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;    
    }   


}