序列化小复习

想要序列化一个对象则需要使其继承serializable或者externalizable接口

一下是一个实例小程序：

ser_test

 1 import java.io.*;
 2 
 3 public class ser_test{
 4     public static void main(String[] args) throws Exception{
 5         person p1 = new person(1,1.2,"A");
 6         FileOutputStream fos = new FileOutputStream("/person.txt");
 7         ObjectOutputStream oos = new ObjectOutputStream(fos);
 8         oos.writeObject(p1);
 9         oos.close();
10         fos.close();
11         System.out.println("output over!");
12     }
13 }
14 
15 class person implements Serializable{
16     int age;
17     double height;
18     String name;
19     person(){}
20     person(int age,double height,String name){
21         this.age = age;
22         this.height = height;
23         this.name = name;
24     }
25 }

实验结果：

在根目录下的person.txt文件中有如下内容

输出流把person对象的内容以二进制形式写到txt中，所以是乱码，但是还是能从中看到一些person的痕迹。

接下来

在以上内容中增加输入流把文件中的内容读取出来并在控制台显示

View Code

 1 import java.io.*;
 2 
 3 public class ser_test{
 4     public static void main(String[] args) throws Exception{
 5         person p1 = new person(1,1.2,"A");
 6         FileOutputStream fos = new FileOutputStream("/person.txt");
 7         ObjectOutputStream oos = new ObjectOutputStream(fos);
 8         oos.writeObject(p1);
 9         oos.close();
10         fos.close();
11         System.out.println("output over!");
12         
13         
14         FileInputStream fis = new FileInputStream("/person.txt");
15         ObjectInputStream ois = new ObjectInputStream(fis);
16         person p2 = (person)ois.readObject();
17         System.out.println("person = " + "age :" + p2.age + "  height :" + p2.height + "  name : " + p2.name);
18         System.out.println("output over!");
19     }
20 }
21 
22 class person implements Serializable{
23     int age;
24     double height;
25     String name;
26     person(){}
27     person(int age,double height,String name){
28         this.age = age;
29         this.height = height;
30         this.name = name;
31     }
32 }

结果：

读取完毕！

在序列化是需要注意的是如果对象中的变量有static 或者transient修饰的话序列化时这部分不能序列化。

将上面程序中的person类稍作修改：

 1 class person implements Serializable{
 2     static int age;
 3     transient double height;
 4     String name;
 5     person(){}
 6     person(int age,double height,String name){
 7         this.age = age;
 8         this.height = height;
 9         this.name = name;
10     }
11 }