用java将对象从客户端发送到服务器

如何用java将对象发送到服务器

客户：

    Help h = new Help("Mattia Cammalleri","Informatica","18 Novembre 2020");
    
    Socket s = new Socket("localhost", 8888);
    ObjectOutputStream os = new ObjectOutputStream(s.getOutputStream()); 
    ObjectInputStream is = new ObjectInputStream(s.getInputStream());
    os.writeObject(h);
    os.flush();

    Help h = new Help("Mattia Cammalleri","Informatica","18 Novembre 2020");
    Socket socket = new Socket("localhost", 7777);
    System.out.println("Connected");
    OutputStream outputStream = socket.getOutputStream();
    ObjectOutputStream objectOutputStream = new ObjectOutputStream(outputStream);
    System.out.println("The object has been sent");
    objectOutputStream.writeObject(h);
    socket.close();

服务器：

    ServerSocket ss = new ServerSocket(8888);
    Socket s = ss.accept(); 
    ObjectOutputStream os = new ObjectOutputStream(s.getOutputStream()); 
    ObjectInputStream is = new ObjectInputStream(s.getInputStream());
    Help h = (Help) is.readObject();
    System.out.println("Richiesta " + h);

    ServerSocket ss = new ServerSocket(7777);
    System.out.println("Waiting for the client");
    Socket socket = ss.accept();
    System.out.println("Connected from " + socket + "!");
    InputStream inputStream = socket.getInputStream();
    ObjectInputStream objectInputStream = new ObjectInputStream(inputStream);
    Help h = (Help) objectInputStream.readObject();
    System.out.println("Object: " + h);
    ss.close();
    socket.close();

对象（实现可序列化）：

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为什么它不起作用？

我是这样解决的：

客户：

    Help h = new Help("Mattia Cammalleri","Informatica","18 Novembre 2020");
    
    Socket s = new Socket("localhost", 8888);
    ObjectOutputStream os = new ObjectOutputStream(s.getOutputStream()); 
    ObjectInputStream is = new ObjectInputStream(s.getInputStream());
    os.writeObject(h);
    os.flush();

    Help h = new Help("Mattia Cammalleri","Informatica","18 Novembre 2020");
    Socket socket = new Socket("localhost", 7777);
    System.out.println("Connected");
    OutputStream outputStream = socket.getOutputStream();
    ObjectOutputStream objectOutputStream = new ObjectOutputStream(outputStream);
    System.out.println("The object has been sent");
    objectOutputStream.writeObject(h);
    socket.close();

服务器：

    ServerSocket ss = new ServerSocket(8888);
    Socket s = ss.accept(); 
    ObjectOutputStream os = new ObjectOutputStream(s.getOutputStream()); 
    ObjectInputStream is = new ObjectInputStream(s.getInputStream());
    Help h = (Help) is.readObject();
    System.out.println("Richiesta " + h);

    ServerSocket ss = new ServerSocket(7777);
    System.out.println("Waiting for the client");
    Socket socket = ss.accept();
    System.out.println("Connected from " + socket + "!");
    InputStream inputStream = socket.getInputStream();
    ObjectInputStream objectInputStream = new ObjectInputStream(inputStream);
    Help h = (Help) objectInputStream.readObject();
    System.out.println("Object: " + h);
    ss.close();
    socket.close();

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到底是什么不起作用？你有例外吗？您的控制台从

System.out.println（）

的输出是什么？这在客户端，线程“main”java.net中出现异常。连接异常：连接被拒绝：当您启动客户端时，服务器端是否正在运行？是的，我不知道是什么问题吗？嗯，您是否尝试禁用防火墙？也可以尝试其他端口。