Java 序列化

序列化(对象写入文件)   反序列化(从文件读取对象)

 

public class Demo01 {

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

//序列化 对象写入文件

FileOutputStream fos=new FileOutputStream("D:\\person.txt");

ObjectOutputStream oos=new ObjectOutputStream(fos);//序列化

Person p=new Person("zhangsan",18); //对象  需要实现接口

oos.writeObject(p);   //写入对象  对象可为 存储Person的集合

oos.close();

 

//反序列化 从文件中读出对象

FileInputStream fis=new FileInputStream("D:\\person.txt");

ObjectInputStream ois=new ObjectInputStream(fis);

try {

while(true) { //Person.class丢失ClassNotFoundException

Object obj = ois.readObject(); //读取对象

Person p2=(Person)obj; //Person类型

System.out.println(p2); //输出 调用p2.toString()

}

} catch(EOFException e) {

System.out.println("读到了文件的末尾");

}

ois.close();

}

}

 

public class Person implements Serializable{//实现(标记类)接口  无抽象方法    

private String name; //对象才可以序列化

//private int age;

//private static int age;//静态修饰  是类的数据 也不会被序列化

private transient int age;//瞬态关键字transient修饰的属性不会序列化

private static final long serialVersionUID=4321L;//序列化号写死

//修改Person类后也能反序列化

 

public String getName(){return name;}

public void setName(String name){this.name = name;}

public int getAge(){return age;}

public void setAge(int age){this.age = age;}

 

public Person(){super();}

public Person(String name, int age) {

super();

this.name = name;

this.age = age;

}

@Override

public String toString() {

return "Person [name=" + name + ", age=" + age + "]";

}

}

 

posted @ 2019-01-10 11:00  博客张C  阅读(118)  评论(0编辑  收藏  举报