使用Java实现文件的压缩和解压缩

1、使用Java实现文件的压缩和解压缩在学习编程的过程中，我觉得不止要获得课本的知识，更多的是通过学习技术知识提高解决问题的能力，这样我们才能走在最前方，更多Java学习，请搜索疯狂Java；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.z

2、ip.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：java view plaincopyimport java.io.

3、*;import java.util.zip.*;/*author Winty*Usage:* 压缩:java Zip -zip "directoryName"* 解压:java Zip -unzip "fileName.zip"*/public class Zipprivate ZipInputStream zipIn; /解压Zipprivate ZipOutputStream zipOut; /压缩Zipprivate ZipEntry zipEntry;private static int bufSize; /size of bytespriva

4、te byte buf;private int readedBytes;public Zip()this(512);public Zip(int bufSize)this.bufSize = bufSize;this.buf = new bytethis.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

5、() + ".zip"/压缩后生成的zip文件名trythis.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 zipO

6、ut)throws IOExceptionFileInputStream 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 : f

7、iles)/System.out.println(fileName);if(fileName.isDirectory()handleDir(fileName , this.zipOut);elsefileIn = 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);th

8、is.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;trythis.zipIn = new ZipInputStream (new BufferedInputStream(new FileInputStream(unZipfileName);while(this.zipEntry = this.zipIn.getNextEntry() != null)file = new File(t

9、his.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(t

10、his.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 Exceptionif(args.length=2)String name = args1;Zip zip = new Zip();i

11、f(args0.equals("-zip")zip.doZip(name);else if(args0.equals("-unzip")zip.unZip(name);elseSystem.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!"