spring MVC 이해하는 예제1

web.xml

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">

  <display-name>spring3</display-name>

  <welcome-file-list>

    <welcome-file>index.html</welcome-file>

    <welcome-file>index.htm</welcome-file>

    <welcome-file>index.jsp</welcome-file>

    <welcome-file>default.html</welcome-file>

    <welcome-file>default.htm</welcome-file>

    <welcome-file>default.jsp</welcome-file>

  </welcome-file-list>

  

    <!-- 스프링 환경 설정 시작 -->

    

    <!-- ContextLoaderListener : 서로 다른 DispatcherServlet이 공통으로 사용될 빈 설정  -->

    <!-- context-param 태그로 설정파일을 지정하지 않으면 applicationContext.xml이 설정 파일이 된다.  -->

    <!--

    <context-param>

   <param-name>contextConfigLocation</param-name>

        <param-value>

       /WEB-INF/service.xml,

/WEB-INF/common.xml

</param-value>

</context-param>

    -->

<listener>

<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>

</listener>

    <!-- 스프링 컨트롤러 -->

<servlet>

<servlet-name>dispatcher</servlet-name><!-- 환경설정 xml 이름, aa이면 aa-servlet.xml -->

<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

        <!--  환경설정 파일 명시하는 다른방법

        <init-param>

<param-name>contextConfigLocation</param-name>  여기 이름 꼭 이렇게 해야한다.

<param-value>

/WEB-INF/dispatcher-servlet.xml, 여기 이름은 자기 맘대로

/WEB-INF/front.xml

</param-value>

        </init-param>

        --> 

<load-on-startup>1</load-on-startup>

</servlet>

<servlet-mapping>

<servlet-name>dispatcher</servlet-name>

<url-pattern>*.action</url-pattern>

</servlet-mapping>

  

    <!-- 인코딩 필터 -->

<filter>

<filter-name>encodingFilter</filter-name>

<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>

<init-param>

<param-name>encoding</param-name>

<param-value>UTF-8</param-value>

</init-param>

</filter>

<filter-mapping>

<filter-name>encodingFilter</filter-name>

<url-pattern>/*</url-pattern>

</filter-mapping>

  

</web-app>

=============================================================================================================================================

dispatcher-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>  

<beans xmlns="http://www.springframework.org/schema/beans"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xmlns:aop="http://www.springframework.org/schema/aop"

xmlns:context="http://www.springframework.org/schema/context"

xmlns:p="http://www.springframework.org/schema/p"

xmlns:util="http://www.springframework.org/schema/util"

xmlns:task="http://www.springframework.org/schema/task"

xsi:schemaLocation="

   http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd

http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd

http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd

http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.2.xsd

        http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.2.xsd">           

<!-- 컨트롤러 찾아가는 역할 -->

      <bean id="beanNameUrlMapping" class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping">

         <property name="alwaysUseFullPath" value="true"/>

<property name="order" value="1"/>

     </bean>

<!-- 뷰를 결정하는 역할 -->

  <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">

      <property name="prefix" value="/WEB-INF/views/" /> <!-- UserController.java의 mav.setViewName("user/result");의 user -->

      <property name="suffix" value=".jsp" /> <!-- UserController.java의 mav.setViewName("user/result");의 result -->

  </bean>

   

   <bean id="user.userService" class="com.sp.user.UserServiceImpl"/>

   

   <!-- BeanNameUrlHandlerMapping 예가 주소의 /hello.action 을보고 여기로 진입 -->

   <bean name="/hello.action" class="com.sp.user.UserController">

    <property name="userService" ref="user.userService"></property>

   </bean>

 </beans>  

=============================================================================================================================================

applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>  

<beans xmlns="http://www.springframework.org/schema/beans"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xmlns:aop="http://www.springframework.org/schema/aop"

xmlns:context="http://www.springframework.org/schema/context"

xmlns:p="http://www.springframework.org/schema/p"

xmlns:util="http://www.springframework.org/schema/util"

xmlns:task="http://www.springframework.org/schema/task"

xsi:schemaLocation="

   http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd

http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd

http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd

http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.2.xsd

        http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.2.xsd">          

</beans>  

=============================================================================================================================================

UserController.java

package com.sp.user;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.ModelAndView;

import org.springframework.web.servlet.mvc.AbstractController;

/*

 * ModelAndView :  처리결과를 보여줄 뷰와 뷰에 전달할 값을 저장하는 용도

 */

public class UserController extends AbstractController {

private UserService userService;

public void setUserService(UserService userService) {

this.userService = userService;

}

@Override

protected ModelAndView handleRequestInternal(HttpServletRequest req,HttpServletResponse resp) throws Exception {

String s=userService.getMessage(); 

ModelAndView mav=new ModelAndView();

mav.setViewName("user/result"); // <bean id="viewResolver" 어쩌고 에서 사용됨, user는 폴더이름 result는 jsp

mav.addObject("msg",s); //jsp에서 ${msg}로 사용

return mav;

}

}

=============================================================================================================================================

UserService.java

package com.sp.user;

public interface UserService {

public String getMessage();

}

=============================================================================================================================================

UserServiceImpl.java

package com.sp.user;

import java.util.Calendar;

public class UserServiceImpl implements UserService{

@Override

public String getMessage() {

String s="";

int h=Calendar.getInstance().get(Calendar.HOUR_OF_DAY);

if(h>=6&&h<=8)

s="아침이다! 일어나기 싫어 시밤 ㅠㅠ";

else if(h>8&&h<=12)

s="열공 ㄴㄴ해";

else if(h>12&&h<=13)

s="점심..";

else if(h>=13&&h<18)

s="오후 열공....";

else 

s="끝......";

return s;

}

}

=============================================================================================================================================

결과