java实现将多个文件打包成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;
}

}