java實作将多個檔案打包成zip

import java.util.List;
import java.util.zip.*;
import java.io.*;
public class ZipCommand {
     private static int ziplevel = 7;
     private File sourceFile = null;
     private File  zipFile = null;
     private ZipOutputStream jos = null;
     private ZipEntry sourEntry = null;
     private String zipfileName = null;
     private String sourceFileName = null;
     private static byte[] buf = new byte[1024];
     
     public static void main(String[] s){
    	 ZipCommand tz = new ZipCommand();
    	//System.out.println( tz.AddtoZip("E:/cis-2000/document/CPoPUserSManual_CPoP_User_s_Manual.doc"));
     }
     
	public String AddtoZip(List sourcefilelist){
		if(sourcefilelist == null || sourcefilelist.size()<1){
			return null;
		}
		sourceFile = new File(sourcefilelist.get(0).toString());
		if(!sourceFile.isFile()){
			return null;
		}else{
			sourceFileName = sourceFile.getName();
			this.setZipfileName(sourceFileName.substring(0,sourceFileName.lastIndexOf("."))+".zip");
		    try{
			zipFile = new File(sourceFile.getParent(),this.getZipfileName());

			if(zipFile.exists()){
	    		int i = 1 ;
	    		while(true){
	    			zipFile = new File(sourceFile.getParent(),this.getZipfileName().substring(0, getZipfileName().lastIndexOf(".zip")) + i + ".zip");
	    			if(!zipFile.exists()) break ;
	    			i++ ;
	    		}
	    	}
			//System.out.println(zipFile.getPath());
			 if(zipFile.exists()){
				 zipFile.deleteOnExit();
			 }
			 zipFile.createNewFile();
			 jos = new ZipOutputStream(new FileOutputStream(zipFile));
			 jos.setLevel(ziplevel);
			 for(int i=0;i<sourcefilelist.size();i++){
			
			 Stzip(jos,new File(sourcefilelist.get(i).toString()));
			 }
			 jos.finish();
		    }catch(Exception e){
		    	return null;
		    }
		    if(zipFile !=null)
			return zipFile.getPath();
		    else{
		    	return null;
		    }
		}
	}
	
	 private  void Stzip(ZipOutputStream jos, File file)
     throws IOException, FileNotFoundException
 {
         
		 sourEntry= new ZipEntry(file.getName());
         FileInputStream fin = new FileInputStream(file);
         BufferedInputStream in = new BufferedInputStream(fin);
         jos.putNextEntry(sourEntry);
         int len;
         while ((len = in.read(buf)) >= 0) 
             jos.write(buf, 0, len);
         in.close();
         jos.closeEntry();
         
     
 }

	 
	public File getSourceFile() {
		return sourceFile;
	}
	public void setSourceFile(File sourceFile) {
		this.sourceFile = sourceFile;
	}

	public String getZipfileName() {
		return zipfileName;
	}

	public void setZipfileName(String zipfileName) {
		this.zipfileName = zipfileName;
	}
	
}