login.java

Chat案例 SWING多人聊天系统

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class Login implements ActionListener{
	
	JFrame jf = new JFrame("login");
	JPanel p1 = new JPanel();
	JPanel p2 = new JPanel();
	
	JLabel l1 = new JLabel("please input your name:");
	JLabel l2 = new JLabel("input server's IP address:");
	
	JTextField t1 = new JTextField();
	JTextField t2 = new JTextField("127.0.0.1");
	
	JButton b=new JButton("Login");
	
	public static void main(String[] args)
	{
		Login aa= new Login();
	}
		
	public Login(){//构造方法
		p1.setLayout(new GridLayout(2,2));
		p1.add(l1);
		p1.add(t1);
		p1.add(l2);
		p1.add(t2);
		
		p2.setLayout(new FlowLayout());
		p2.add(b);
		
		jf.getContentPane().add(p1,"North");//JFrame jf
		jf.getContentPane().add(p2);//默认添加到Center
		
		jf.pack();
		jf.setLocation(300,200);
		
		//jf.show();已过时
		jf.setVisible(true);
		
		t2.addActionListener(this);
		b.setMnemonic(KeyEvent.VK_L);
		b.setToolTipText("按此键登录");
		b.addActionListener(this);
		
	}
	
	public void actionPerformed(ActionEvent e)
	{
		if(t1.getText().equals("")  && t2.getText().equals(""))//当没有输入用户名＆服务器IP时
		{
			//System.out.println("Please input your loginname and servername");
			JOptionPane.showMessageDialog(null,"请输入用户名和服务器ip","系统提示",JOptionPane.ERROR_MESSAGE);
			System.exit(1);
		}
		else if(t2.equals(""))//当没有输入服务器IP
		{
			//System.out.println("Please input the Chat server you want to connect.");
			JOptionPane.showMessageDialog(null,"请输入服务器ip","系统提示",JOptionPane.ERROR_MESSAGE);
			System.exit(1);
		}
		else//如果输入合法,则与服务器建立连接,开始聊天
		{					
			TestClient c=new TestClient(t1.getText(),t2.getText());
			jf.setVisible(false);
		}
	}
	
}