zip解压缩

package com.green.project.compress;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

public class Unzip {

/**
* @param args
*/
byte doc[]=null;
String Filename=null;
String unzipPath=null;

public Unzip(String filename,String unzippath)
{
Filename=filename;
unzipPath=unzippath;
SetUnZipPath(unzipPath);
}

public Unzip(String filename)
{
Filename=filename;
unzipPath=null;
SetUnZipPath(unzipPath);
}

private void SetUnZipPath(String unzippath)
{
if(unzippath.endsWith("//")) //String类的endsWith(char c)用与判断字符串最后一个字符是否与c相同
unzipPath=new String(unzippath);
else
unzipPath=new String(unzippath+"//");
}

public void doUnZip()
{
try {
ZipInputStream zin=new ZipInputStream(new FileInputStream(Filename));
ZipEntry fentry; //用于表示 ZIP 文件条目
while((fentry=zin.getNextEntry())!=null) //ZipInputStream类的geNextEntry()读取下一个 ZIP 文件条目并将流定位到该条目数据的开始处。
{
if(fentry.isDirectory()) //判断文件条目是否目录条目
checkFilePath(unzipPath+fentry.getName());
else
{
String fname=new String(unzipPath+fentry.getName());
FileOutputStream out=new FileOutputStream(fname);
doc=new byte[512];
int n;
while((n=zin.read(doc, 0, 512))!=-1)out.write(doc,0,n);
out.close();
out=null;
doc=null;
}
}//while
zin.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}

private void checkFilePath(String dirName)throws IOException
{
File dir=new File(dirName);
if(!dir.exists())
dir.mkdirs();
}

public static void main(String[] args) {
Unzip myZip=new Unzip("d://phonemanage.zip","d://lib");
myZip.doUnZip();
System.out.println("压缩成功");
}

}