Using Java.util.zip to achieve file compression and decompression

Import java.io.*;
Import java.util.zip.*;
/** *//**
* Function: Zip compression, decompression
* Description: This program through Zipoutputstream and zipinputstream implementation of the ZIP compression and decompression function.
* Problem: Because the Java.util.zip package does not support Chinese characters, when the zip file has a file with the name Chinese
, author by http://www.bt285.cn http://www.5a520.cn
* There will be an exception: "Exception in Thread" main "java.lang.illegalargumentexceptionbr> *" Java.util.zip.Zip Inputstream.getutf8string (zipinputstream.java:285)
Solution
* Method 1, modify import Java.util.zip.ZipInputStream and Zipoutputstream.
* Java.util.zip only supports utf-8,ant to specify encoding.
* Method 2, using the Zip tool provided in Apache Ant.
* Do not use java.util.zip bag, put the Ant.jar into the classpath.
* Use import org.apache.tools.zip.* in the program;
*
* For programming learning reference only.
*
* @author Winty
* @date 2008-8-3
* @Usage:
* Compression: Java zip-zip "DirectoryName"
* Decompression: Java zip-unzip "Filename.zip"
*/

public class zip{
Private Zipinputstream Zipin; Extract zip
Private Zipoutputstream zipout; Compressed 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];
}

Compress files within a folder
public void Dozip (String zipdirectory) {//zipdirectorypath: folder name to compress
File file;
File Zipdir;

Zipdir = new File (zipdirectory);
String zipfilename = zipdir.getname () + ". zip";//ZIP file name generated after compression

try{
This.zipout = new Zipoutputstream (new Bufferedoutputstream (New FileOutputStream (Zipfilename)));
Handledir (Zipdir, this.zipout);
This.zipOut.close ();
}catch (IOException IoE) {
Ioe.printstacktrace ();
}
}

Called by Dozip, recursively completes the directory file read
private void Handledir (File dir, Zipoutputstream zipout) throws ioexception{
FileInputStream Filein;
file[] files;

Files = Dir.listfiles ();

if (Files.length = = 0) {//If the directory is empty, it is created separately.
In the Isdirectory () method of ZipEntry, the directory ends with "/".
This.zipOut.putNextEntry (New ZipEntry (dir.tostring () + "/"));
This.zipOut.closeEntry ();
}
else{//If the directory is not empty, the directories and files are processed separately.
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 ();
}
}
}
}

Extract the specified zip file
public void UnZip (String unzipfilename) {//unzipfilename zip file name to extract
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{
If the directory for the specified file does not exist, it is created.
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 ();
}
}

Set Buffer size
public void setbufsize (int bufsize) {
This.bufsize = bufsize;
}

Testing the Zip class
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 ("Compression: Java zip-zip http://www.bt285.cn/directoryName");
System.out.println ("Decompression: Java zip-unzip http://www.feng123.com/fileName.zip");
throw new Exception ("Arguments error!");
}
}
}