session scope

풀스택 개발자 2020. 5. 8. 13:50

java방식과 xml방식 공통된 DataBean1,2 beans

package kr.co.softcampus.beans;

public class DataBean1 {
	private String data1;
	private String data2;
	public String getData1() {
		return data1;
	}
	public void setData1(String data1) {
		this.data1 = data1;
	}
	public String getData2() {
		return data2;
	}
	public void setData2(String data2) {
		this.data2 = data2;
	}
}

package kr.co.softcampus.beans;

public class DataBean2 {
	private String data3;
	public String getData3() {
		return data3;
	}
	public void setData3(String data3) {
		this.data3 = data3;
	}
	public String getData4() {
		return data4;
	}
	public void setData4(String data4) {
		this.data4 = data4;
	}
	private String data4;
}

java방식

controller

package kr.co.softcampus.controller;

import javax.annotation.Resource;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;

import kr.co.softcampus.beans.DataBean1;
import kr.co.softcampus.beans.DataBean2;

@Controller
public class TestController {
	//브라우저가 최초의 요청이 발생하게되면 bean객체가 각각 주입됨 -> 한번 주입된 객체를 계속사용함
	@Autowired//type을 통한 주입을 받게됨
	DataBean1 sessionBean1;//정의된 bean중에서 DataBean1 타입으로 정의된 bean이 있는지 확인해봄 (bean이 있는곳에서)
	
	@Resource(name = "sessionBean2")//이름을 통한 주입에는 Resource
	DataBean2 sessionBean2;//정의된 bean중에서 DataBean2 타입으로 정의된 bean이 있는지 확인해봄 (bean이 있는곳에서)
	
	
	
	@GetMapping("/test1")
	public String test1(){
		
		sessionBean1.setData1("data1");
		sessionBean1.setData2("data2");
		
		sessionBean2.setData3("data3");
		sessionBean2.setData4("data4");
		return "test1";
	}
	
	@GetMapping("/result1")
	public String result1(){
		System.out.println("sessionBean1.data1:"+sessionBean1.getData1());
		System.out.println("sessionBean1.data2:"+sessionBean1.getData2());
		
		System.out.println("sessionBean2.data3:"+sessionBean2.getData3());
		System.out.println("sessionBean2.data4:"+sessionBean2.getData4());
		return "result1";
	}
}

bean정의

package kr.co.softcampus.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.context.annotation.SessionScope;

import kr.co.softcampus.beans.DataBean1;
import kr.co.softcampus.beans.DataBean2;

// 프로젝트 작업시 사용할 bean을 정의하는 클래스
@Configuration
public class RootAppContext {
	@Bean
	@SessionScope//bean이 주입되는시점: 브로우저의 최초의 요청이 있을때
	public DataBean1 databean1() {
		return new DataBean1();
	}
	
	@Bean("sessionBean2")
	@SessionScope//bean이 주입되는시점: 브로우저의 최초의 요청이 있을때
	public DataBean2 databean2() {
		return new DataBean2();
	}
}

session영역에 저장되있는지 확인

<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	<h1>result1</h1>
	<h3>sessionBean1.data1:${sessionScope.sessionBean1.data1 }</h3>
	<h3>sessionBean1.data2:${sessionScope.sessionBean1.data2 }</h3>

	<h3>sessionBean2.data3:${sessionScope.sessionBean2.data3 }</h3>
	<h3>sessionBean2.data4:${sessionScope.sessionBean2.data4 }</h3>
</body>
</html>

결과창

값이 출력되지않는다 즉 session에 데이터가 저장되지않는다

브라우저가 최초의 요청이 발생했을때 객체가 주입되는걸로 끝난다!

값을 넘기고싶을땐 model 객체 주입후 사용

@GetMapping("/result1")
	public String result1(Model model){
		System.out.println("sessionBean1.data1:"+sessionBean1.getData1());
		System.out.println("sessionBean1.data2:"+sessionBean1.getData2());
		
		System.out.println("sessionBean2.data3:"+sessionBean2.getData3());
		System.out.println("sessionBean2.data4:"+sessionBean2.getData4());
		
		model.addAttribute("sessionBean1", sessionBean1);
		model.addAttribute("sessionBean2", sessionBean2);
		return "result1";
	}

그후 model은 request영역에 담기기때문 requestScope를 사용

<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	<h1>result1</h1>
	<h3>sessionBean1.data1:${requestScope.sessionBean1.data1 }</h3>
	<h3>sessionBean1.data2:${requestScope.sessionBean1.data2 }</h3>

	<h3>sessionBean2.data3:${requestScope.sessionBean2.data3 }</h3>
	<h3>sessionBean2.data4:${requestScope.sessionBean2.data4 }</h3>
</body>
</html>

XML방식

controller

package kr.co.softcampus.controller;

import javax.annotation.Resource;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Lazy;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;

import kr.co.softcampus.beans.DataBean1;
import kr.co.softcampus.beans.DataBean2;

@Controller
public class TestController {
	//브라우저가 최초의 요청이 발생하게되면 bean객체가 각각 주입됨 -> 한번 주입된 객체를 계속사용함
	@Autowired//xml의경우 서버가 동작시 무조건 주입하려고 하기때문에 lazy어노테이션 기입
	@Lazy
	DataBean1 sessionBean1;
	
	@Resource(name = "sessionBean2")
	@Lazy
	DataBean2 sessionBean2;
	
	
	
	@GetMapping("/test1")
	public String test1(){
		
		sessionBean1.setData1("data1");
		sessionBean1.setData2("data2");
		
		sessionBean2.setData3("data3");
		sessionBean2.setData4("data4");
		return "test1";
	}
	
	@GetMapping("/result1")
	public String result1(Model model){
		System.out.println("sessionBean1.data1:"+sessionBean1.getData1());
		System.out.println("sessionBean1.data2:"+sessionBean1.getData2());
		
		System.out.println("sessionBean2.data3:"+sessionBean2.getData3());
		System.out.println("sessionBean2.data4:"+sessionBean2.getData4());
		
		model.addAttribute("sessionBean1", sessionBean1);
		model.addAttribute("sessionBean2", sessionBean2);
		return "result1";
	}
}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	   xsi:schemaLocation="http://www.springframework.org/schema/beans
	   					   http://www.springframework.org/schema/beans/spring-beans.xsd">
	   	<bean class='kr.co.softcampus.beans.DataBean1' scope='session'/>
	   	<bean id='sessionBean2' class='kr.co.softcampus.beans.DataBean2' scope='session'/>
	   				   
</beans>

<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	<h1>result1</h1>
	<h3>sessionBean1.data1:${sessionScope.sessionBean1.data1 }</h3>
	<h3>sessionBean1.data2:${sessionScope.sessionBean1.data2 }</h3>

	<h3>sessionBean2.data3:${sessionScope.sessionBean2.data3 }</h3>
	<h3>sessionBean2.data4:${sessionScope.sessionBean2.data4 }</h3>
</body>
</html>

xml에서도 먼저 session영역에 저장되있는지 확인

결과를 보니 이름을 가지고 주입을 받았던 (xml에서 bean을 셋팅하고 이름을 통해 주입받은)경우 session영역에 자동으로 저장됨

주입되지않은 sessionBean1은 model객체를 주입시킨다

	@GetMapping("/result1")
	public String result1(Model model){
		System.out.println("sessionBean1.data1:"+sessionBean1.getData1());
		System.out.println("sessionBean1.data2:"+sessionBean1.getData2());
		
		System.out.println("sessionBean2.data3:"+sessionBean2.getData3());
		System.out.println("sessionBean2.data4:"+sessionBean2.getData4());
		
		model.addAttribute("sessionBean1", sessionBean1);
		return "result1";
	}

<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	<h1>result1</h1>
	<h3>sessionBean1.data1:${requestScope.sessionBean1.data1 }</h3>
	<h3>sessionBean1.data2:${requestScope.sessionBean1.data2 }</h3>

	<h3>sessionBean2.data3:${sessionScope.sessionBean2.data3 }</h3>
	<h3>sessionBean2.data4:${sessionScope.sessionBean2.data4 }</h3>
</body>
</html>

출력창