JAVA序列化和反序列化 对象<=>IO流 对象<=>字节数组

http://developer.51cto.com/art/201202/317181.htm

http://blog.csdn.net/earbao/article/details/46914407

package com.cmy.demo;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

import com.cmy.serial.Student;

public class UserStudent {

    /**
     * @param args
     * @throws IOException
     * @throws ClassNotFoundException
     */
    public static void main(String[] args) throws IOException, ClassNotFoundException {

        Student st = new Student("Tom",'M',20,3.6);
        File file = new File("C:\\YiKiChen\\pacho\\student.txt");
        try {
            file.createNewFile();
        } catch (Exception e) {
            e.printStackTrace();
        }
        //序列化 对象转换成io流
        try {
            FileOutputStream fos = new FileOutputStream(file);
            ObjectOutputStream oos = new ObjectOutputStream(fos);
            oos.writeObject(st);
            oos.flush();
            oos.close();
            fos.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

        // 反序列 io转换成对象
        try {
            FileInputStream fis = new FileInputStream(file);
            ObjectInputStream ois = new ObjectInputStream(fis);
            Student st1 = (Student)ois.readObject();
            System.out.println(st1.getName());
            System.out.println(st1.getGpa());
            System.out.println(st1.getSex());

        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }

     /**
     * 对象转数组
     * @param obj
     * @return
     */
    public byte[] toByteArray (Object obj) {
        byte[] bytes = null;
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        try {
            ObjectOutputStream oos = new ObjectOutputStream(bos);
            oos.writeObject(obj);
            oos.flush();
            bytes = bos.toByteArray ();
            oos.close();
            bos.close();
        } catch (IOException ex) {
            ex.printStackTrace();
        }
        return bytes;
    }   

    /**
     * 数组转对象
     * @param bytes
     * @return
     */
    public Object toObject (byte[] bytes) {
        Object obj = null;
        try {
            ByteArrayInputStream bis = new ByteArrayInputStream (bytes);
            ObjectInputStream ois = new ObjectInputStream (bis);
            obj = ois.readObject();
            ois.close();
            bis.close();
        } catch (IOException ex) {
            ex.printStackTrace();
        } catch (ClassNotFoundException ex) {
            ex.printStackTrace();
        }
        return obj;
    }   

}