ObjectInputStream 判断文件结束解决办法

import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.ObjectOutputStream;import com.kevinb.io.bean.User;public class ObjectOutputStreamModel {    private static void writeObjectFile(){        String sourceFile = "src/com/kevinb/io/objectStream/userFile";        File file = new File(sourceFile);        try {            FileOutputStream fiOutputStream = new FileOutputStream(file);            ObjectOutputStream objectOutputStream = new ObjectOutputStream(fiOutputStream);            //开始准备插入对象            User user1 = new User();            user1.setUserId(1);            user1.setUserName("Kevinb");            user1.setPassword("ffffff");            objectOutputStream.writeObject(user1);                        User user2 = new User();            user2.setUserId(2);            user2.setUserName("Jone");            user2.setPassword("11");            objectOutputStream.writeObject(user2);                        //写入结束标志方便读取（非常重要，如果不写入，在读取的时候无法定位读取结束）；            objectOutputStream.writeObject(null);            //close outputStream            objectOutputStream.close();        } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }        System.out.println("对象写入成功！");    }        public static void main(String[] args) {        writeObjectFile();    }}