使用Java实现文件的压缩和解压缩

• 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.代码如下：

 

 import java.io.*;
 import java.util.zip.*;
 /**
 *@author Winty
 *@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 http://www.bt285.cn /directoryName");
             System.out.println("解压:java Zip -unzip http://www.feng123.com /fileName.zip");
             throw new Exception("Arguments error!");
         }
     }
 }