简易客户端--服务器聊天程序

• 功能：简单的客户端和服务器互发信息。

• 服务器端:

  import javax.swing.*;
  import java.net.*;
  import java.awt.BorderLayout;
  import java.awt.event.ActionEvent;
  import java.awt.event.ActionListener;
  import java.io.*;
  //服务器端
  public class MyServer extends JFrame implements ActionListener{
  	JTextArea jta = null;
  	JScrollPane jsp = null;
  	JTextField jtf = null;
  	JButton jb = null;
  	JPanel jp = null;
  	//把信息发送给客户端的信息
  	PrintWriter pw = null;
  	//主方法
  	public static void main(String[] args) {
  		MyServer ms = new MyServer();
  	}
  	//构造器
  	public MyServer(){
  		this.setTitle("简易聊天--服务器端");
  		this.setLocation(500, 100);
  		this.setResizable(false);
  		jta = new JTextArea();
  		jsp = new JScrollPane(jta);
  		jtf = new JTextField(10);
  		jb = new JButton("发送");
  		jb.addActionListener(this);
  		jp = new JPanel();
  		jp.add(jtf);
  		jp.add(jb);
  		this.add(jsp,BorderLayout.CENTER);
  		this.add(jp,BorderLayout.SOUTH);
  		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  		this.setSize(300, 200);
  		this.setVisible(true);
  		try {
  			//服务器监听
  			ServerSocket ss = new ServerSocket(9999);
  			//等待客户端连接
  			Socket s = ss.accept();
  			InputStreamReader isr = new InputStreamReader(s.getInputStream());
  			BufferedReader br = new BufferedReader(isr);
  			pw = new PrintWriter(s.getOutputStream(),true);
  			//读取从客户端发来的信息
  			while(true){
  				//读取从客户端发来的信息
  				String info = br.readLine();
  				jta.append("客户端对服务器说："+info+"\r\n");
  			}
  		} catch (IOException e) {
  			e.printStackTrace();
  		}
  		
  	}
  	@Override
  	public void actionPerformed(ActionEvent e) {
  		//如果用户按下发送信息按钮
  		if(e.getSource()==jb){
  			//把服务器在jtf写的内容发送给客户端
  			String info = jtf.getText();
  			jta.append("服务器对客户端说："+info+"\r\n");
  			pw.println(info);
  			//清空发送框内容
  			jtf.setText("");
  		}
  	}
  }

• 客户端：

  import javax.swing.*;
  import java.net.*;
  import java.awt.BorderLayout;
  import java.awt.event.ActionEvent;
  import java.awt.event.ActionListener;
  import java.io.*;
  //客户机端
  public class MyClient extends JFrame implements ActionListener{
  	JTextArea jta = null;
  	JScrollPane jsp = null;
  	JTextField jtf = null;
  	JButton jb = null;
  	JPanel jp = null;
  	PrintWriter pw = null;
  	//主方法
  	public static void main(String[] args) {
  		MyClient ms = new MyClient();
  	}
  	//构造器
  	public MyClient(){
  		this.setTitle("简易聊天--客户机端");
  		this.setResizable(false);
  		this.setLocation(100, 100);
  		jta = new JTextArea();
  		jsp = new JScrollPane(jta);
  		jtf = new JTextField(10);
  		jb = new JButton("发送");
  		jb.addActionListener(this);
  		jp = new JPanel();
  		jp.add(jtf);
  		jp.add(jb);
  		this.add(jsp,BorderLayout.CENTER);
  		this.add(jp,BorderLayout.SOUTH);
  		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  		this.setSize(300, 200);
  		this.setVisible(true);
  		try {
  			Socket s = new Socket("127.0.0.1",9999);
  			InputStreamReader isr = new InputStreamReader(s.getInputStream());
  			BufferedReader br = new BufferedReader(isr);
  			pw = new PrintWriter(s.getOutputStream(),true);
  			while(true){
  				//不停地读取从服务器端发来的信息
  				String info = br.readLine();
  				jta.append("服务器对客户端说："+info+"\r\n");
  			}
  		} catch (UnknownHostException e) {
  			e.printStackTrace();
  		} catch (IOException e) {
  			e.printStackTrace();
  		}
  	}
  	@Override
  	public void actionPerformed(ActionEvent e) {
  		if(e.getSource()==jb){
  			String info = jtf.getText();
  			//把客户端发送的信息显示在jfa
  			jta.append("客户端对服务器说："+info+"\r\n");
  			pw.println(info);
  			jtf.setText("");
  		}
  	}
  }