java tcp协议传输，客户端怎么判断，服务端有没有来消息...，通过循环读取响应流吗？

java tcp协议传输，客户端怎么判断，服务端有没有来消息...，通过循环读取响应流吗？

给你一个简单的例子，这样就是客户端不停的接收消息，你说的对，是通过循环在一直的读取。

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import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;

public class ScoketTest {
public static void main(String[] args) throws Exception {
new Server().start();
new Client().start();
}
}

class Server extends Thread {
private ServerSocket server = null;

public Server() throws Exception {
server = new ServerSocket(8888);
}

public void run() {
try {
while (true) {
Socket client = server.accept();
OutputStream out = client.getOutputStream();
out.write("server to client : hello".getBytes());
out.flush();
out.close();
client.close();
sleep(1000);
}

} catch (Exception e) {
System.out.println("server : " + e.getMessage());
}
}
}

class Client extends Thread {

public void run() {
try {
while (true) {
Socket client = new Socket("localhost", 8888);
InputStream in = client.getInputStream();
byte[] buff = new byte[4096];
StringBuffer sbuff = new StringBuffer();
int len = 0;
while ((len = in.read(buff)) != -1) {
sbuff.append(new String(buff, 0, len));
}
in.close();
client.close();
System.out.println(sbuff.toString());
sleep(1000);
}

} catch (Exception e) {
System.out.println("client : " + e.getMessage());
}
}
}

服务端和客户端都开启一个线程用于socket通信，服务端那边就建立一个serversocket，监听某个端口号，客户端那边则得在知道服务端ip的情况下，在之前那端口号下创建一个socket对象，并调用socket对象的写方法往服务端那边写数据，具体详情请搜索java socket通信

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