为什么我的服务器响应打印错误？

Question

我正在攻读考试，正在研究以下示例问题。我有一个简单的服务器，我试图与客户端连接。连接工作正常，但由于某种原因，这是我在客户端控制台中获得的输出。谁能告诉我为什么会这样？

注意：我也可以从客户端访问Message类（我没有这样做，因为我不知道这有什么用，但我认为这是解决这个问题的关键）如果有人可以提出如何做的建议。

此外，我所做的任何更改都必须是客户端的代码。服务器端代码无法更改。我也在下面附上了我的代码。感谢

public class Client {
public static void main(String[] args) throws IOException {
    Socket s = new Socket("localhost", 8999); // create a new socket
    InputStream instream = s.getInputStream(); // Create input Stream obkect
    OutputStream outstream = s.getOutputStream(); // Create output stream
                                                    // object
    Scanner in = new Scanner(instream); // Create scanner object that takes
                                        // the instream as an argument
    PrintWriter out = new PrintWriter(outstream); // Create a printwriter
                                                    // outstream object

    String request="GET / HTTP/1.0\n\n";
    out.print(request); // pass the request to the outstream
    out.flush(); // moves all the data to the destination
    String response = in.nextLine(); // response is the next line in the
                                        // input stream
    System.out.println("Receiving: " + response); // Print statement

    s.close(); // close the socket
}
}


public class TimeServer {

private static Date currentDateAndTime() {
    return new Date();
    // (An object of class Date comprises time and date)
}

public static void main(String[] args) {
    try {
        ServerSocket serverSocket = new ServerSocket(8999);
        while (true) {
            Socket socket = serverSocket.accept();
            try {
                ObjectOutputStream stream = new ObjectOutputStream(
                        socket.getOutputStream());
                Date dt = currentDateAndTime();
                Message m = new Message(dt);
                stream.writeObject(m);
                stream.close();
            } catch (IOException e) {
                System.out.println(e.getMessage());
            }
            try {
                socket.close();
            } catch (IOException e) {
                System.out.println(e.getMessage());
            }
        }
    } catch (IOException e) {
        System.out.println(e.getMessage());
    }
}
}


class Message implements Serializable { 
//This helper class can be used both by server and client code 

Date timeAndDate; 
// (Objects of class Date comprise time & date) 

Message(Date timeAndDate) { 
this.timeAndDate = timeAndDate; 
} 

}

Answer 1

您只需要修改客户端：

Scanner in = new Scanner(instream); // Create scanner object that takes
                                    // the instream as an argument

替换为

ObjectInputStream in = new ObjectInputStream(instream); 

同时修复输入流的读取，替换：

String response = in.nextLine();
System.out.println("Receiving: " + response);

使用：

Message response = (Message) in.readObject();
System.out.println("Receiving: " + response.timeAndDate);