java网络通信技术之简单聊天小程序

package ChatTwoPackage;
 
import java.io.*;
import java.net.*;
 
public class ChatTwoServer {
 
 public ChatTwoServer(int port,String name) throws IOException
 {
 ServerSocket server=new ServerSocket(port);//创建seversocket对象，提供tcp连接服务。指定端口port，等待tcp连接。
 System.out.print("正在等待连接，请勿操作！");
 Socket client=server.accept();//创建socket对象，它等待接收客户端的连接。
 new ChatTwoClient(name,client);//实现图形界面。
 server.close();
 }
 
 public static void main(String[] args) throws IOException {
 new ChatTwoServer(2001,"SQ");
 
 }
 
}

package ChatTwoPackage;
 
import java.awt.event.*;
import javax.swing.*;
import java.net.*;
import java.io.*;
 
public class ChatTwoClient extends JFrame implements ActionListener {
 private String name;
 private JTextArea text_re;
 private JTextField text_se;
 private PrintWriter cout;
 private JButton buttons[];
 public ChatTwoClient(String name,Socket socket) throws IOException
 {
 super("我:"+name+InetAddress.getLocalHost().getHostAddress()+":"+socket.getLocalPort());
 this.setBounds(320, 240, 400, 240);
 this.text_re=new JTextArea();
 this.text_re.setEditable(false);
 this.getContentPane().add(new JScrollPane(this.text_re));
 
 JToolBar toolBar=new JToolBar();
 this.getContentPane().add(toolBar,"South");
 toolBar.add(this.text_se=new JTextField(30));
 buttons=new JButton[2];
 buttons[0]=new JButton("发送");
 buttons[1]=new JButton("下线");
 toolBar.add(buttons[0]);
 toolBar.add(buttons[1]);
 buttons[0].addActionListener(this);
 buttons[1].addActionListener(this);//给按钮添加事件监听，委托当前对象处理
 this.setVisible(true);
 this.name=name;
 this.cout=new PrintWriter(socket.getOutputStream(),true);//获得socket输出流
 this.cout.println(name);
 BufferedReader br=new BufferedReader(new InputStreamReader(socket.getInputStream())); //将socket的字节输入流转换为字符流，默认GBK字符集，再创建缓冲字符输入流
        String line="连接"+br.readLine()+"成功";
        while(line!=null&&!line.endsWith("bye"))
 {
  text_re.append(line+"\r\n");
  line=br.readLine();
 }//读取对方发送的内容并显示，直到内容为为空或对方下线
 br.close();
 this.cout.close();
 socket.close();
 buttons[0].setEnabled(false);
 buttons[1].setEnabled(false);
 }
 public ChatTwoClient(String name,String host,int port) throws IOException
 {
 this(name,new Socket(host,port));//调用另一个构造方法
 }
 public void actionPerformed(ActionEvent ev)
 {
 if(ev.getActionCommand().equals("发送"))
 {
  this.cout.println(name+":"+text_se.getText());
  text_re.append("我："+text_se.getText()+"\n");
  text_se.setText("");
 }//按下发送按钮后，将内容发出，并更新自己聊天框的内容
 if(ev.getActionCommand().equals("下线"))
 {
  text_re.append("你已下线\n");
  this.cout.println(name+"离线\n"+"bye\n");
  buttons[0].setEnabled(false);
  buttons[1].setEnabled(false);
 }//下线按钮按下后，发送bye作为下线标记
 }
 
 
 public static void main(String[] args) throws IOException {
 new ChatTwoClient("mxl","127.0.0.1",2001); //ip地址和端口
 
 }
 
}