java应用压缩、解压zip文件

导入java.util.zip.*数据包，

<span style="font-size:14px;">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 = zipDirectory + ".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(Exception 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 Exception{
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){

if(fileName.isDirectory()){
handleDir(fileName , this.zipOut);
}
else{
fileIn = new FileInputStream(fileName);
String name=dir.getName();
//生成的压缩包存放在原目录下
this.zipOut.putNextEntry(new ZipEntry(name+"/"+fileName.getName().toString()));

//此方法存放在该项目目录下
//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,String savedir){//unZipfileName需要解压的zip文件名
FileOutputStream fileOut;
File zipfile=new File(unZipfileName);
File file;
String zipName=zipfile.getName();
String f=zipName.substring(0, zipName.length()-4);
File ff=new File(savedir+"/"+f);
try{
this.zipIn = new ZipInputStream (new
BufferedInputStream(new FileInputStream(unZipfileName)));
while((this.zipEntry = this.zipIn.getNextEntry()) != null){
file = new File(ff+"\\"+this.zipEntry.getName());
System.out.println("zip:"+this.zipEntry.getName());
if(this.zipEntry.isDirectory()){
// file.mkdirs();
System.out.println(file.getAbsolutePath());
File dir=new File(ff+"\\"+this.zipEntry.getName());
System.out.println("dir "+dir.getAbsolutePath());
}
else{
//如果指定文件的目录不存在,则创建之.
File parent = file.getParentFile();
System.out.println("parent:"+parent +" "+file);

if(parent!=null){
if(!parent.exists()){
parent.mkdirs();
System.out.println("parentpath "+parent.getAbsolutePath());
}
}
if(!ff.exists()){
ff.mkdir();
}
// System.out.println(ff+"\\"+file.getName());
fileOut = new FileOutputStream(file);

//fileOut = new FileOutputStream(file); 此方法存放到该项目目录下
while(( this.readedBytes = this.zipIn.read(this.buf) ) > 0){
fileOut.write(this.buf , 0 , this.readedBytes );
}
fileOut.close();
}

this.zipIn.closeEntry();
}
}catch(Exception 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{
Zip zip=new Zip();
zip.unZip("E:\\page\\baidu.zip","C:\\Users\\lmy\\Desktop");
} </span>