java在Client和Servet端进行自定义对象传输时注意要点

1. 必须在客户端和服务端各自创建一个被序列化的相同的类，类中的字段也必须相同，否则有些字段会访问不到
2. 必须把这两个类分别放在客户端与服务端具有相同包名的包下面，否则出现ClassNotFoundException异常或者ClassCastException异常
3. 如图

客户端代码：

package TCP;

import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.Socket;

import Public.Message;

public class client {

public static void main(String[] args ) throws Exception {
Socket socket = new Socket("127.0.0.1",9999);

ObjectOutputStream objOut = new ObjectOutputStream(socket.getOutputStream());

ObjectInputStream objIn = new ObjectInputStream(socket.getInputStream());

// objOut.writeObject("客户端来消息了");

Message message = new Message();
message.setAge(18);

objOut.writeObject(message);


}

}

服务端代码：

package webTest;

import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.ServerSocket;
import java.net.Socket;

import Public.Message;

public class Server {

public static void main(String[] args) throws Exception {

ServerSocket ssocket = new ServerSocket(9999);

Socket socket = ssocket.accept();

ObjectInputStream objIn = new ObjectInputStream(socket.getInputStream());

ObjectOutputStream objOut = new ObjectOutputStream(socket.getOutputStream());

objOut.writeObject("服务端来消息了");

Message message = new Message();
message = (Message) objIn.readObject();
System.out.println("message+"+message.getAge());


String str = (String)objIn.readObject();

System.out.println("str+"+str);



}

}

消息类：

package Public;

import java.io.Serializable;

public class Message implements Serializable{
/**
*
*/
private static final long serialVersionUID = 8625279621236358825L;
private int age;

public int getAge() {
return age;
}

public void setAge(int age) {
this.age = age;
}

}

Socket与Object流