> For the complete documentation index, see [llms.txt](https://dodeon.gitbook.io/study/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://dodeon.gitbook.io/study/kimyounghan-spring-mvc/05-spring-mvc-architecture/practice.md).

# 스프링 MVC 실용적인 방식

{% tabs %}
{% tab title="SpringMemberControllerV3.java" %}

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

    private final MemberRepository memberRepository = MemberRepository.getInstance();

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

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

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

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

    @GetMapping
    public String members(Model model) {
        List<Member> members = memberRepository.findAll();

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

{% endtab %}

{% tab title="SpringMemberControllerV2.java" %}

```java
@Controller
@RequestMapping("/springmvc/v2/members")
public class SpringMemberControllerV2 {

    private final MemberRepository memberRepository = MemberRepository.getInstance();

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

    @RequestMapping("/save")
    public ModelAndView save(HttpServletRequest request, HttpServletResponse response) {
        String username = request.getParameter("username");
        int age = Integer.parseInt(request.getParameter("age"));

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

        ModelAndView modelView = new ModelAndView("save-result");
        modelView.addObject("member", member);

        return modelView;
    }

    @RequestMapping
    public ModelAndView members() {
        List<Member> members = memberRepository.findAll();
        ModelAndView modelView = new ModelAndView("members");

        modelView.addObject("members", members);

        return modelView;
    }
}
```

{% endtab %}
{% endtabs %}

V2는 ModelAndView를 계속 중복으로 만들어줘야 해서 붎편했다. V3는 Model을 받아 처리하고 String을 반환한다. 또한, post든 get이든 http 메서드 상관없이 요청을 받는 방식에서 @GetMapping 등의 애너테이션을 사용하도록 개선했다.

### Model 파라미터

* Model을 파라미터로 받아서 사용할 수 있다.

### ViewName

* 뷰의 논리 이름을 직접 반환할 수 있다.

### @RequestParam

* 요청 파라미터를 받을 때 사용한다.
  * request.getParameter("username")과 유사하다.
* GET 쿼리 파라미터, POST Form 방식 모두 지원한다.

### @RequestMapping

* @GetMapping 등 Http 메서드로 구분할 수 있다.


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://dodeon.gitbook.io/study/kimyounghan-spring-mvc/05-spring-mvc-architecture/practice.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.