package com.luhao.serializable;

import java.io.Externalizable;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectInputStream;
import java.io.ObjectOutput;
import java.io.ObjectOutputStream;
import java.io.Serializable;

import org.junit.Test;

public class Test06_Serializable {
	//Java中如何实现对象的序列化
	//1.实现Serializable接口
	//2.实现Externaliable接口,并实现读取写入方法,写入指定的属性
	//区别:Externalizabel反序列化创建对象的时候会调用构造器,而Serializable不需要
	//Serializable中transient修饰的方法不会被序列话(例子略),除非包含两个方法writeObj和ReadObj,因为序列化的时候java会寻找这两个方法的
	@Test
	public void testReadAndWrite() throws Exception {
		TestSerializable t1 = new TestSerializable();
		t1.setUserName("luhao");
		t1.setAge(26);
		ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream("e:\\test"));
		out.writeObject(t1);
		System.out.println("写入成功");
		ObjectInputStream ins = new ObjectInputStream(new FileInputStream("e:\\test"));
		System.out.println("正在读取");
		System.out.println(ins.readObject());
		ins.close();
		out.close();
	}
	@Test
	public void testReadAndWrite2() throws Exception {
		TestExternaliable t1 = new TestExternaliable();
		t1.setUserName("luhao");
		t1.setAge(26);
		ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream("e:\\test"));
		out.writeObject(t1);
		System.out.println("写入成功");
		ObjectInputStream ins = new ObjectInputStream(new FileInputStream("e:\\test"));
		System.out.println("正在读取");
		System.out.println(ins.readObject());
		ins.close();
		out.close();
	}
}
class TestSerializable implements Serializable{
	private static final long serialVersionUID = 2817558343900452926L;
	private String userName;
	private int age;
	public TestSerializable() {
		System.out.println("构造器没有被调用?");
	}
	public String getUserName() {
		return userName;
	}
	public void setUserName(String userName) {
		this.userName = userName;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	@Override
	public String toString() {
		return "TestSerializable [userName=" + userName + ", age=" + age + "]";
	}	
    private void writeObject(ObjectOutputStream out) throws IOException {  
        out.defaultWriteObject();  
        out.writeInt(age);  
    }  
 
    private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {  
        in.defaultReadObject();  
        age = in.readInt();  
        age = 666;
    }  
}
class TestExternaliable implements Externalizable{
	private String userName;
	private int age;
	public TestExternaliable() {
		System.out.println("构造器被调用了?");
	}
	@Override
	public void writeExternal(ObjectOutput out) throws IOException {
		out.writeObject(userName);
		out.writeObject(age);
	}

	@Override
	public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
		userName = (String) in.readObject();
		age = (int)in.readObject();
	}
	public String getUserName() {
		return userName;
	}
	public void setUserName(String userName) {
		this.userName = userName;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	@Override
	public String toString() {
		return "TestExternaliable [userName=" + userName + ", age=" + age + "]";
	}
	
}