package com.yh.mySocket;import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.InetAddress;
import java.net.Socket;public class LoginThread extends Thread {Socket socket = null;public LoginThread() {}public LoginThread(Socket socket) {this.socket = socket;}@Overridepublic void run() {// TODO Auto-generated method stubtry {// 获得输入流，获得相应的用户请求InputStream is = socket.getInputStream();BufferedReader br = new BufferedReader(new InputStreamReader(is));String info;while((info = br.readLine())!=null) {System.out.println(info);}// 获得客户端IPInetAddress ia = socket.getInetAddress();String ip = ia.getHostAddress();System.out.println("客户端IP地址为："+ip);} catch (IOException e) {// TODO Auto-generated catch block
            e.printStackTrace();}}
}

package com.yh.mySocket;import java.io.IOException;
import java.io.OutputStream;
import java.net.Socket;
import java.net.UnknownHostException;public class LoginClient1 {public static void main(String[] args) {Socket socket = null;OutputStream os = null;try {// 创建一个客户端Socket，参数为客户端IP和指定端口号，此处客户端和服务器在同一台电脑，所以IP地址相同socket = new Socket("localhost",5000);// 通过输出流，给服务器发送请求os = socket.getOutputStream();String info = "用户名：YeHuan1; 密码：12345";byte[] infos = info.getBytes();os.write(infos);} catch (UnknownHostException e) {// TODO Auto-generated catch block
            e.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch block
            e.printStackTrace();} finally {try {os.close();socket.close();} catch (IOException e) {// TODO Auto-generated catch block
                e.printStackTrace();}}}
}

package com.yh.mySocket;import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;public class LoginServer {public static void main(String[] args) {ServerSocket serversocket = null;Socket socket = null;try {// 创建一个服务器Socketserversocket = new ServerSocket(5000);while(true) {// 使用accept()等待用户的通信socket = serversocket.accept();LoginThread lt = new LoginThread(socket);lt.start();}} catch (IOException e) {// TODO Auto-generated catch block
            e.printStackTrace();} finally {try {// 释放资源
                socket.close();serversocket.close();} catch (IOException e) {// TODO Auto-generated catch block
                e.printStackTrace();}}}
}