Spring

SpringMVC

noddu 2021. 3. 21. 13:48
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@ -  Annotation 

 

0.  POM.xml API 다운로드

1.  Tomcat start

2.  web.xml에 기술된 내용을 보고 일을한다.

 

 

 

@RequestMapping  -  요청 URL을 어떤 method가 처리할지 mapping해줌

 

@Controller -  controller ( method의 반환결과를 JSON형태로 반환)

 

@Repository -  DAO클래스, DB에 접근하는 method를 가지고있는 클래스에서 쓰임 (model)

 

 

★ DI -(의존성주입, Dependency Injection) - 의존성 약하게

   각 객체간 의존성을 스프링컨테이너가 연결해주는것 ( bean(클래스)설정파일에 의존관계 정보추가)

           setter주입방법, 생성자 주입방법

AOP??

 

@Autowired - 쓰고싶은 클래스 당겨쓰기 (목적 - setter방법, 생성자방법 쓰기위해) - inject로도 사용가능

 

 

 ●web.xml(환경설정파일)

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee https://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

	<!-- The definition of the Root Spring Container shared by all Servlets and Filters -->
	<context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>/WEB-INF/spring/root-context.xml</param-value>
	</context-param>
	
	<!-- Creates the Spring Container shared by all Servlets and Filters -->
	<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>

	<!-- Processes application requests -->
	<servlet>
		<servlet-name>appServlet</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<init-param>
			<param-name>contextConfigLocation</param-name>
			<param-value>/WEB-INF/spring/appServlet/servlet-context.xml</param-value>
		</init-param>
		<load-on-startup>1</load-on-startup>
	</servlet>
		
	<servlet-mapping>
		<servlet-name>appServlet</servlet-name>
		<url-pattern>/</url-pattern>
	</servlet-mapping>

</web-app>

                                                                 contextConfigLocation

 Spring환경설정파일            web.xml  -  >/WEB-INF/spring/root-context.xml<         DB connection기술하기

 

 

▲리딩           org.springframework.context.ContextLoaderListner   ( 첫번째로시작)

 

 

▼리딩          org.springframework,web.servlet.DispatcherServlet (스프링에서 front controller역할) pojo는 만들어야함

 

 

                                                                  contextConfigLocation

  Spring환경설정파일           /WEB-INF/spring/appServlet/servlet-context.xml     뷰리졸버 등록,  컴포넌트scan

 

 

 

 

 

 ●servlet-context.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans:beans xmlns="http://www.springframework.org/schema/mvc"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:beans="http://www.springframework.org/schema/beans"
	xmlns:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd
		http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">

	<!-- DispatcherServlet Context: defines this servlet's request-processing infrastructure -->
	
	<!-- Enables the Spring MVC @Controller programming model -->
	<annotation-driven />

	<!-- Handles HTTP GET requests for /resources/** by efficiently serving up static resources in the ${webappRoot}/resources directory -->
	<resources mapping="/resources/**" location="/resources/" />

	<!-- Resolves views selected for rendering by @Controllers to .jsp resources in the /WEB-INF/views directory -->
	<beans:bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<beans:property name="prefix" value="/WEB-INF/views/" />
		<beans:property name="suffix" value=".jsp" />
	</beans:bean>
	
	<context:component-scan base-package="kr.smhrd.myapp" />
	
	
	
</beans:beans>

annotation-driven  -  @기호가붙어있는것들만 SpringContainer가 관리해줌

  

<resources mapping="/resources   -   resources의 위치를 mapping 하는부분

 

<bean ~ /bean>   -     viewResolver 하는부분 ( 내부에서 setter메소드 동작 )

 

component-scan  -  base-pakage에 써놓은곳을 스캔해서

@기호가있는 클래스를 자동으로 SpringContainer에 객체생성(클래스이름으로 )

                              ( HomeController homecontroller = new HomeController 형식 )

                                                                         *파일에 S기호가 있으면 스프링컨테이너에서 관리한다는 뜻

 

                    ▼

◆당겨쓰기할때  예시

@Autowired

public HomeController homecontroller()

            (변수명상관x , 타입맞추는게 중요)

 

 

 

/**
 * Handles requests for the application home page.
 */
@Controller
public class HomeController {
	
	private static final Logger logger = LoggerFactory.getLogger(HomeController.class);
	
	/**
	 * Simply selects the home view to render by returning its name.
	 */
	@RequestMapping(value = "/", method = RequestMethod.GET)
	public String home(Locale locale, Model model) {
		logger.info("Welcome home! The client locale is {}.", locale);
		
		Date date = new Date();
		DateFormat dateFormat = DateFormat.getDateTimeInstance(DateFormat.LONG, DateFormat.LONG, locale);
		
		String formattedDate = dateFormat.format(date);
		
		model.addAttribute("serverTime", formattedDate );
		model.addAttribute("name", "김민관" );
		
		return "home";
	}
	
}

@RequestMapping되어있으면 RequestmappingHandlerMapping정보가 console창에뜸(내부적으로 자동)

 

 

root-context.xml에 DB연결

 

 

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