java - 如何通过 Java 套接字（Java 网络）发送对象并读取它

Question

我想使用 java 网络制作聊天应用程序。到目前为止，我已经在两个不同的项目中创建了服务器和客户端类，并且它们每个都有相同的 Message 类：

package client;

import java.io.Serializable;

public class Message implements Serializable {

public static final long serialVersionUID = 1l;

private String text;
private int receiversID;
private int senderID;

public Message(String text, int receiversID, int senderID){
    this.text = text;
    this.receiversID = receiversID;
    this.senderID = senderID;
}

public String getText() {
    return text;
}

public int getReceiversID() {
    return receiversID;
}

public int getSenderID() {
    return senderID;
}

比我在客户端类中发送这样的消息：

            do {
            System.out.print("Enter message to be sent: ");
            text = scanner.nextLine();
            System.out.print("Enter receivers ID: ");
            receiverID = scanner.nextInt();

            outputStream.writeObject(new Message(text, receiverID, ID)); // sending message
            outputStream.flush();

            if (!text.equals("exit")) {
                try {
                    Message message = (Message) inputStream.readObject();
                    System.out.print(message.getText() + "\n");
                } catch (ClassNotFoundException e) {
                    e.printStackTrace();
                }

            }
        } while (!text.equals("exit"));

当我想在我的服务器项目中获取该消息时发生错误：

        Message message = (Message) inputStream.readObject();

我明白了：

java.lang.ClassNotFoundException: client.Message
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:683)
at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1863)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1746)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2037)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1568)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:428)
at network.ClientSockets.run(ClientSockets.java:57)

我知道服务器项目无法识别来自客户端的 Message 类，尽管它们是相同的类，但我真的不知道如何解决这个问题。

有谁知道解决方案？

标签： javasocketsinputstreamclassnotfoundexceptionoutputstream