Spring MVC 실행 과정 및 Controller 작성

실행 과정

1. 주소창에 http://~/xxxx 입력

2. DispatcherServlet → Controller : Controller에서 path가 /xxxx인 메소드 실행

3. Controller → DispatcherServlet : InternalResourceViewResolver가 가져온 return 값에 "/WEB-INF/views/"와 ".jsp"를 붙임

4. DispatcherServlet → View template : return 받은 "/WEB-INF/views/xxxx.jsp" 경로 파일 실행

(아래 DispatcherServlet 설정 참고)

 

 

DispatcherServlet(=WebMvcContextConfiguration.java) 설정

@Configuration
@EnableWebMvc
@ComponentScan(basePackages = { "kr.or.connect.mvcexam.controller" })
public class WebMvcContextConfiguration extends WebMvcConfigurerAdapter {
	@Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/assets/**").addResourceLocations("classpath:/META-INF/resources/webjars/").setCachePeriod(31556926);
        registry.addResourceHandler("/css/**").addResourceLocations("/css/").setCachePeriod(31556926);
        registry.addResourceHandler("/img/**").addResourceLocations("/img/").setCachePeriod(31556926);
        registry.addResourceHandler("/js/**").addResourceLocations("/js/").setCachePeriod(31556926);
    }
 
    // default servlet handler를 사용하게 합니다.
    @Override
    public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
        configurer.enable();
    }
   
    @Override
    public void addViewControllers(final ViewControllerRegistry registry) {
    	System.out.println("addViewControllers가 호출됩니다. ");
        registry.addViewController("/").setViewName("main");
    }
    
    @Bean
    public InternalResourceViewResolver getInternalResourceViewResolver() {
        InternalResourceViewResolver resolver = new InternalResourceViewResolver();
        resolver.setPrefix("/WEB-INF/views/");
        resolver.setSuffix(".jsp");
        return resolver;
    }
}

 

 

Controller 작성 방법1 - @GetMapping, @PostMapping을 이용한 Controller 작성

@Controller
public class PlusController {
	@GetMapping(path="/plusform")
	public String plusform() {
		return "plusForm";	//파일명과 일치
	}
	
	@PostMapping(path="/plus")
	public String plus(
		@RequestParam(name = "value1", required = true) int value1,
		@RequestParam(name = "value2", required = true) int value2, 
		ModelMap modelMap) 
	{
		int result = value1 + value2;

		modelMap.addAttribute("value1", value1);
		modelMap.addAttribute("value2", value2);
		modelMap.addAttribute("result", result);
		return "plusResult";	//파일명과 일치
	}
}

 

plusForm.jsp

<form method="post" action="plus"> 
value1 : <input type="text" name="value1"><br>
value2 : <input type="text" name="value2"><br>
<input type="submit" value="확인">
</form>

 

plusResult.jsp

${value1} 더하기 ${value2} (은/는) ${result} 입니다.

 

 

Controller 작성 방법2 - @RequestMapping을 이용한 Controller 작성

@Controller
public class UserController {
	@RequestMapping(path="/userform", method=RequestMethod.GET)
	public String userform() {
		return "userform";
	}
	
	@RequestMapping(path="/regist", method=RequestMethod.POST)
	public String regist(@ModelAttribute User user) {
		System.out.println("사용자가 입력한 user 정보입니다. 해당 정보를 이용하는 코드가 와야합니다.");
		System.out.println(user);
		return "regist";
	}
}

 

User.java

public class User {
	private String name;
	private String email;
	private int age;
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getEmail() {
		return email;
	}
	public void setEmail(String email) {
		this.email = email;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	@Override
	public String toString() {
		return "User [name=" + name + ", email=" + email + ", age=" + age + "]";
	}
}

 

userform.jsp

<form method="post" action="regist">  
name : <input type="text" name="name"><br>
email : <input type="text" name="email"><br>
age : <input type="text" name="age"><br>
<input type="submit" value="확인"> 

 

regist.jsp

<h2>등록되었습니다.</h2>

 

 

Controller 작성 방법3 - @PathVariable을 이용한 Controller 작성

@Controller
public class GoodsController {
	@GetMapping("/goods/{id}")
	public String getGoodsById(
			@PathVariable(name="id") int id,
			@RequestHeader(value="User-Agent", defaultValue="myBrowser") String userAgent,
			HttpServletRequest request,
			ModelMap model
	) {
		
		String path = request.getServletPath();
		
		System.out.println("id : " + id);
		System.out.println("user_agent : " + userAgent);
		System.out.println("path : " + path);
		
		model.addAttribute("id", id);
		model.addAttribute("userAgent", userAgent);
		model.addAttribute("path", path);
		return "goodsById";
	}
}

 

goodsById.jsp

id : ${id} <br>
user_agent : ${userAgent} <br>
path : ${path} <br>

 

참조

www.boostcourse.org/web316/lecture/254350/

www.boostcourse.org/web316/lecture/254351/