使用Java实现文件的压缩和解压缩
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- 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!"); } } }