java.io.NotSerializableException

Question

是一个简单的客户端收集数据再传送给服务器端的的程序

客户端：
import javafx.scene.control.Alert;
import javafx.scene.control.TextField;

import javax.swing.*;

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.*;
import java.net.Socket;
import java.net.UnknownHostException;

public class MainFrame extends JFrame {
    private String serverIP;
    public Socket socket;
    //主面板
    private JPanel p;
    //声明组件
    private JLabel id,name,age,eclass,grade;
    //声明五个文本框文本框
    private JTextField tid,tname,tage,tclass,tgrade;
    //声明两个按钮
    private JButton btyes,btremove;
    private JTextArea txt;

   
        btyes.addActionListener(new RegisterListener());
        btremove.addActionListener(new ResetListener());

        //组件放入小面板小面板放在主面版
        
    //监听类
    //确定按钮的监听时间，当确定之后开始获取用户输入的数据，并创建客户端连接服务器发送数据
    public class RegisterListener implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            //获取用户输入数据
            // 学生对象，放入数据，准备发送
            Student stu = new Student();
            stu.setId(Integer.parseInt(tid.getText().trim()));
            stu.setName(tname.getText().trim());
            stu.setAge(Integer.parseInt(tage.getText().trim()));
            stu.setEclass(tclass.getText().trim());
            stu.setGrade(tgrade.getText().trim());
            try {
                if (stu != null) {
                    //创建连接到本机端口号为28888的socket对象
                    Socket stusocket = new Socket(serverIP, 28888);
                    //创建用于序列化匹配日志信息对象的输出流
                    ObjectOutputStream outstream = new ObjectOutputStream(stusocket.getOutputStream());
                    //向流中写入学生信息
                    outstream.writeObject(stu);
                    outstream.flush();
                    outstream.close();
                    JOptionPane.showMessageDialog(null, "匹配的学生信息已经发送到服务器！");
                } else {
                    JOptionPane.showMessageDialog(null, "信息填写错误！");
                }
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
    }

    public class ResetListener implements ActionListener {
        @Override
        public void actionPerformed(ActionEvent e) {
            tid.setText("");
            tname.setText("");
            tage.setText("");
            tclass.setText("");
            tgrade.setText("");
        }
    }
    public static void main(String[] args) {
        new MainFrame();
    }

}

服务器端的代码：
public class Serverdemo {
    public  Serverdemo() {
        new AcceptServer(28888).start();
        System.out.println("服务器已开启....");
    }

    //接收数据的线程类
    private class AcceptServer extends Thread {
        private ServerSocket serverSocket;
        private Socket socket;
        private Student student2;
        private ObjectInputStream ois;

        public AcceptServer(int port) {
            try {
                serverSocket = new ServerSocket(port);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        //重写run方法，将数据保存到数据库中
        public void run() {
            while (this.isAlive()) {
                try {
                    //接收来自客户端的套接字
                    socket = serverSocket.accept();
                    if (socket != null) {
                        ois=new ObjectInputStream(socket.getInputStream());
                        //反序列化，我要写代码写一万行我要写一万行把代码写烂！！！
                        ObjectInputStream outstream2=new ObjectInputStream(ois);
                        student2=(Student) outstream2.readObject();
                        if (saveStu(student2)) {
                            System.out.println("注册成功！");
                        } else {
                            System.out.println("注册失败！");
                        }
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }

        public boolean saveStu(Student stu) {
            boolean r = false;
            DBUtil db = new DBUtil();
            try {
                db.getConnection();
                String sql = "INSERT INTO student VALUES(?,?,?,?,?)";
                Object[] p = new Object[]{stu.getId(), stu.getName(), stu.getAge(), stu.getEclass(), stu.getGrade()};
                if (db.executeUpdate(sql, p) > 0) {
                    r = true;
                }
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                db.closeAll();
            }
            return r;
        }

    }

    public static void main(String[]args){
        new Serverdemo();
    }
}

Answer 1

JDK 自带的序列化方式要求类实现 Serializable 接口，
针对你的问题，Student 类实现 Serializable 接口即可。

public class Student implements Serializable{

}

关于序列化的更多内容，你还可以参考 Java 核心技术之序列化 Serializable_zzuhkp的博客-CSDN博客