web.xml

08 Jan 2018

Reading time ~2 minutes

스프링 컨텍스트 는 루트와 자식컨텍스트로 나눠진다.
전통적인 XML 기반 접근 방식
웹 응용 프로그램을 작성하는 대부분의 Spring 사용자는 Spring(DispatcherServlet)을 등록해야한다.
WEB-INF/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"
 xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
 id="WebApp_ID" version="3.0">
 <display-name>osp_sdn</display-name>
 <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>
 <filter>
   <filter-name>HTMLTagFilter</filter-name>
   <filter-class>egovframework.rte.ptl.mvc.filter.HTMLTagFilter</filter-class>
 </filter>
 <filter-mapping>
   <filter-name>HTMLTagFilter</filter-name>
   <url-pattern>*.do</url-pattern>
 </filter-mapping>
 <filter-mapping>
   <filter-name>HTMLTagFilter</filter-name>
   <url-pattern>*.json</url-pattern>
 </filter-mapping>
 <!-- <filter> <filter-name>springSecurityFilterChain</filter-name> <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
   </filter> <filter-mapping> <filter-name>springSecurityFilterChain</filter-name>
   <url-pattern>/*</url-pattern> </filter-mapping> <listener> <listener-class>org.springframework.security.web.session.HttpSessionEventPublisher</listener-class>
   </listener> -->
 <filter>
   <filter-name>AuthenticationFilter</filter-name>
   <filter-class>osp.sdn.common.web.filter.AuthenticationFilter</filter-class>
 </filter>
 <filter-mapping>
   <filter-name>AuthenticationFilter</filter-name>
   <url-pattern>*.do</url-pattern>
 </filter-mapping>
 <filter-mapping>
   <filter-name>AuthenticationFilter</filter-name>
   <url-pattern>*.json</url-pattern>
 </filter-mapping>

 <context-param>
   <param-name>contextConfigLocation</param-name>
   <param-value>classpath*:egovframework/spring/context-*.xml</param-value>
 </context-param>
 <listener>
   <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
 </listener>
 <servlet>
   <servlet-name>action</servlet-name>
   <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
   <init-param>
     <param-name>contextConfigLocation</param-name>
     <param-value>/WEB-INF/config/egovframework/springmvc/dispatcher-servlet.xml</param-value>
   </init-param>
   <load-on-startup>1</load-on-startup>
 </servlet>
 <servlet-mapping>
   <servlet-name>action</servlet-name>
   <url-pattern>*.do</url-pattern>
 </servlet-mapping>
 <servlet-mapping>
   <servlet-name>action</servlet-name>
   <url-pattern>*.json</url-pattern>
 </servlet-mapping>
 <mime-mapping>
   <extension>eot</extension>
   <mime-type>application/vnd.ms-fontobject</mime-type>
 </mime-mapping>
 <mime-mapping>
   <extension>otf</extension>
   <mime-type>font/opentype</mime-type>
 </mime-mapping>
 <mime-mapping>
   <extension>ttf</extension>
   <mime-type>font/truetype</mime-type>
 </mime-mapping>
 <mime-mapping>
   <extension>woff</extension>
   <mime-type>application/font-woff</mime-type>
 </mime-mapping>
 <welcome-file-list>
   <welcome-file>index.html</welcome-file>
   <welcome-file>index.do</welcome-file>
   <welcome-file>index.jsp</welcome-file>
 </welcome-file-list>
 <login-config>
   <auth-method>BASIC</auth-method>
 </login-config>
 <session-config>
   <session-timeout>60</session-timeout><!-- 분 -->
 </session-config>
 <error-page>
   <exception-type>java.lang.Throwable</exception-type>
   <location>/common/error.jsp</location>
 </error-page>
 <error-page>
   <error-code>404</error-code>
   <location>/common/error.jsp</location>
 </error-page>
 <error-page>
   <error-code>500</error-code>
   <location>/common/error.jsp</location>
 </error-page>
   </web-app>

ContextLoaderListener

계층별로 나눈 xml 설정파일이 있다고 가정할 때 web.xml에서 모두 load되도록 등록할 때 사용. 서블릿이전에 서블릿 초기화하는 용도록 쓰이며 contextConfigLocation 라는 파라미터를 써서, Context Loader가 load할 xml설정파일을 등록할 수 있다.

web.xml에 <context-param> 문장이 빠지게 되면 default로, /WEB-INF/applicationContext.xml (spring 설정파일) 을 쓰게 된다. 경로를 잘못 입력한 경우 /WEB-INF/applicationContext.xml 을 찾을 수 없다는 오류메세지를 볼 수 있을 것이다.

예시1

 <context-param>
   <param-name>contextConfigLocation</param-name>
   <param-value>classpath*:egovframework/spring/context-*.xml</param-value>
 </context-param>
 <listener>
   <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
 </listener>

예시2

 <context-param>
   <param-name>contextConfigLocation</param-name>
   <param-value>
     /WEB-INF/context/context-datasoruce.xml
     /WEB-INF/context/context-aspects.xml
   </param-value>
 </context-param>
 <listener>
   <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
 </listener>

DispatcherServlet

기본적으로 DispatcherServlet 은 모든 Spring MVC 애플리케이션 의 진입 점이다 .
이것의 목적은 HTTP 요청 을 가로 챈 다음 HTTP 요청을 처리하는 방법을 알 수있는 올바른 구성 요소에 요청을 전달하는 것이다.
레거시 Spring 프로젝트 를 다루는 경우 XML 구성 을 찾는 것이 일반적 이며
**Spring 3.1 까지는 DispatcherServlet 을 구성하는 유일한 방법 은 WEB-INF / web.xml 파일 을 사용하는 것이었다. **

   <servlet>
 <servlet-name>action</servlet-name>
 <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
 <init-param>
   <param-name>contextConfigLocation</param-name>
   <param-value>/WEB-INF/config/egovframework/springmvc/dispatcher-servlet.xml</param-value>
 </init-param>
 <load-on-startup>1</load-on-startup>
   </servlet>
   <servlet-mapping>
 <servlet-name>action</servlet-name>
 <url-pattern>*.do</url-pattern>
   </servlet-mapping>
   <servlet-mapping>
 <servlet-name>action</servlet-name>
 <url-pattern>*.json</url-pattern>
   </servlet-mapping>

ContextLoaderListener 에 해당하는 부분이 root context 가 되고
DispatcherServlet 에 해당하는 부분이 child context 가 된다.