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!");
        }
    }
}