文档介绍：import .ftp.*;
import .*;
import .*;
import .*;
import .*;
import .*;
public class FtpApplet extends Applet
{
FtpClient aftp;
DataOutputStream outputs ;
InputStream ins;
OutputStream 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();
setLayout(new GridBagLayout());
GridBagConstraints GBC = new GridBagConstraints();
LblPrompt = new Label("没有连接主机");
();
BtnConn = new Button("连接");
BtnClose = new Button("断开");
(false);
TxtUID = new TextField("",15);
TxtPWD = new TextField("",15);
(’*’);
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);
(false);
= ;
     = ;
((GridBagLayout)getLayout()).setConstraints(LblPrompt,GBC);
add(LblPrompt);
=1;
((GridBagLayout)getLayout()).setConstraints(LblHost,GBC);
add(LblHost);
=;
((GridBagLayout)getLayout()).setConstraints(TxtHost,GBC);
add(TxtHost);
=1;
((GridBagLayout)getLayout()).setConstraints(LblUID,GBC);
add(LblUID);
=1;
((GridBagLayout)getLayout()).setConstraints(TxtUID,GBC);
add(TxtUID);
=1;
((GridBagLayout)getLayout()).setConstraints(LblPWD,GBC);
add(LblPWD);
=1;
((GridBagLayout)getLayout()).setConstraints(TxtPWD,GBC);
add(TxtPWD);
=1;
=2;
((GridBagLayout)getLayout()).setConstraints(BtnConn,GBC);
add(BtnConn);
=;
((G