import java.io.*;
import java.util.zip.*;
/**
*功能:zip壓縮、解壓
*說明:本程序通過ZipOutputStream和ZipInputStream實現了zip壓縮和解壓功能.
*問題:由于java.util.zip包并不支持漢字,當zip文件中有名字為中文的文件時,
*     就會出現異常:"Exception  in thread "main " java.lang.IllegalArgumentException  
*               at   java.util.zip.ZipInputStream.getUTF8String(ZipInputStream.java:285)
*解決:
*　　方法1、修改import java.util.zip.ZipInputStream和ZipOutputStream.
*          java.util.zip只支持UTF-8,Ant里面可以指定編碼.
*　　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.*;
*
*僅供編程學習參考.
*
*@author Winty
*@date   2008-8-3
*@Usage:
*   壓縮:java Zip -zip "directoryName"
*   解壓:java Zip -unzip "fileName.zip"
*/

public class Zip{
    private ZipInputStream  zipIn;      //解壓Zip
    private ZipOutputStream zipOut;     //壓縮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];
    }
    
    //壓縮文件夾內的文件
    public void doZip(String zipDirectory){//zipDirectoryPath:需要壓縮的文件夾名
        File file;
        File zipDir;

        zipDir = new File(zipDirectory);
        String zipFileName = zipDir.getName() + ".zip";//壓縮后生成的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調用,遞歸完成目錄文件讀取
    private void handleDir(File dir , ZipOutputStream zipOut)throws IOException{
        FileInputStream fileIn;
        File[] files;

        files = dir.listFiles();
    
        if(files.length == 0){//如果目錄為空,則單獨創建之.
            //ZipEntry的isDirectory()方法中,目錄以"/"結尾.
            this.zipOut.putNextEntry(new ZipEntry(dir.toString() + "/"));
            this.zipOut.closeEntry();
        }
        else{//如果目錄不為空,則分別處理目錄和文件.
            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();
                }
            }
        }
    }

    //解壓指定zip文件
    public void unZip(String unZipfileName){//unZipfileName需要解壓的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{
                    //如果指定文件的目錄不存在,則創建之.
                    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();
        }
    }

    //設置緩沖區大小
    public void setBufSize(int bufSize){
        this.bufSize = bufSize;
    }

    //測試Zip類
    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("壓縮:java Zip -zip directoryName");
            System.out.println("解壓:java Zip -unzip fileName.zip");
            throw new Exception("Arguments error!");
        }
    }
}