序列化流

序列化流:把对象按照流一样的方式存入文本文件          对象→流

ObjectOutputStream

方法：writeObject()

反序列化流：把文本文件的流对象还原成对象    流→对象

ObjectInputStream

！！！  要想对象实例化，必须先定义一个类  而且这个类必须加上接口：Serializable    这个接口交做标记接口

标记接口：不用添加方法

可能产生 ID不匹配的问题

解决方法：点击黄色警告线第二个即可，  表示变动的ID值

可以使用tainsient关键字使成员变量不被序列化

代码：

package cn.idcast3;

import java.io.Serializable;

public class Person implements Serializable {

	private static final long serialVersionUID = -1623514706657398082L;
	private String name;
	private int age;           如果不想被序列化 private tainsient int age;

	public Person() {
		super();
		// TODO Auto-generated constructor stub

	}

	public Person(String name, int age) {
		super();
		this.name = name;
		this.age = age;

	}

	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;
	}

	@Override
	public String toString() {
		return "Person [name=" + name + ", age=" + age + "]";
	}

}

package cn.idcast3;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

public class ObjectStream {
	public static void main(String[] args) throws IOException,
			ClassNotFoundException {
		write();
		read();
	}

	private static void read() throws IOException, ClassNotFoundException {
		// TODO Auto-generated method stub
		ObjectInputStream ois = new ObjectInputStream(new FileInputStream(
				"oos.txt"));
		Object obj = ois.readObject();
		ois.close();
		System.out.println(obj);

	}

	private static void write() throws IOException, IOException {
		// TODO Auto-generated method stub
		ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(
				"oos.txt"));
		Person p = new Person("曾饺", 18);
		oos.writeObject(p);
		oos.close();
	}

}