ObjectInputStream readObject（）：ClassNotFoundException [英] ObjectInputStream readObject(): ClassNotFoundException

问题描述

在客户端和服务器类中，我都有一个名为Data的完全相同的内部类。使用以下命令从服务器发送此Data对象：

In both client and server classes, I have an exact same inner class called Data. This Data object is being sent from the server using:

ObjectOutputStream output= new ObjectOutputStream(socket.getOutputStream());
output.writeObject(d);

（其中d是数据对象）

在客户端收到此对象并转换为Data对象：

This object is received on the client side and cast to a Data object:

ObjectInputStream input = new ObjectInputStream(socket.getInputStream());
Object receiveObject = input.readObject();
if (receiveObject instanceof Data){
    Data receiveData = (Data) receiveObject;
    // some code here... 
}

我得到了a $ code> java.lang.ClassNotFoundException：此行上的TCPServer $ Data Object receiveObject = input.readObject（）;

I'm getting a java.lang.ClassNotFoundException: TCPServer$Data on this line Object receiveObject = input.readObject();

我的猜测是它试图在服务器端寻找Data类而无法找到它，但我不确定...我该如何修复这个？

My guess is that it's trying to to look for the Data class in the Server side and can't find it, but I'm not sure... How do I fix this?

推荐答案

你要做的是以下几点：

class TCPServer {
    /* some code */

    class Data {

    }
}

class TCPClient {
    /* some code */

    class Data {

    }
}

然后，您正在序列化TCPServer $ Data并尝试将其反序列化为TCPClient $ Data。相反，你会想要这样做：

Then you are serializing a TCPServer$Data and trying to unserialize it as a TCPClient$Data. Instead you are going to want to be doing this:

class TCPServer {
    /* some code */

}

class TCPClient {
    /* some code */

}

class Data {
    /* some code */

}

然后确保数据类可用于客户端和服务器程序。

Then make sure the Data class is available to both the client and the server programs.

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