java socket 通信二_socket manyclientmany-优快云博客

本文链接：https://blog.youkuaiyun.com/csdn_yang123/article/details/53081683

本文介绍如何使用 Java Socket 和多线程实现多客户端与服务端的通信。通过创建 ServerSocket 监听指定端口并接受来自多个客户端的连接请求，为每个客户端分配独立线程处理数据收发。客户端通过 Socket 向服务端发送消息，服务端接收并响应。

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1.上一遍java socket 是单对单通信，那么如果有多个客户端访问服务端怎么办？这时候就要用到多线程了，在java socket 一的基础上进行改造。

2.服务端：

public class ServerTest {
protected static final int PORT = 6666; // 端口号

public static void main(String[] args) {
try {
ServerSocket serverSocket = new ServerSocket(ServerTest.PORT);
while (true) {
Socket socket = serverSocket.accept();// 会阻塞请求
ManyClient client = new ManyClient(socket);
client.start();
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}

3.ManyClient 的内容：

public class ManyClient extends Thread {
private Socket socket;

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

@Override
public void run() {
// TODO Auto-generated method stub
super.run();
BufferedReader br = null;
PrintWriter pw = null;
try {
br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())));
while (true) {
String str = br.readLine();
System.out.println(str);
pw.flush();
if (str.equals("end")) {
System.out.println("结束");
socket.close();
break;
}
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
try {
br.close();
pw.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}

}

4.客户端：

public class ClientTest {
private static final String host = "";

public static void main(String[] args) {
clientA();
clientB();
}

private static void clientA() {
BufferedReader br = null;
PrintWriter pw = null;
try {
Socket socket = new Socket(host, ServerTest.PORT);
br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())));
for (int i = 0; i < 5; i++) {
pw.println("A发送消息:在吗?" + i);
pw.flush();
}
pw.println("end");
pw.flush();
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
try {
pw.close();
br.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}

private static void clientB() {
BufferedReader br = null;
PrintWriter pw = null;
try {
Socket socket = new Socket(host, ServerTest.PORT);
br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())));
for (int i = 0; i < 5; i++) {
pw.println("B发送消息:在吗?" + i);
pw.flush();
}
pw.println("end");
pw.flush();
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
try {
pw.close();
br.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}

5.ok 运行之后