求助啦~~为什么点击其中的按钮都没反应~~
/*
* Main.java
*
* Created on 2007年12月19日, 下午8:35
*
* To change this template, choose Tools | Template Manager
* and open the template in the editor.
*/
import sun.net.ftp.*;
import sun.net.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
import java.io.*;
public class UseFTP extends JFrame implements ActionListener{
FtpClient aftp;
DataOutputStream outputs; //数据输出流
TelnetInputStream ins; //输入流
TelnetOutputStream outs; //输出流
JTextArea lsArea=new JTextArea(40,100);
JLabel lblPrompt =new JLabel("没有连接主机",Label.LEFT);
JLabel lblHost =new JLabel("主机名：");
JLabel lblUID =new JLabel("用户名：");
JLabel lblPWD =new JLabel("密码：");
JLabel lblFile =new JLabel("要下载的文件名：");
JLabel lblDir =new JLabel("存放文件的路径：");
JButton btnConn=new JButton("连接");
JButton btnClose=new JButton("断开");
JButton btnDown=new JButton("下载");
JButton btnUp=new JButton("上传");
JTextField txtHost=new JTextField(34);
JTextField txtUID=new JTextField(14);
JPasswordField txtPWD=new JPasswordField(14);
JTextField txtDir=new JTextField(29);
JTextField txtFile=new JTextField(29);
int ch;
String a="没有连接主机";
String hostname="";
public UseFTP(){
JPanel p1=new JPanel(new FlowLayout(FlowLayout.LEFT));
JPanel p2=new JPanel(new FlowLayout(FlowLayout.LEFT));
JPanel p3=new JPanel(new FlowLayout(FlowLayout.LEFT));
btnClose.enable(false);
p1.add(lblPrompt);
p2.add(lblHost);p2.add(txtHost);p2.add(btnConn);
p3.add(lblUID);p3.add(txtUID);p3.add(lblPWD);
p3.add(txtPWD);p3.add(btnClose);
JPanel top =new JPanel(new GridLayout(3,1));
top.add(p1);top.add(p2);top.add(p3);
lsArea.setEditable(false);
JScrollPane jsp=new JScrollPane(lsArea);
JPanel bottom=new JPanel(new GridLayout(2,1));
JPanel p4=new JPanel(new FlowLayout(FlowLayout.LEFT));
JPanel p5=new JPanel(new FlowLayout(FlowLayout.LEFT));
p4.add(lblFile);p4.add(txtFile);p4.add(btnUp);
p5.add(lblDir);p5.add(txtDir);p5.add(btnDown);
bottom.add(p4);bottom.add(p5);
this.getContentPane().add(top,"North");
this.getContentPane().add(jsp,"Center");
this.getContentPane().add(bottom,"South");
this.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
try{aftp.closeServer();
}catch(Exception ee){}
dispose();
System.exit(0);
}
});
setSize(520,400);
setTitle("FTP客户端");
setVisible(true);
}
public boolean connect(String hostname,String uid,String pwd){ //连接函数
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){
lblPrompt.setText("无权限与主机："+hostname+"连接！");
return false;
}
catch(IOException e){
lblPrompt.setText("连接主机："+hostname+"失败！");
return false;
}
catch(SecurityException e){
lblPrompt.setText("无权限与主机："+hostname+"连接！");
return false;
}
lblPrompt.setText("连接主机："+hostname+"成功！");
return true;
}
public void actionPerformed(ActionEvent e){ //点击按钮相应的响应
if(e.getSource()==btnConn){ //连接按钮
lblPrompt.setText("正在连接，请等待……");
if(connect(txtHost.getText(),txtUID.getText(),txtPWD.getText())){
btnConn.setEnabled(false);
btnClose.setEnabled(true);
}
}
else if(e.getSource()==btnClose){ //断开按钮
try{
aftp.closeServer();
}
catch(IOException ee) {}
btnConn.enable(true);
btnClose.enable(false);
lblPrompt.setText("与主机"+hostname+" 连接已断开");
}
else if(e.getSource()==btnDown){ //下载按钮
downLoad(txtDir.getText(),txtFile.getText());
}
else if(e.getSource()==btnUp){ //上传按钮
sendFile(txtDir.getText()+"//"+txtFile.getText());
}
}
public void sendFile(String filepathname){ //上传文件；
if (aftp!=null){
lblPrompt.setText("正在粘贴文件，请耐心等待……");
String contentperline;
try{
String fg=new String("\\");
int index=filepathname.lastIndexOf(fg);
String filename=filepathname.substring(index+1);
File localFile=new File(filepathname);
RandomAccessFile file =new RandomAccessFile(filepathname,"r");
file.seek(0);
outs =aftp.put(filename);
outputs=new DataOutputStream(outs);
while(file.getFilePointer()<file.length()){
ch=file.read();
outputs.write(ch);
}
outs.close();
file.close();
lblPrompt.setText("粘贴成功！");
showFileContents();
return;
}
catch(IOException e){}
}
lblPrompt.setText("粘贴失败！");
}
public void showFileContents() { //显示目录和文件名
StringBuffer buf =new StringBuffer();
lsArea.setText("");
try{
ins=aftp.list(); //获得所有文件和目录的输入数据流；
while((ch=ins.read())>=0){
buf.append((char)ch);
}
lsArea.append(buf.toString());
ins.close();
}catch(IOException e){}
}
public void downLoad(String dir,String fname){ //下载文件
StringBuffer buf =new StringBuffer();
buf.setLength(0);
try{
File f=new File(new File(dir),fname); //通过路径和文件名够着一个文件
RandomAccessFile file=new RandomAccessFile(f,"rw");
ins=aftp.get(fname); //得到所选文件的输入流
while((ch=ins.read())>=0){ //读取数据流
buf.append((char)ch);
}
file.writeBytes(buf.toString()); //将缓冲区的数据以字符串形式写入文件
file.close(); //关闭文件
lblPrompt.setText("下载成功！");
return;
} catch(Exception e){}
lblPrompt.setText("下载成功！");
}
public static void main(String args[]){
Font font=new Font("JFrame",Font.PLAIN,14); //定义字体
Enumeration keys=UIManager.getLookAndFeelDefaults().keys();
while(keys.hasMoreElements()){
Object key=keys.nextElement();
if(UIManager.get(key)instanceof Font)UIManager.put(key,font);
}
new UseFTP();
}
}
------解决方案--------------------
按钮并没有注册动作事件，例：btnConn.addActionlListener(this);
[解决办法]
你不注册事件源它怎么知道要触发什么事件呢？比如：点击按钮，鼠标移动到按钮上，还有鼠标按下和弹起也会触发事件等等．
[解决办法]
没有注册事件源，应该给每一个按钮都注册一个事件，如btnClose.addActionListener(New ActionListener()
{
public void actionPerformed(ActionEvent event)
{
…………………………………………………………处理过程
}
}
)
[解决办法]
没有监听 那些按钮就是可以响应鼠标的图片
[解决办法]
学习
