Question

最近我一直在研究套接字通信，在我阅读了一些教程后，我发现了类似的内容。

public class Server{

    public static void main(String[] args) throws IOException, InterruptedException {
        ServerSocket server = new ServerSocket(9999);
        Socket socket = server.accept();
        PrintWriter out = new PrintWriter(socket.getOutputStream(), true);
        BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
        String message = "";
        int ch = -1;
        while((ch=in.read())!= -1 ){
            message+=ch;
        }
    //  String message = in.readLine();
        System.out.println("RECEIVED "+message);
        out.write("RESPONSE "+message+"\n");
        out.flush();

        System.out.println("NEW MESSAGE SEND");
        Thread.sleep(3000);
        System.out.println("CLOSE");
        server.close();
    }

}

public class Client {

    public static void main(String[] args) throws UnknownHostException, IOException {
        Socket socket = new Socket("127.0.0.1", 9999);
        PrintWriter out = new PrintWriter(socket.getOutputStream(), true);

        out.write("MESSAGE\n");
        out.flush();
        System.out.println("SEND MESSAGE");
        BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
        System.out.println(in.readLine());
        socket.close();
    }

}

运行此代码后，Client会在服务器挂起"SEND MESSAGE"时记录in.read()，并且不会收到任何消息。任何人都可以帮我解释一下我做错了什么吗？

Answer 1

您的服务器正在从套接字读取，直到流结束。仅当对等方关闭连接时才会发生流结束。此时您将无法发送回复。您需要重新考虑您的协议。举个简单的例子，你可以像在客户端一样一次一个地读写行。

如何进行套接字通信？

1 个答案: