EchoServer (Java) 没有将消息返回给客户端 (golang)

Question

我正在尝试创建一个 TCP 客户端（golang）服务器（Java）应用程序，客户端在其中写入，服务器回显此文本并将 returns 消息返回给客户端，随后回应回复。

服务器代码(Java):

public static void main(String[] args) throws Exception {

    int port = 4444;
    ServerSocket serverSocket = new ServerSocket(port);
    System.err.println("Started server on port " + port);

    while (true) {
        Socket clientSocket = serverSocket.accept();
        System.err.println("Accepted connection from client");

        BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));

        PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true);
        String s;
        while ((s = in.readLine()) != null) {
            out.println(s);
            System.out.println(s);

        }

        System.err.println("Closing connection with client");
        out.close();
        in.close();
        clientSocket.close();
    }
}

客户端代码(golang):

package main

import (
    "net"
    "os"
)

func main() {
    strEcho := "Hello"
    servAddr := "localhost:4444"
    tcpAddr, err := net.ResolveTCPAddr("tcp", servAddr)
    if err != nil {
        println("ResolveTCPAddr failed:", err.Error())
        os.Exit(1)
    }

    conn, err := net.DialTCP("tcp", nil, tcpAddr)
    if err != nil {
        println("Dial failed:", err.Error())
        os.Exit(1)
    }

    _, err = conn.Write([]byte(strEcho))
    if err != nil {
        println("Write to server failed:", err.Error())
        os.Exit(1)
    }

    println("write to server = ", strEcho)

    reply := make([]byte, 1024)
    _, err = conn.Read(reply)

    if err != nil {
        println("Write to server failed:", err.Error())
        os.Exit(1)
    }

    println("reply from server=", string(reply))

    conn.Close()
}

当我启动 Java 服务器然后运行 Go 应用程序时，服务器说连接已被接受（即 "Accepted connection from client"）但从未 returns回声返回给客户端。客户端在 "write to server = Hello" 上停止，即写入服务器工作正常，但读回客户端则不然。知道为什么会这样吗？

Answer 1

尝试发送一个换行符来匹配服务器端的readLine语句

strEcho := "Hello\n"

EchoServer (Java) 没有将消息返回给客户端 (golang)

EchoServer (Java) not returning message back to client (golang)

java

tcp

go

tcpclient

tcpserver