[Spring] 스프링 MVC 실용적인 방식

MVC 프레임워크 만들기에서 v3은 ModelView를 개발자가 직접 생성해서 반환했기 때문에,

불편했던 기억이 날 것이다.

 

물론 v4를 만들면서 실용적으로 개선한 기억도 날 것이다.

 

스프링 MVC는 개발자가 편리하게 개발할 수 있도록 수 많은 편의 기능을 제공한다.

실무에서는 지금부터 설명하는 방식을 주로 사용한다.

 

SpringMemberControllerV3

package helloMVC.servlet.web.springmvc.v3;

import helloMVC.servlet.domain.member.Member;
import helloMVC.servlet.domain.member.MemberRepository;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.*;

import java.util.List;

/**
 * v3
 * Model 도입
 * ViewName 직접 반환
 * @RequestParam 사용
 * @RequestMapping -> @GetMapping, @PostMapping
 */

@Controller
@RequestMapping("/springmvc/v3/members")
public class SpringMemberControllerV3 {

    private MemberRepository memberRepository = MemberRepository.getInstance();

    @RequestMapping("/new-form")
    public String newForm() {
        return "new-form";
    }

    @RequestMapping("/save")
    public String save(
            @RequestParam("uesrname") String username,
            @RequestParam("age") int age,
            Model model) {

        Member member = new Member(username, age);
        memberRepository.save(member);

        model.addAttribute("member", member);
        return "save-result";
    }

    @RequestMapping
    public String members(Model model) {

        List<Member> members = memberRepository.findAll();

        model.addAttribute("members", members);
        return "members";
    }
}

 

그런데 여기서 통신 방식을 지정할 수 있다.(GET/POST)

 

package helloMVC.servlet.web.springmvc.v3;

import helloMVC.servlet.domain.member.Member;
import helloMVC.servlet.domain.member.MemberRepository;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.*;

import java.util.List;

/**
 * v3
 * Model 도입
 * ViewName 직접 반환
 * @RequestParam 사용
 * @RequestMapping -> @GetMapping, @PostMapping
 */

@Controller
@RequestMapping("/springmvc/v3/members")
public class SpringMemberControllerV3 {

    private MemberRepository memberRepository = MemberRepository.getInstance();

    @RequestMapping(value = "/new-form", method = RequestMethod.GET)
    public String newForm() {
        return "new-form";
    }

    @RequestMapping(value = "/save", method = RequestMethod.POST)
    public String save(
            @RequestParam("uesrname") String username,
            @RequestParam("age") int age,
            Model model) {

        Member member = new Member(username, age);
        memberRepository.save(member);

        model.addAttribute("member", member);
        return "save-result";
    }

    @RequestMapping(method = RequestMethod.GET)
    public String members(Model model) {

        List<Member> members = memberRepository.findAll();

        model.addAttribute("members", members);
        return "members";
    }
}

 

어노테이션을 사용하면 더 편리하다

package helloMVC.servlet.web.springmvc.v3;

import helloMVC.servlet.domain.member.Member;
import helloMVC.servlet.domain.member.MemberRepository;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.*;

import java.util.List;

/**
 * v3
 * Model 도입
 * ViewName 직접 반환
 * @RequestParam 사용
 * @RequestMapping -> @GetMapping, @PostMapping
 */

@Controller
@RequestMapping("/springmvc/v3/members")
public class SpringMemberControllerV3 {

    private MemberRepository memberRepository = MemberRepository.getInstance();

    @GetMapping("new-form")
//    @RequestMapping(value = "/new-form", method = RequestMethod.GET)
    public String newForm() {
        return "new-form";
    }

    @PostMapping("/save")
//    @RequestMapping(value = "/save", method = RequestMethod.POST)
    public String save(
            @RequestParam("uesrname") String username,
            @RequestParam("age") int age,
            Model model) {

        Member member = new Member(username, age);
        memberRepository.save(member);

        model.addAttribute("member", member);
        return "save-result";
    }

    // /springmvc/v2/members
    @GetMapping
//    @RequestMapping(method = RequestMethod.GET)
    public String members(Model model) {

        List<Member> members = memberRepository.findAll();

        model.addAttribute("members", members);
        return "members";
    }
}

405 Not Allowed

 

정상 응답

 

new-form은 GetMapping 이어서 GET방식은 정상으로 응답하고

 

Post방식은 상태코드를 405로 반환하여 허용하지 않는다.