全双工实现服务器与客户端的通信

/*
 * 服务器端
 */
package TestServer;

import javax.swing.*;
import java.awt.*;
import java.io.*;
import java.net.*;
import java.nio.Buffer;

public class MyServer3 extends JFrame{

	public static void main(String[] args) {
		// TODO Auto-generated method stub

		MyServer3 ms = new MyServer3();
	}

	public MyServer3()
	{

		new ServerSetForm();

	}

}

package TestServer;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.*;
import java.net.*;

public class ServerSetForm extends JFrame implements ActionListener{
	
	JTextArea jta = null;
	JTextField jtf = null;
	JButton jb = null;
	JScrollPane jsp = null;
	
	JPanel jp = null;
	//把信息发给客户端对象
	PrintWriter pw = null;
	public ServerSetForm()
	{
		jta = new JTextArea();
		jtf = new JTextField(20);
		jb = new JButton("发送");
		jb.addActionListener(this);
		jsp = new JScrollPane(jta);
		jp = new JPanel();
		
		this.add(jsp, BorderLayout.CENTER);
		jp.add(jtf);
		jp.add(jb);
		this.add(jp,BorderLayout.SOUTH);
		this.setSize(400,300);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		this.setTitle("服务器端");
		this.setLocationRelativeTo(null);
		this.setResizable(false);
		
		
		this.setVisible(true);
		
		try {
			ServerSocket ss = new ServerSocket(9998);
			Socket s = ss.accept();
			
			InputStreamReader isr = new InputStreamReader(s.getInputStream());
			
			BufferedReader br = new BufferedReader(isr);
			
			pw = new PrintWriter(s.getOutputStream(),true);
			//读取从客户端得到的信息
			while(true)
			{
				String str = br.readLine();
				
				jta.append("服务器接收："+str+"\r\n");
			}
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	@Override
	public void actionPerformed(ActionEvent e) {
		// TODO Auto-generated method stub
		//用户按下发送的按钮
		if(e.getSource() == jb)
		{
			//把服务器在jtf写的内容发送到客户端
			String info = jtf.getText();
			
			jta.append("服务器发出：" + info + "\r\n");
			pw.println(info);
			
			
			//清空jtf的内容
			jtf.setText("");
		}
	}
	
}

/*
 * 客户端
 */
package TestClient;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.io.*;
import java.net.*;

/*
 * KeyListener按键不能发生反应
 * ？？？？？？
 */

public class MyClient3 extends JFrame implements ActionListener,KeyListener{

	JTextArea jta = null;
	JTextField jtf = null;
	JButton jb = null;
	
	JScrollPane jsp = null;
	
	JPanel jp = null;
	PrintWriter pw = null;
	public static void main(String[] args) {
		// TODO Auto-generated method stub

		MyClient3 ms = new MyClient3();
	}

	public MyClient3()
	{
		jta = new JTextArea();
		jtf = new JTextField(20);
		jb = new JButton("发送");
		jb.addActionListener(this);
		addKeyListener(this);
		jsp = new JScrollPane(jta);
		jp = new JPanel();
		
		this.add(jsp, BorderLayout.CENTER);
		jp.add(jtf);
		jp.add(jb);
		this.add(jp,BorderLayout.SOUTH);
		this.setSize(400,300);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		this.setTitle("客户端");
		this.setLocationRelativeTo(null);
		this.setResizable(false);
		
		
		this.setVisible(true);
		
		try {
			Socket s = new Socket("127.0.0.1",9998);
			
			InputStreamReader isr = new InputStreamReader(s.getInputStream());
			BufferedReader br = new BufferedReader(isr);
			
			pw = new PrintWriter(s.getOutputStream(),true);
			
			while(true)
			{
				String info = br.readLine();
				
				/*
				 * append向JTextArea中添加信息的时候不会产生覆盖的现象
				 * setText往JTextArea中添加信息的时候会产生覆盖现象
				 */
				jta.setText("客户端接收到：" + info + "\r\n");
			}
		} catch (UnknownHostException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
	}

	@Override
	public void actionPerformed(ActionEvent arg0) {
		// TODO Auto-generated method stub
		if(arg0.getSource() == jb)
		{
			//getText表示从JTextField中得到要输入的信息
			String str = jtf.getText();
			
			jta.append("客户端发出：" + str + "\r\n");
			
			pw.println(str);
			
			jtf.setText("");
		}
	}

	@Override
	public void keyPressed(KeyEvent e) {
		// TODO Auto-generated method stub
		
		System.out.println("********");
		if(e.getKeyCode() == KeyEvent.VK_ENTER)
		{
			System.out.println("sadfsdfasdfafsdasfadsdfasdfa");
			//getText表示从JTextField中得到要输入的信息
			String str = jtf.getText();
			
			jta.append("客户端发出：" + str + "\r\n");
			
			pw.println(str);
			
			jtf.setText("");
		}
	}

	@Override
	public void keyReleased(KeyEvent e) {
		// TODO Auto-generated method stub
		
	}

	@Override
	public void keyTyped(KeyEvent e) {
		// TODO Auto-generated method stub
		
	}

}

客户端与服务器端不要在同一个工程中

实现界面