user.java

java聊天室客户端

package C;

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class User implements ActionListener
{
	JDialog dialog;
    JPanel panel1, panel2, panel3;
    JLabel label1, label2;
    JTextField textField_username;
    JButton button_save, button_cancel;
    static String userName = "匆匆过客";
    
    public void init(){
    	dialog = new JDialog();
    	dialog.setTitle("用户设置");
    	panel1 = new JPanel();
    	panel2 = new JPanel();
    	panel3 = new JPanel();
    	label1 = new JLabel("请输入用户名：");
    	textField_username = new JTextField("匆匆过客",10);
    	label2 = new JLabel("默认用户名为：匆匆过客");
    	button_save = new JButton("保存");
    	button_save.addActionListener(this);
    	button_cancel = new JButton("取消");
    	button_cancel.addActionListener(this);
    	
    	panel1.add(label1); 
    	panel1.add(textField_username);
    	panel3.add(label2);
    	panel2.add(button_save);
    	panel2.add(button_cancel);
    	
    	dialog.add(panel1,BorderLayout.NORTH);
    	dialog.add(panel3,BorderLayout.CENTER);
    	dialog.add(panel2,BorderLayout.SOUTH);

    	dialog.setSize(300, 120);
    	Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
    	dialog.setLocation((d.width - dialog.getWidth())/2
				,(d.height - dialog.getHeight())/2);
    	dialog.setVisible(true);
    	
    }

	public void actionPerformed(ActionEvent e)
	{
		Object obj = e.getSource();
		if(obj == button_save){
			if(textField_username.getText().equals("")){
				label2.setText("用户名不能为空！");
				textField_username.setText(userName);
				return;
			}
			userName = textField_username.getText();
			dialog.dispose();
		}else if(obj == button_cancel){
			dialog.dispose();
		}
	}
    
}