应用java多线程实现服务器端与多客户端之间的通信

时间:2022-07-11 22:15:39

应用多线程来实现服务器与多线程之间的通信的基本步骤

1、服务器端创建ServerSocket,循环调用accept()等待客户端链接

2、客户端创建一个Socket并请求和服务器端链接

3、服务器端接受客户端请求,创建socekt与该客户端建立专线链接

4、建立链接的socket在一个单独的线程上对话

5、服务器继续等待新的链接

服务器端Server.java
package test.concurrent.socket;

import java.io.*;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;

/**
* Created by dong on 15-6-22.
* 基于TCP协议的Socket通信,实现用户登录
* 服务器端
*/
public class Server {

public static void main(String[] args) {

try {
//1、创建一个服务器端Socket,即ServerSocket, 指定绑定的端口,并监听此端口
ServerSocket serverSocket = new ServerSocket(8888);
Socket socket = null;
//记录客户端的数量
int count = 0;
System.out.println("***服务器即将启动,等待客户端的链接***");
//循环监听等待客户端的链接
while (true){
//调用accept()方法开始监听,等待客户端的链接
socket = serverSocket.accept();
//创建一个新的线程
ServerThread serverThread = new ServerThread(socket);
//启动线程
serverThread.start();

count++; //统计客户端的数量
System.out.println("客户端的数量: " + count);
InetAddress address = socket.getInetAddress();
System.out.println("当前客户端的IP : " + address.getHostAddress());
}

} catch (IOException e) {
e.printStackTrace();
}
}
}
服务器端线程处理类ServerThread.java
package test.concurrent.socket;

import java.io.*;
import java.net.Socket;

/**
* Created by dong on 15-6-22.
* 服务器端线程处理类
*/
public class ServerThread extends Thread {

//和本线程相关的Socket
Socket socket = null;
public ServerThread(Socket socket){
this.socket = socket;
}

//线程执行的操作,响应客户端的请求
public void run(){

InputStream is = null;
InputStreamReader isr = null;
BufferedReader br = null;

OutputStream os = null;
PrintWriter pw = null;
try {

//获取一个输入流,并读取客户端的信息
is = socket.getInputStream();
isr = new InputStreamReader(is); //将字节流转化为字符流
br = new BufferedReader(isr); //添加缓冲
String info = null;
//循环读取数据
while ((info = br.readLine()) != null){
System.out.println("我是服务器,客户端说: " +info);
}

socket.shutdownInput(); //关闭输入流

//获取输出流,响应客户端的请求
os = socket.getOutputStream();
pw = new PrintWriter(os); //包装为打印流
pw.write("欢迎你");
pw.flush(); //将缓存输出


} catch (IOException e) {
e.printStackTrace();
}finally {


try {
//关闭资源
if (pw != null)
pw.close();
if (os != null)
os.close();
if (is != null)
is.close();
if (isr != null)
isr.close();
if (br != null)
br.close();
if (socket != null)
socket.close();
} catch (IOException e) {
e.printStackTrace();

}

}



}
}
客户端Client.java
package test.concurrent.socket;

import java.io.*;
import java.net.Socket;

/**
* Created by dong on 15-6-22.
* 客户端
*/
public class Client {

public static void main(String[] args) {

try {
//1、创建客户端Socket,指定服务器端口号和地址
Socket socket = new Socket("localhost",8888);
//2、获取输出流,向服务器发送信息
OutputStream os = socket.getOutputStream(); //字节输出流
PrintWriter pw = new PrintWriter(os); //将输出流包装为打印流
pw.write("用户名:tom; 密码:456");
pw.flush();
socket.shutdownOutput(); //关闭输出流

InputStream is = socket.getInputStream();
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);

String info = null;
//循环读取
while ((info = br.readLine()) != null){
System.out.println("我是客户端:服务器说:" + info);
}

br.close();
is.close();
isr.close();


pw.close();
os.close();
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}