简单的服务器和客户端程序代码实例

简单的服务器和客户端程序代码实例 

练习Socket，DataInputStream，DataOutputStream，Thread，ActionListener的应用，功能很简单就是客户端输入用户名回车服务器校验用户名是否合法，我定义了只有jiqimiao时才是合法的。

服务器端代码如下：

import java.awt.*;
import java.io.*;
import java.net.*;
import java.util.*;

import javax.swing.*;

/**
 * 服务器端程序
 * @author 左杰
 *
 */
public class TestServer extends JFrame {
    /**
     * 
     */
    private static final long serialVersionUID = -4148974450944551683L;

    private JTextArea jta = new JTextArea();

    public static void main(String[] args) {
        new TestServer();
    }

    public TestServer() {
        this.getContentPane().setLayout(new BorderLayout());
        this.getContentPane().add(new JScrollPane(jta), BorderLayout.CENTER);
        setTitle("server");
        setSize(500, 300);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
        try {
            ServerSocket serverSocket = new ServerSocket(5000);//绑定服务器端口
            jta.append("server start at " + new Date() + " ");
            while (true) {
                Socket socket = serverSocket.accept();//服务器监听
                //启动监听线程
                HandleClint thread = new HandleClint(socket);
                thread.start();
            }
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
/**
 * 接收和发送客户端的线程
 * @author 左杰
 *
 */
    class HandleClint extends Thread {
        private Socket socket;

        public HandleClint(Socket socket) {
            this.socket = socket;
        }

        public void run() {
            try {
                DataInputStream inputFromClient = new DataInputStream(socket
                        .getInputStream());
                DataOutputStream outputToClient = new DataOutputStream(socket
                        .getOutputStream());
                while (true) {
                    String ins = DataInputStream.readUTF(inputFromClient);//接收客户端信息
                    String outs = "您不是合法用户";
                    if (ins.equals("jiqimiao")) {
                        outs = "欢迎您：" + ins;
                    }
                    outputToClient.writeUTF(outs);//发送到客户端信息
                    jta.append(outs + " ");
                }
            } catch (Exception e) {
            }
        }
    }
}

客户端代码如下：

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.Socket;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;

/**
 * 客户端程序
 * @author 左杰
 *
 */
public class TestClient extends JFrame implements ActionListener{
    /**
     * 
     */
    private static final long serialVersionUID = -1751294222460334070L;
    private JTextArea jta = new JTextArea();
    private JTextField jtf = new JTextField();
    private DataOutputStream toServer;
    private DataInputStream fromServer;
    public static void main(String[] args){
        new TestClient();
    }
    public TestClient(){
        JPanel p = new JPanel();
        p.setLayout(new BorderLayout());
        p.add(new JLabel("请输入用户名："),BorderLayout.WEST);
        p.add(jtf,BorderLayout.CENTER);
        jtf.setHorizontalAlignment(JTextField.LEFT);
        
        this.getContentPane().setLayout(new BorderLayout());
        this.getContentPane().add(p,BorderLayout.NORTH);
        this.getContentPane().add(new JScrollPane(jta),BorderLayout.CENTER);
        jtf.addActionListener(this);//添加事件侦听
        setTitle("Client");
        setSize(500, 300);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
        try {
            Socket socket = new Socket("localhost",5000);//链接指定服务器和端口
            this.fromServer = new DataInputStream(socket.getInputStream());
            this.toServer = new DataOutputStream(socket.getOutputStream());
        }catch (IOException e) {
            // TODO Auto-generated catch block
            jta.append(e.toString()+" ");
        }
        
    }
    public void actionPerformed(ActionEvent e) {//定义侦听器
        if (e.getSource() instanceof JTextField) {
            try {
                String tos = jtf.getText().trim();
                toServer.writeUTF(tos);
                toServer.flush();
                String gets = DataInputStream.readUTF(fromServer);;
                jta.append(gets+" ");
            } catch (IOException e1) {
                // TODO Auto-generated catch block
                System.err.println(e1);
            }
            
            
        }
    }
    
}

大家共同学习，共同进步。