不会在Java套接字中读取任何内容

Question

我创建了一个简单的服务器和一个客户端，但是服务器无法读取从客户端发送的任何内容。发送字符串后，我还添加了一条打印语句，但也无法打印。

public class Server {
                public static void main(String[] args) throws IOException, ClassNotFoundException {
                    ServerSocket serverSocket = new ServerSocket(6666);

                    Socket clientSocket = serverSocket.accept();
                    System.out.println("accepting client at address " + clientSocket.getRemoteSocketAddress());
                    ObjectInputStream in = new ObjectInputStream(clientSocket.getInputStream());
                    ObjectOutputStream out = new ObjectOutputStream(clientSocket.getOutputStream());

                    String input = (String) in.readObject();
                    System.out.println(input);
                    out.writeObject("Received");
                    out.flush();
                }
}

下面是客户端，我只想发送一个字符串“ ??????不发送”：

 public class Test {

        public static void main(String[] args) throws IOException, ClassNotFoundException {
            Client client = new Client();
            client.sentInfo();
        }

        private static class Client {

            private ObjectInputStream objectInputStream;
            private ObjectOutputStream objectOutputStream;

            public Client() throws IOException {
                Socket socket = new Socket("127.0.0.1", 6666);
                this.objectInputStream = new ObjectInputStream(socket.getInputStream());
                this.objectOutputStream = new ObjectOutputStream(socket.getOutputStream());
            }

            public void sentInfo() throws IOException, ClassNotFoundException {
                this.objectOutputStream.writeObject("?????does not send");
                this.objectOutputStream.flush();
                System.out.println("????????");
                Message resp = (Message) this.objectInputStream.readObject();
                System.out.println(resp.getMessage());
            }

        }
 }

Answer 1

要从套接字读取字符串，请使用类似以下内容：

DataInputStream input = new DataInputStream(clientSocket.getInputStream());
String message = input.readUTF();

您可以从一个套接字打开多个流，因此，如果您想读取其他真正需要ObjectInputStream的内容，那么也可以将其打开。不要忘记正确关闭流和套接字。