程式扎記: [ Java代碼範本 ] 用java壓縮/解壓縮文件示例（沒有中文問題）

參考這裡
這本是別人的東西，我只是修改了中文問題。在這個基礎上改一下就可以壓縮多個文件和目錄，甚至可以寫一個winzip之類的東東哦，有興趣的可以研究一下。
壓縮Sample code:

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import java.io.*;  
import java.util.zip.*;  
  /** 
   * @version Version 1.3 
   */  
  public class w0514{  
       public static void main(String[] args){  
          try{  
              BufferedReader in=new BufferedReader(  
                                  new InputStreamReader(new FileInputStream(args[0]),"ISO8859_1"));  
              FileOutputStream f=new FileOutputStream(args[1]+".zip");  
              CheckedOutputStream ch=new CheckedOutputStream(f,new CRC32());  
              ZipOutputStream out=new ZipOutputStream(  
                                     new BufferedOutputStream(ch));  
         
             int c;  
             out.putNextEntry(new ZipEntry(args[0]));  
             while((c=in.read())!=-1)  
                 out.write(c);  
               in.close();  
               out.close();  
             }  
          catch(Exception e){  
              e.printStackTrace();  
             }  
     }  
  }  

解壓縮Sample code:
Java內建支援ZIP格式檔案的壓縮及解壓縮，透過使用java.util.zip套件，我們可以用來將網頁上傳的ZIP檔案加以解壓縮再做後續處理。這裡我們可以先將解壓縮的固定步驟寫成一個UnZipBean，後續要解壓縮zip時只要先將檔名及解壓縮的目錄傳進去，再呼叫unzip()函式即可。

詳細代碼請到這裡

下面是經過我改良過的Code:
UnZipBean:

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package gays.util;  
  
import java.io.BufferedInputStream;  
import java.io.BufferedOutputStream;  
import java.io.File;  
import java.io.FileOutputStream;  
import java.io.FileNotFoundException;  
import java.io.InputStream;  
import java.io.IOException;  
import java.util.Enumeration;  
import java.util.zip.CRC32;  
import java.util.zip.CheckedOutputStream;  
import java.util.zip.ZipEntry;  
import java.util.zip.ZipException;  
import java.util.zip.ZipFile;  
import java.util.zip.ZipOutputStream;  
import java.io.*;  
  
public class UnZipBean {      
    public static final int EOF = -1;  
    static final int BUFFER = 2048;  
  
    private String zipFile;  
    private String targetDirectory;  
    private ZipFile zf;  
      
    /** Constructor */  
    public UnZipBean() {         
    }  
      
    public UnZipBean(String zipFile, String targetDirectory) {  
        this.zipFile = zipFile;  
        this.targetDirectory = targetDirectory;  
    }  
      
    public void setZipFile(String zipFile) {  
        this.zipFile = zipFile;  
    }  
      
    public String getZipFile() {  
        return zipFile;  
    }  
      
    public void setTargetDirectory(String targetDirectory) {  
        this.targetDirectory = targetDirectory;  
    }  
      
    public String getTargetDirectory() {  
        return targetDirectory;  
    }  
      
    /** 
     * BD : According to the input parameters, zip the file/folder indicated by member property:'s' and save 
     *      into the file indicated by member property:'t'. If the  
     * Change History : 
     *   2009/09/27 John Lee 
     *     Release 
     * @param s 
     * @param t 
     * @return 
     */  
    public boolean zip(String s,String t){                
        File source = new File(s);        
        File target = new File(t);        
        if(!target.exists()){  
            try {  
                System.out.println("Prepare "+target.getAbsolutePath()+"...");  
                target.createNewFile();  
            } catch (IOException e) {                 
                e.printStackTrace();  
            }  
        }  
        if(source.exists()){  
            try{                                  
                FileOutputStream f=new FileOutputStream(t);  
                CheckedOutputStream ch=new CheckedOutputStream(f,new CRC32());  
                ZipOutputStream out=new ZipOutputStream(  
                         new BufferedOutputStream(ch));  
                zipFile(out,source);  
                out.closeEntry();  
                out.close();  
                return true;  
            }catch(IOException ioe){  
                ioe.printStackTrace();  
            }             
        }else{  
            System.err.println("Source File doesn't exist! "+source.getAbsolutePath());  
        }  
        return false;  
    }  
      
    protected boolean zipFile(ZipOutputStream out,File f) throws IOException{         
        if(f.exists()){           
            if (f.isDirectory()) {  
                System.out.print("zipFile: "+f.getAbsolutePath());  
                File[] files = f.listFiles();  
                if(files.length==0){  
                    System.out.println("(Empty folder)");  
                    out.putNextEntry(new ZipEntry(f.getAbsoluteFile()+"/"));  
                }else{  
                    System.out.println("("+files.length+")");  
                }  
                for(int i=0;i
                  zipFile(out,files[i]);      
                }  
            } else {  
                System.out.println("\tZIP "+f.getAbsolutePath()+"...");  
                out.putNextEntry(new ZipEntry(f.getAbsolutePath()));  
                byte[] buf = new byte[1024];  
                int len;  
                FileInputStream fis = new FileInputStream(f);  
                while ((len = fis.read(buf)) > 0) {  
                    out.write(buf, 0, len);  
                }  
                fis.close();  
            }         
            return true;  
        }else{  
            System.out.println(f.getAbsolutePath()+" not exist!");  
        }  
        return false;  
    }  
      
    /** 
     * BD : Unzip the file indicated by member property:'zipFile' to the folder indicated by 
     *      member property:'targetDirectory' 
     * Change History : 
     *   2009/09/27 John Lee 
     *     Release 
     * @return 
     */  
    public boolean unzip() {  
        boolean done = false;  
        if (zipFile != null) {            
            try {              
                zf = new ZipFile(zipFile);  
                Enumeration enumeration = zf.entries();  
                while (enumeration.hasMoreElements()) {  
                    ZipEntry target = (ZipEntry)enumeration.nextElement();  
                    System.out.print(target.getName() + " .");  
                    saveEntry(target);  
                    System.out.println(". unpacked");  
                }  
                done = true;  
            }  
            catch (FileNotFoundException e){  
                System.out.println("zipfile not found"+e.getMessage());  
            }  
            catch (ZipException e){  
                System.out.println("zip error..."+e.getMessage());  
            }  
            catch (IOException e){  
                System.out.println("IO error..."+e.getMessage());  
            }   
            finally {  
                try {  
                    zf.close();  
                } catch (IOException e) {  
                    System.out.println("IO error...Can't close zip file"+e.getMessage());  
                }  
            }  
        }  
        return done;  
    }  
  
    private void saveEntry(ZipEntry target)  
                                   throws ZipException, IOException {  
        try {  
            File file = new File(targetDirectory + File.separator + target.getName());  
            if (target.isDirectory()) {  
                file.mkdirs();  
            }  
            else {  
                InputStream is = zf.getInputStream(target);  
                BufferedInputStream bis = new BufferedInputStream(is);  
                File dir = new File(file.getParent());  
                dir.mkdirs();  
                FileOutputStream fos = new FileOutputStream(file);  
                BufferedOutputStream bos = new BufferedOutputStream(fos);  
  
                int c;  
                byte[] data = new byte[BUFFER];  
                while((c = bis.read(data, 0, BUFFER)) != EOF) {  
                    bos.write(data, 0, c);  
                }  
                bos.flush();  
                bos.close();  
                fos.close();  
            }  
        }  
        catch (ZipException e) {  
            throw e;  
        }  
        catch (IOException e) {  
            throw e;  
        }  
    }  
}  

參考資料：
http://java.sun.com/developer/technicalArticles/Programming/compression/
http://www.wakhok.ac.jp/~tatsuo/sen97/10shuu/UnZip.java.html

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2011年11月29日星期二

[ Java代碼範本 ] 用java壓縮/解壓縮文件示例（沒有中文問題）

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[Git 常見問題] error: The following untracked working tree files would be overwritten by merge

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2011年11月29日 星期二