transient关键字与序列化

一 介绍

transient关键字不会进行JVM虚拟机的序列化，但也可以自己进行序列化，要用到下面两个函数。这两个函数来自ArrayList源码，可以分析ArrayList源码的序列化和反序列化问题。这样做可以对有效元素进行序列化，不对无效元素进行序列化，以提高网络传输性能。

private void writeObject(java.io.ObjectOutputStream s)throws java.io.IOException

private void readObject(java.io.ObjectInputStream s) throws java.io.IOException, ClassNotFoundException

 

二 实例

package com.imooc.io;

 

import java.io.Serializable;

 

public class Student implements Serializable{

    private String stuno;

    private String stuname;

    //该元素不会进行jvm默认的序列化

    private transient int stuage; 

    

    public Student(String stuno, String stuname, int stuage) {

         super();

         this.stuno = stuno;

         this.stuname = stuname;

         this.stuage = stuage;

    }

 

    public String getStuno() {

         return stuno;

    }

    public void setStuno(String stuno) {

         this.stuno = stuno;

    }

    public String getStuname() {

         return stuname;

    }

    public void setStuname(String stuname) {

         this.stuname = stuname;

    }

    public int getStuage() {

         return stuage;

    }

    public void setStuage(int stuage) {

         this.stuage = stuage;

    }

    @Override

    public String toString() {

         return "Student [stuno=" + stuno + ", stuname=" + stuname + ", stuage="

                 + stuage + "]";

    }

}

 

package com.imooc.io;

 

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.ObjectInputStream;

import java.io.ObjectOutputStream;

 

public class ObjectSeriaDemo1 {

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

         String file = "demo/obj.dat";

         //1.对象的序列化

         ObjectOutputStream oos = new ObjectOutputStream(

                 new FileOutputStream(file));

         Student stu = new Student("10001", "张三", 20);

         oos.writeObject(stu);

         oos.flush();

         oos.close();

         ObjectInputStream ois = new ObjectInputStream(

                 new FileInputStream(file));

         Student stu1 = (Student)ois.readObject();

         System.out.println(stu1);

         ois.close(); 

    }

}

 

三 运行结果

Student [stuno=10001, stuname=张三, stuage=0]