직렬화

package com.serial;

import java.io.Serializable;

//Serializable 인터페이스를 구현하는 것은 해당클래스가 직렬화 대상임을 명시하는 역할
public class Customer implements Serializable{
	//멤버 변수
	private String name;
	//생성자
	public Customer(String name){
		this.name=name;
	}
	public void setName(String name){
		this.name=name;
	}
	public String getName(){
		return name;
	}
	//Object to String()재정의
	public String toString(){
		return "당신의 이름: "+name;
	}
	
	public static void main(String[] args) {
		
	}
}

package com.serial;

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

public class ObjectInOutputStreamEx {
	public static void main(String[] args) {
		ObjectOutputStream oos=null;
		FileOutputStream fos=null;
		ObjectInputStream ois=null;
		FileInputStream fis=null;

		try{
			fos=new FileOutputStream("Object.ser");
			//객체 직렬화
			oos=new ObjectOutputStream(fos);
			oos.writeObject(new Customer("홍길동"));

			fis=new FileInputStream("object.ser");
			ois=new ObjectInputStream(fis);

			Customer m=(Customer)ois.readObject();
			System.out.println(m);
		}catch(IOException ioe){
			ioe.printStackTrace();
		}catch (ClassNotFoundException cnfe){
			cnfe.printStackTrace();
		}finally{
			try{
				if(oos!=null)oos.close();
				if(fos!=null)fos.close();
				if(ois!=null)ois.close();
				if(fis!=null)fis.close();
			}catch(IOException ioe){
				ioe.printStackTrace();
			}
		}
	}

}

package com.serial;

import java.io.Serializable;

public class UserInfo implements Serializable{
	String id;
	String password;
	int num;

	public UserInfo(String id, String password,int num){
		this.id= id;
		this.password= password;
		this.num= num;
	}
	@Override
	public String toString(){
		return "UserInfo {id="+id+", password ="+ password+", num="+num+"}";
	}

}

package com.serial;

import java.util.ArrayList;
import java.io.FileOutputStream;
import java.io.ObjectOutputStream;
import java.io.IOException;

public class SerialEx1 {
	public static void main(String[] args) {
		try{
			String fileName = "UserInfo.ser";
			FileOutputStream fos = new FileOutputStream(fileName);

			ObjectOutputStream out = new ObjectOutputStream(fos);

			UserInfo u1 =new UserInfo("JavaMan","1234",30);
			UserInfo u2 =new UserInfo("JavaWoMan","4321",26);

			ArrayList list = new ArrayList();

			list.add(u1);
			list.add(u2);

			//객체를 직렬화 한다.
			out.writeObject(u1);
			out.writeObject(u2);
			out.writeObject(list);
			out.close();
			fos.close();
			System.out.println("직렬화가 잘 끝났습니다.");
		}catch(IOException e){
			e.printStackTrace();
		}
	}//main
}//class

package com.serial;

import java.util.ArrayList;
import java.io.ObjectInputStream;
import java.io.FileInputStream;
import java.io.IOException;

public class SerialEx2 {
	public static void main(String[] args) {
		try{
			String fileName = "UserInfo.ser";
			FileInputStream fis = new FileInputStream(fileName);

			ObjectInputStream in = new ObjectInputStream(fis);

			//객체를 읽을때는 출력한 순서와 일치해야 한다.
			UserInfo u1 = (UserInfo)in.readObject();
			UserInfo u2 = (UserInfo)in.readObject();

			ArrayList list = (ArrayList)in.readObject();

			System.out.println(u1);
			System.out.println(u2);
			System.out.println(list);
			in.close();
			fis.close();
		}catch(Exception e){
			e.printStackTrace();
		}
	}//main
}//class