java网络编程（三）：一个类似QQ的聊天程序

客户端：

package QQ;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.Socket;

/**
 * Created by hu on 2015/11/8.
 */
//QQ类似聊天程序的客户端
public class Client extends JFrame {
    static  JTextArea area;
    JTextField field;
    JButton button;
    static PrintWriter writer;
    public Client() {
        this.setTitle("客户端");
        this.setSize(400,500);
        area=new JTextArea(25,30);
        area.setEditable(false);
        field=new JTextField(20);
        button=new JButton("提交");
        JScrollPane sp=new JScrollPane(area);
        JPanel panel=new JPanel();
        this.add(sp, BorderLayout.CENTER);
        panel.add(field);
        panel.add(button);
        this.add(panel,BorderLayout.SOUTH);
        this.setVisible(true);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        button.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String text=field.getText();
                writer.println(text);
                area.append("me:"+text+"\n");
                field.setText("");
            }
        });
    }
    public static void main(String[] args)throws Exception{
        Socket socket=new Socket("127.0.0.1",8899);
        Client client=new Client();
        OutputStream out=socket.getOutputStream();
        BufferedReader reader=new BufferedReader(new InputStreamReader(socket.getInputStream()));
        writer=new PrintWriter(out,true);

        client.addWindowListener(new WindowListener() {
            @Override
            public void windowOpened(WindowEvent e) {

            }

            @Override
            public void windowClosing(WindowEvent e) {
                System.out.println("closing");
                try {
                    socket.shutdownInput();
                    socket.shutdownOutput();
                    socket.close();
                    writer.close();
                    reader.close();
                }catch (Exception exception){
                    exception.printStackTrace();
                }

            }

            @Override
            public void windowClosed(WindowEvent e) {
                System.out.println("closed");

            }

            @Override
            public void windowIconified(WindowEvent e) {

            }

            @Override
            public void windowDeiconified(WindowEvent e) {

            }

            @Override
            public void windowActivated(WindowEvent e) {

            }

            @Override
            public void windowDeactivated(WindowEvent e) {

            }
        });
        while (true){
               try{
                   String line=reader.readLine();
                   area.append("服务器："+line+"\n");
               }catch (Exception exception){
                   System.out.println("客户端程序已经关闭！");
                   break;
               }
        }
    }
}

服务端

package QQ;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
/**
 * Created by hu on 2015/11/8.
 */
/*
* qq类似聊天程序的服务端
* */
public class Server extends JFrame{
    static  JTextArea area;
    JTextField field;
    JButton button;
    static PrintStream writer;
    public  Server(){
        //设置窗口的大小和标题
        this.setTitle("服务器");
        this.setSize(400,500);
        //设置文本区域的大小并且设置为不可编辑
        area=new JTextArea(25,30);
        area.setEditable(false);
        //设置文本输入框的大小
        field=new JTextField(20);
        //设置按钮的
        button=new JButton("提交");
        /*
        * JPanel默认布局的是FlowLayout
        * 可以new的时候就定义成其他布局：
        * JPanel p=new JPanel(new GridLayout(2,1));//两行一列
        * JPanel p=new JPanel(new BorderLayout());
        * */
        JPanel panel=new JPanel();
        JScrollPane sp=new JScrollPane(area);
        this.add(sp, BorderLayout.CENTER);
        panel.add(field);
        panel.add(button);
        this.add(panel,BorderLayout.SOUTH);
        this.setVisible(true);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        //为按钮添加事件
        button.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String text=field.getText();
                writer.println(text);
                area.append("seven_hu:"+text+"\n");
                field.setText("");
            }
        });
    }
    public static void main(String[] args)throws Exception{
        Server server=new Server();
        ServerSocket serverSocket=new ServerSocket(8899);
        System.out.println("Starting listening...");
        while (true){
            Socket socket=serverSocket.accept();
            //获取客户端主机名
            InetAddress address=socket.getInetAddress();
            String name=address.getLocalHost().getHostName();
            System.out.println(name+"已连接");
            BufferedReader reader=new BufferedReader(new InputStreamReader(socket.getInputStream()));
            writer=new PrintStream(socket.getOutputStream(),true);
            String line=null;
            line=reader.readLine();
            if(line!=null){
                area.append("client:"+line+"\n");
            }
        }
    }
}