如何在Java中通过TCP发送OBJECT？ [英] How to send an OBJECT over TCP in java?

问题描述

我正在编写一个程序，将对象从一个类发送到另一个类。这里是我的程序的一个简短的示例来表示问题。正如你可以看到，要从服务器发送到客户端的对象是Student类，它已经在每个类（服务器/客户端）中单独定义。我已经通过发送一个ArrayList来检查这个代码，它来到一个类类型，我自己定义我收到这个错误：

I'm writing a program to send an object from one class to another class. Here is a short sample example of my program to represent the problem. As you can see the object to send from server to client is Student class which has been defined separately in each class(Server/Client). I have examined this code by sending an ArrayList which works fine but when it comes to a class type which defined by myself i'm receiving this error:

Exception in thread "main" java.lang.ClassCastException: ServerSide$1Student cannot be cast to ClientSide$1Student
    at ClientSide.main(ClientSide.java:29)

这是服务器端的代码：

import java.io.*;
import java.net.*;

public class ServerSide {

    public static void main(String[] args) {
        class Student implements Serializable
        {
            int id;
            public Student(int num){id=num;}
            public void setID(int num){id=num;}
            public void Print(){System.out.println("id = " + id);}
        }
        try
        {
            Student a = new Student(3);
            ServerSocket myServerSocket = new ServerSocket(9999);
            Socket skt = myServerSocket.accept();   
            try 
            {
                ObjectOutputStream objectOutput = new ObjectOutputStream(skt.getOutputStream());
                objectOutput.writeObject(a);                
            } 
            catch (IOException e) 
            {
                e.printStackTrace();
            } 
        }
        catch (IOException e) 
        {
            e.printStackTrace();
        }
    }
}

：

import java.io.*;
import java.net.Socket;
import java.net.UnknownHostException;

public class ClientSide {

    public static void main(String[] args)
    {
        class Student implements Serializable
        {
            int id;
            public Student(int num){id=num;}        
            public void setID(int num){id=num;}
            public void Print(){System.out.println("id = " + id);}
        }
        try {       
            Socket socket = new Socket("10.1.1.2",9999);
            try {
                ObjectInputStream objectInput = new ObjectInputStream(socket.getInputStream());
                try {
                    Object object =(Student) objectInput.readObject();
                    Student tmp = (Student) object;
                    tmp.Print();
                } catch (ClassNotFoundException e) {
                    e.printStackTrace();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }           
        } catch (UnknownHostException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }   
    }   
}

/ strong>

我将它们移动到同一个文件并添加了序列ID。

推荐答案

有两个同名的类是不够的。这两个类需要具有

Having two classes with the same name is not enough. The two classes need to have

• 同一个包




• 有相同的serialVersionUID。

我建议你有一个单独的对于客户端和服务器都是通用的。在一个更复杂的项目中，您可以考虑在客户端和服务器模块依赖的模块中构建这些公共组件。

I suggest you have a single, stand alone class which is common for both the client and the server. In a more complex project you might consider building these common components in a module which both the client and server modules depend on.

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