如何使用线程JAVA从套接字读取输入

Question

我正在编写一个简单的套接字编程应用程序，它使用一台服务器和一个客户端。我试图启动一个线程（从客户端文件中），从套接字输入流中读取输入，这样我就可以将消息写入服务器，同时读取并打印到屏幕上。然而，当我运行我的代码时，我的代码卡在

message = in.readLine();

在< code>InputReader.java文件中，读取无输入？

我的代码如下，请帮忙。

简单服务器1.java

public class SimpleServer1 {
public static void main(String args[]){
    int portNumber = Integer.parseInt(args[0]);

    ServerSocket serverSocket = null;
    Socket clientConnection = null;

    try{
        //setup sockets
        serverSocket = new ServerSocket(portNumber);
        clientConnection = serverSocket.accept();
        System.out.println("Connected to" + clientConnection.getInetAddress());

        //setup streams
        BufferedReader in = new BufferedReader(new InputStreamReader(clientConnection.getInputStream()));
        PrintWriter out = new PrintWriter(clientConnection.getOutputStream());
        out.flush();

        //read input from stream
        String message;
        while((message = in.readLine()) != null){
            //return message to client
            out.println("Echo: " + message);

            System.out.println(clientConnection.getInetAddress() + ": " + message);
            if (message.equalsIgnoreCase("bye")){
                System.out.println("Closing connection...");
                break;
            }
        }
        //close streams
        out.close();
        in.close();
        clientConnection.close();
    }catch(Exception e){
        e.printStackTrace();
    }
}

SimpleClient1.java

public class SimpleClient1{
public static void main(String args[]){
    String hostName = (args[0]);
    int portNumber = Integer.parseInt(args[1]);

    try{
        Socket serverConnection = new Socket(hostName, portNumber);
        PrintWriter out = new PrintWriter(serverConnection.getOutputStream(), true);
        out.flush();

        Thread listener = new Thread(new InputReader(serverConnection));
        listener.start();

        Scanner keyboard = new Scanner(System.in);
        String userInput;
        while((userInput = keyboard.nextLine()) != null){
            out.println(userInput);
            if (userInput.equalsIgnoreCase("bye")){
                break;
            }

        }
        //closing streams
        out.close();
        serverConnection.close();

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

输入读取器.java

public class InputReader implements Runnable{
private Socket serverConnection;
private BufferedReader in;
public InputReader(Socket socket){
    serverConnection = socket;
    try{
        in = new BufferedReader(new InputStreamReader(serverConnection.getInputStream()));
    }catch(IOException ioE){ioE.printStackTrace();}
}

@Override
public void run() {
    try{
        String message;
        while(true){
            System.out.println("done");
            message = in.readLine();
            System.out.println(message);
        }
    }catch(IOException ioE){ioE.printStackTrace();}

}

最终，我希望使用线程来读写套接字流。

提前致谢:)

科贝兹

Answer 1

在SimpleServer1.java中，必须添加.flush（）；

同时（（消息=in.readLine ()) ! = 空）{

out.println（"回声："消息）；

out.flush（）；

system . out . println(client connection . getine address()":" message)；

如果（message.equalsIgnoreCase（"再见"））{

系统输出。println（“正在关闭连接…”）；

打破；

}

}

Answer 2

我相信你必须在写信后冲洗你正在写的流。创建流后，您似乎会立即刷新流，这不会产生任何影响。