有沒有java applet的ftp客戶端下載， 急用。

Question

import sun.net.ftp.*;
import sun.net.*;
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import java.io.*;public class FtpApplet extends Applet
{
    FtpClient aftp;
    DataOutputStream outputs ;
    TelnetInputStream ins;
    TelnetOutputStream outs;
    TextArea lsArea;
    Label      LblPrompt;
    Button   BtnConn;
    Button   BtnClose;
    TextField   TxtUID;
    TextField   TxtPWD;
    TextField   TxtHost;
    int ch;
    public String a="没有连接主机";
            String hostname="";
    public void init () {
        setBackground(Color.white);
        setLayout(new GridBagLayout());
        GridBagConstraints GBC = new GridBagConstraints();
        LblPrompt = new Label("没有连接主机");
        LblPrompt.setAlignment(Label.LEFT);        BtnConn = new Button("连接");
        BtnClose = new Button("断开");
        BtnClose.enable(false);
        TxtUID = new TextField("",15);
        TxtPWD = new TextField("",15);
        TxtPWD.setEchoCharacter('*');
        TxtHost = new TextField("",20);
        Label LblUID = new Label("User ID:");
        Label LblPWD = new Label("PWD:");
        Label LblHost = new Label("Host:");        lsArea = new TextArea(30,80);
        lsArea.setEditable(false);        GBC.gridwidth= GridBagConstraints.REMAINDER;
        GBC.fill      = GridBagConstraints.HORIZONTAL;
        ((GridBagLayout)getLayout()).setConstraints(LblPrompt,GBC);
        add(LblPrompt);        GBC.gridwidth=1;
        ((GridBagLayout)getLayout()).setConstraints(LblHost,GBC);
        add(LblHost);
        GBC.gridwidth=GridBagConstraints.REMAINDER;
        ((GridBagLayout)getLayout()).setConstraints(TxtHost,GBC);
        add(TxtHost);        GBC.gridwidth=1;
        ((GridBagLayout)getLayout()).setConstraints(LblUID,GBC);
        add(LblUID);
        GBC.gridwidth=1;
        ((GridBagLayout)getLayout()).setConstraints(TxtUID,GBC);
        add(TxtUID);        GBC.gridwidth=1;
        ((GridBagLayout)getLayout()).setConstraints(LblPWD,GBC);
        add(LblPWD);
        GBC.gridwidth=1;
        ((GridBagLayout)getLayout()).setConstraints(TxtPWD,GBC);
        add(TxtPWD);        GBC.gridwidth=1;
        GBC.weightx=2;
        ((GridBagLayout)getLayout()).setConstraints(BtnConn,GBC);
        add(BtnConn);
        GBC.gridwidth=GridBagConstraints.REMAINDER;        ((GridBagLayout)getLayout()).setConstraints(BtnClose,GBC);
        add(BtnClose);        GBC.gridwidth=GridBagConstraints.REMAINDER;
        GBC.fill      = GridBagConstraints.HORIZONTAL;
        ((GridBagLayout)getLayout()).setConstraints(lsArea,GBC);
        add(lsArea);
            }    public boolean connect(String hostname, String uid,String pwd)
    {
                        this.hostname = hostname;
        LblPrompt.setText("正在连接，请等待.....");
        try{
           aftp =new FtpClient(hostname);
           aftp.login(uid,pwd);
           aftp.binary();
           showFileContents();
        }
        catch(FtpLoginException e){
            a="无权限与主机:"+hostname+"连接!";
            LblPrompt.setText(a);
            return false;
        }
        catch (IOException e){
            a="连接主机:"+hostname+"失败!";
            LblPrompt.setText(a);
            return false;
        }
        catch(SecurityException e)
        {
            a="无权限与主机:"+hostname+"连接!";
            LblPrompt.setText(a);
            return false;
        }
        LblPrompt.setText("连接主机:"+hostname+"成功!");
        return true;
    }    public void stop()
    {
        try
        {
            aftp.closeServer();
        }
        catch(IOException e)
        {
        }
    }    public void paint(Graphics g){
    }    public boolean action(Event evt,Object obj)
    {
        if (evt.target == BtnConn)
        {
            LblPrompt.setText("正在连接，请等待.....");
            if (connect(TxtHost.getText(),TxtUID.getText(),TxtPWD.getText()))
            {
                BtnConn.setEnabled(false);
                BtnClose.setEnabled(true);
            }
            return true;
        }
        if (evt.target == BtnClose)
        {
            stop();
            BtnConn.enable(true);
            BtnClose.enable(false);
            LblPrompt.setText("与主机"+hostname+"连接已断开!");
            return true;
        }
        return super.action(evt,obj);
    }
    public boolean sendFile(String filepathname){
        boolean result=true;
        if (aftp != null)
        {
        LblPrompt.setText("正在粘贴文件,请耐心等待....");        String   contentperline;
        try{
            a="粘贴成功!";
            String fg =new   String("\\");
            int index = filepathname.lastIndexOf(fg);
            String filename = filepathname.substring(index+1);
            File localFile ;
            localFile = new File(filepathname) ;
            RandomAccessFile sendFile = new RandomAccessFile(filepathname,"r");
            //
            sendFile.seek(0);
            outs = aftp.put(filename);
            outputs = new DataOutputStream(outs);
            while (sendFile.getFilePointer() < sendFile.length() )
            {
               ch = sendFile.read();
               outputs.write(ch);
            }
            outs.close();
            sendFile.close();
        }
        catch(IOException e){
           a = "粘贴失败!";
           result = false ;        }
        LblPrompt.setText(a);
        showFileContents();
        }
        else{
            result = false;
        }
        return result;
    }    public void showFileContents()
    {
        StringBuffer buf = new StringBuffer();
        lsArea.setText("");
        try
        {
            ins= aftp.list();
            while ((ch=ins.read())>=0){
               buf.append((char)ch);
            }
              lsArea.appendText(buf.toString());
            ins.close();
            }
        catch(IOException e)
        {
        }
    }
            public static void main(String args[]){
                  Frame f = new Frame("FTP Client");
                  f.addWindowListener(new WindowAdapter(){
                     public void windowClosing(WindowEvent e){
                           System.exit(0);
                     }                  });
                  FtpApplet ftp = new   FtpApplet();
                  ftp.init();
                  ftp.start();
                  f.add(ftp);
                  f.pack();
                  f.setVisible(true);
            }
}

Answer 1

開始appletviewer能執行成功
後來沒有一點反應了

Answer 2

代码已经很不错了，不过好像还不支持上传下载，有时间的话，我可以帮忙完成。
其实网上有很多，都是国外的，google搜索applet ftp有一堆，一般都是要钱的，我曾下载一个，感觉还不错。

Answer 3

netwebs(Only Java) 的代碼:開始appletviewer能執行成功
後來沒有一點反應了， 真不知道什麼原因。
郁悶