java做得比较完善的FTP链接

*******************************************************************************************************
Filename: ftp.java
Author: leetsing(elove)
Create date: 2004-08-30
Use: connect to FTP server,then upload and download file
Modify date: 2004-09-05 add to upload file
2004-09-13 add to download file
Copy right: Magisky Media Technology Co.,Ltd.
*******************************************************************************************************
*/
//import cz.dhl.io.*;
//import cz.dhl.ftp.*;
import sun.net.ftp.*;
import sun.net.*;
import java.applet.*;
import java.io.*;
import java.io.IOException;
import java.util.StringTokenizer;
import sun.net.ftp.FtpClient;
import java.util.ArrayList;
public class ftp extends Applet
{
FtpClient aftp;
DataOutputStream outputs ;
TelnetInputStream ins;
TelnetOutputStream outs;
int ch;
public String a;
String hostname="";
private String path = "/";
public static void main(String[] args)
{
String hostname = "192.168.0.56";
int port = 2121;
String uid = "lee";
String pwd = "lee";
String RWFileDir = "D:\\smsftp\\";//文件目录
//连接ftp服务器
ftp ft = new ftp();
ft.connect(RWFileDir,hostname,port,uid,pwd);
//下载文件
if (ft.aftp != null){
try {
ft.getNameList(RWFileDir);
}catch(IOException e)
{
System.out.println("下载文件出错："+e);
}
}
//上传文件
if (ft.aftp != null){
String sdir = RWFileDir + "subunsubfromsp\\";
File fdir = new File(sdir);
String FileName = "";
for(int i=0;i FileName = sdir + (fdir.list())[i];
ft.uploadFile(RWFileDir,FileName);
}
//System.out.println("成功上传的文件：");
//ft.showFileContents("subunsubfromsp\\");
}
//删除subunsubfromsp目录下已经上传的文件文件
// ft.deleFile(RWFileDir);
//断开服务器连接
ft.stop(RWFileDir);
}
public FtpClient connect(String RWFileDir,String hostname,int port,String uid,String pwd)
{
this.hostname = hostname;
System.out.println("正在连接"+hostname+"，请等待.....");
try{
aftp = new FtpClient(hostname,p