TCP程序中的問題（Java）

Question

任何人都可以幫我調試這個程序嗎？

以下是服務器代碼：

package networking;

import java.io.IOException;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;

class TcpServer {
    public static void main(String[] args) throws IOException {
        ServerSocket serverSocket = new ServerSocket(5555);
        while (true) {
            Socket client = serverSocket.accept();
            Scanner reader = new Scanner(client.getInputStream());
            PrintWriter writer = new PrintWriter(client.getOutputStream());
            String inputString = reader.nextLine();
            System.out.println("Received from client : " + inputString);
            writer.write(inputString.toUpperCase());
            client.close();
        }
    }
}

這是客戶端代碼：

package networking;

import java.io.PrintWriter;
import java.io.IOException;
import java.net.Socket;
import java.util.Scanner;

class TcpClient {
    public static void main(String[] args) throws IOException {
        Socket client = new Socket("localhost", 5555);
        PrintWriter writer = new PrintWriter(client.getOutputStream());
        Scanner reader=new Scanner(client.getInputStream());
        writer.println("oPen SOurCe RUleS !");
        System.out.println("Received from server : "+reader.nextLine());
        client.close();
    }
}

問題是當我運行這個程序時，客戶端和服務器都進入無限期等待狀態。有人能告訴我這段代碼有什么問題嗎？

提前致謝！

Answer 1

你試過Flushing the PrintWriter嗎？

您關閉了流，但您從未通知作者您將要這樣做。