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[study]이론정리/Spring Boot

Spring MVC - Model Scope

by yoon9i 2024. 7. 2.

8> Model Scope

(1) session scope
- @SessionAttribute(names={"key값", "key값"})

  Model 을 저장할 때 위에서 설정한 key 값을 사용하면
  session scope 에 Model 이 저장된다.

- 세션을 사용하고자하는 Controller 마다 매번 @SessionAttribute 을
  설정해야 된다. 

package com.exam;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Application {

	public static void main(String[] args) {
		SpringApplication.run(Application.class, args);
	}
	
	
}
package com.exam.controller;

import javax.servlet.ServletContext;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.SessionAttributes;

@Controller
@SessionAttributes(names = {"session", "xxx"}) // 만들때도 사용
public class MainController {
	
	Logger logger = LoggerFactory.getLogger(getClass());
	
	@Autowired
	ServletContext application;
	
	// Model 저장
	@GetMapping("/set-model")
	public String set_model(ModelMap m) {
		
		// request scope 에 저장
		m.addAttribute("request", "홍길동");
		
		// session scope 에 저장
		m.addAttribute("session", "홍길동2");
		m.addAttribute("xxx", "홍길동3");
		
		// application scope 에 저장
		application.setAttribute("application", "홍길동4");
		
		return "hello";
	}
}
<%@ page contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    request: ${request}<br>
    session: ${sessionScope.session}<br>
    xxx: ${sessionScope.xxx}<br>
    application: ${applicationScope.application}<br>
</body>

</html>
# application.properties
logging.level.org.springframework=info

# tomcat port 번호 변경
server.port=8090

# context 명 변경
server.servlet.context-path=/app

# jsp 의 경로와 확장자 지정
spring.mvc.view.prefix=/WEB-INF/views/
spring.mvc.view.suffix=.jsp
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
	http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.7.18</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.exam</groupId>
	<artifactId>demo</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>demo</name>
	<description>Demo project for Spring Boot</description>
	<properties>
		<java.version>11</java.version>
	</properties>
	<dependencies>
		
<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-devtools -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-devtools</artifactId>
</dependency>
<dependency>
	<groupId>org.apache.tomcat.embed</groupId>
	<artifactId>tomcat-embed-jasper</artifactId>
	<scope>provided</scope>
</dependency>
<dependency>
	<groupId>javax.servlet</groupId>
	<artifactId>jstl</artifactId>
</dependency>


		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>

</project>


(2) application scope
- @Autowired
  ServletContext ctx;

  ctx.setAttribute(key, value);

# JSP
${requestScope.key}
${sessiontScope.key}
${applicationScope.key}

${key} <== request 에서 먼저찾고 없으면 session 찾고 또 없으면 application 에서 찾음.

package com.exam.controller;

import javax.servlet.ServletContext;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.SessionAttributes;

@Controller
@SessionAttributes(names = {"session", "xxx"}) // 사용할때도 사용
public class MainController2 {
	
	Logger logger = LoggerFactory.getLogger(getClass());
	
	@Autowired
	ServletContext application;
	
	// MainController 에서 저장된 Model 사용
	@GetMapping("/get-model")
	public String get_model(ModelMap m) {
		
		// request scope 에서 가져옴
		String request = (String)m.getAttribute("request");
		logger.info("logger: request:{}", request);
		
		// session scope 조회
		String session = (String)m.getAttribute("session");
		String xxx = (String)m.getAttribute("xxx");
		logger.info("logger: session:{}", session);
		logger.info("logger: xxx:{}", xxx);
		
		// application scope 조회
		String application2 = (String)application.getAttribute("application");
		logger.info("logger: application:{}", application2);
		
		return "hello";
	}
}

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