(); } } //由doZip调用,递归完成目录文件读取private void handleDir(File dir , ZipOutputStream zipOut)throws Exception{ FileInputStream fileIn; File[] files; files = dir.listFiles(); if(files.length == 0){//如果目录为空,则单独创建之. //ZipEntry的isDirectory()方法中,目录以"/"结尾. this.zipOut.putNextEntry(new ZipEntry(dir.toString() + "/")); this.zipOut.closeEntry(); } else{//如果目录不为空,则分别处理目录和文件. for(File fileName : files){ if(fileName.isDirectory()){ handleDir(fileName , this.zipOut); } else{ fileIn = new FileInputStream(fileName);String name=dir.getName();//生成的压缩包存放在原目录下this.zipOut.putNextEntry(new ZipEntry(name+"/"+fileName.getName().toString()));//此方法存放在该项目目录下//this.zipOut.putNextEntry(new ZipEntry(fileName.toString()));while((this.readedBytes=fileIn.read(this.buf))>0){this.zipOut.write(this.buf , 0 , this.readedBytes);}this.zipOut.closeEntry(); } } } } //解压指定zip文件 public void unZip(String unZipfileName){//unZipfileName需要解压的zip文件名 FileOutputStream fileOut; File file; String f=unZipfileName.substring(0, unZipfileName.length()-4);File ff=new File(f);try{ this.zipIn = new ZipInputStream (new BufferedInputStream(new FileInputStream(unZipfileName))); while((this.zipEntry = this.zipIn.getNextEntry()) != null){ file = new File(this.zipEntry.getName()); if(this.zipEntry.isDirectory()){ file.mkdirs(); } else{ //如果指定文件的目录不存在,则创建之. File parent = file.getParentFile(); if(!parent.exists()){ parent.mkdirs(); } if(!ff.exists()){ff.mkdir();}fileOut = new FileOutputStream(f+"/"+file.getName()); //fileOut = new FileOutputStream(file); 此方法存放到该项目目录下while(( this.readedBytes = this.zipIn.read(this.buf) ) > 0){ fileOut.write(this.buf , 0 , this.readedBytes ); } fileOut.close(); }this.zipIn.closeEntry();}}catch(Exception ioe){ioe.printStackTrace(); }} //设置缓冲区大小 public void setBufSize(int bufSize){ this.bufSize = bufSize; } //测试Zip类 public static void main(String[] args)throws Exception{ Zip zip=new Zip();zip.doZip("c:\\test");zip.unZip("c:\\test.zip");} 
}