ObjectInputStram 和ObjectOutputStream对象的持久化操作

对象：
 import java.io.*;

public class Person implements Serializable{

String name;

int age;

String country;

public Person(String name, int age, String country) {

this.name = name;

this.age = age;

this.country = country;

}

@Override

public String toString() {

// TODO Auto-generated method stub

return name+":"+age+":"+country;

}

}

//功能的实现

import java.io.*;

public class ObjectStream {

/**

*  1.ObjectInputStram 和ObjectOutputStream 是可以直接操作对象的字节流

*  2.被其操作的对象必须实现序列化（Serializable——标记接口），将堆内存中的对象存到硬盘上，即把对象持久化，

*  3.static final long serialVersionUID = 42L 类的ID号静态化，始终保持不变，

* 类的ID号是根据类的成员变量算出来的，如果成员变量发生改变 ，那么类的Id号也会改变

*  4.静态成员不能别序列化

*  5.transient int age；transient 能使非静态成员变量不被序列化，

* 

* @throws IOException

* @throws ClassNotFoundException 

*/

public static void main(String[] args) throws IOException, ClassNotFoundException {

//writeObj();

readObj();

}

//对象写入文件

public static void writeObj() throws IOException {

ObjectOutputStream oo = new ObjectOutputStream(new FileOutputStream(

"D:\\obj.object"));

oo.writeObject(new Person("lisi", 99, "cn"));

oo.close();

}

//读取文件封装好的对象

public static void readObj() throws IOException, ClassNotFoundException {

ObjectInputStream os = new ObjectInputStream(new FileInputStream(

"D:\\obj.object"));

Person person = (Person) os.readObject();

System.out.println(person);

os.close();

}

}