使用java.util.zip实现zip压缩和解压

import java.io.*;
import java.util.zip.*;
/**
*功能:zip压缩、解压
*说明:本程序通过ZipOutputStream和ZipInputStream实现了zip压缩和解压功能.
*问题:由于java.util.zip包并不支持汉字,当zip文件中有名字为中文的文件时,
* 就会出现异常:"Exception in thread "main " java.lang.IllegalArgumentException
* at java.util.zip.ZipInputStream.getUTF8String(ZipInputStream.java:285)
*解决:
*　　方法1、修改import java.util.zip.ZipInputStream和ZipOutputStream.
* java.util.zip只支持UTF-8,Ant里面可以指定编码.
*　　方法2、使用Apache Ant里提供的zip工具。
* 不使用java.util.zip的包,把ant.jar放到classpath中.
* 程序中使用import org.apache.tools.zip.*;
*
*仅供编程学习参考.
*
*@author Winty
*@date 2008-8-3
*@Usage:
* 压缩:java Zip -zip "directoryName"
* 解压:java Zip -unzip "fileName.zip"
*/

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 = zipDir.getName() + ".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(IOException 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 IOException{
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){
//System.out.println(fileName);

if(fileName.isDirectory()){
handleDir(fileName , this.zipOut);
}
else{
fileIn = new FileInputStream(fileName);
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;

try{
this.zipIn = new ZipInputStream (new BufferedInputStream(new FileInputStream(unZipfileName)));

while((this.zipEntry = this.zipIn.getNextEntry()) != null){
file = new File(this.zipEntry.getName());
//System.out.println(file);///

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();
}

fileOut = new FileOutputStream(file);
while(( this.readedBytes = this.zipIn.read(this.buf) ) > 0){
fileOut.write(this.buf , 0 , this.readedBytes );
}
fileOut.close();
}
this.zipIn.closeEntry();
}
}catch(IOException 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{
if(args.length==2){
String name = args[1];
Zip zip = new Zip();

if(args[0].equals("-zip"))
zip.doZip(name);
else if(args[0].equals("-unzip"))
zip.unZip(name);
}
else{
System.out.println("Usage:");
System.out.println("压缩:java Zip -zip directoryName");
System.out.println("解压:java Zip -unzip fileName.zip");
throw new Exception("Arguments error!");
}
}
}

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