10> redirect 와 forward
(1) 문법:
return "redirect:요청맵핑값"; // 이전 서블릿의 response.sendRedirect("") 동일
return "forward:요청맵핑값"; // 이전 서블릿의 request.getRequestDispatcher("").forward(request, response) 동일
11> redirect-flashScope-forward
==> redirect 했음에도 불구하고 request scope 에 저장된 Model 을 사용할 수 있음.
단, 한번만 가능.
==> RedirectAttributes 모델 + ra.addFlashAttribute("model", "홍길동"); 사용해야한다
// flash
@GetMapping("/redirect-flash")
public String flash(RedirectAttributes ra) {
ra.addFlashAttribute("model", "홍길동");
return "redirect:hello";
}
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 java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;
import com.exam.dto.LoginDTO;
@Controller
public class MainController {
Logger logger = LoggerFactory.getLogger(getClass());
// redirect 와 forward 타켓
@GetMapping("/hello")
public String hello() {
return "hello";
}
// // redirect
// @GetMapping("/redirect")
// public String redirect() {
// // http://localhost:8090/app/redirect 로 검색을해도
// // http://localhost:8090/app/hello 로 변경됨
// return "redirect:hello";
// }
// redirect
@GetMapping("/redirect")
public String redirect(ModelMap m) {
m.addAttribute("model", "홍길동");
return "redirect:hello";
}
// url 이 변경되기때문에 model 값을 가져올수없다.
// forward
@GetMapping("/forward")
public String forward(ModelMap m) {
m.addAttribute("model", "이순신");
return "forward:hello";
}
// url 이 변경이 안되기때문에 model 값을 가져올수있다.
// flash
@GetMapping("/redirect-flash")
public String flash(RedirectAttributes ra) {
ra.addFlashAttribute("model", "홍길동");
return "redirect:hello";
}
}package com.exam.dto;
public class LoginDTO {
String userid;
String passwd;
public LoginDTO() {}
public LoginDTO(String userid, String passwd) {
this.userid = userid;
this.passwd = passwd;
}
public String getUserid() {
return userid;
}
public void setUserid(String userid) {
this.userid = userid;
}
public String getPasswd() {
return passwd;
}
public void setPasswd(String passwd) {
this.passwd = passwd;
}
@Override
public String toString() {
return "LoginDTO [userid=" + userid + ", passwd=" + passwd + "]";
}
}<%@ page
contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"
%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>
</head>
<body>
<h2>hello.jsp</h2>
모델값: ${model}<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
# jsp의 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>
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