客户端-服务器程序不工作

Question

我是java的新手。我想进行服务器-客户端套接字编程。这里客户端发送消息，服务器回复消息。我写了以下代码：

Client.java

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

class Client 
{
    public static void main(String[] args) 
    {
        try
        {
            String host = "localhost";
            Socket socket = new Socket(host,25000);

            OutputStream os = socket.getOutputStream();

            OutputStreamWriter osw = new OutputStreamWriter(os);

            BufferedWriter bufferedwriter = new BufferedWriter(osw);
            String sendMessage = "hello from Client";

            bufferedwriter.write(sendMessage);
            // bufferedwriter.flush();

            InputStream is = socket.getInputStream();

            InputStreamReader isr = new InputStreamReader(is);

            BufferedReader br = new BufferedReader(isr);

            String input = br.readLine();

            System.out.println("The message recieved from server is : "+ input);
            socket.close();


        }
        catch (Exception e) {
            e.printStackTrace();
        }



    }
}

Server.java

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

class Server 
{
    private static Socket socket;
    public static void main(String[] args) 
    {
        try 
        {
            ServerSocket serverSocket = new ServerSocket(25000);
            System.out.println("Server started listening at port 25000");
            socket = serverSocket.accept();

            InputStream is = socket.getInputStream();

            InputStreamReader isr = new InputStreamReader(is);

            BufferedReader br = new BufferedReader(isr);

            String input = br.readLine();

            System.out.println("The message recieved from client is : "+ input);


            OutputStream os = socket.getOutputStream();

            OutputStreamWriter osw = new OutputStreamWriter(os);

            BufferedWriter bufferedwriter = new BufferedWriter(osw);
            String sendMessage = "hello from Server";

            bufferedwriter.write(sendMessage);
            bufferedwriter.flush();


            socket.close();
        }
        catch(Exception e)
        {
            e.printStackTrace();
        }
    }
}

程序的输出如下所示：

roomno311@thedestiny:~/Desktop/java$ java Server Server started listening at port 25000 roomno311@thedestiny:~/Desktop/java$ java Client

上面的代码中间挂了。我需要按 Ctrl + C 来关闭这些程序。请帮我解决这个问题。

Answer 1

客户端程序中的 readLine 语句需要从服务器发送以换行符 \n 字符终止的相应字符串。

Answer 2

由于您使用的是 BufferedWriter，因此您也可以像这样使用 newLine 方法。

在您的客户端中，之后：String sendMessage = "hello from Client";

使用：

bufferedwriter.write(sendMessage);
bufferedwriter.newLine();
bufferedwriter.flush();

同样在您的服务器代码之后：String sendMessage = "hello from Server";

用户：

bufferedwriter.write(sendMessage);
bufferedwriter.newLine();
bufferedwriter.flush();

客户端-服务器程序不工作

Client-Server Program does not work

java

sockets

network-programming