SPRING IN ACTION 第4版笔记-第七章Advanced Spring MVC-002- 在xml中引用Java配置文件，声明DispatcherServlet、ContextLoaderListener

一、所有声明都用xml

1.

 <?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
 http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
     <context-param>
         <param-name>contextConfigLocation</param-name>
         <param-value>/WEB-INF/spring/root-context.xml</param-value>
     </context-param>
     <listener>
         <listener-class>
             org.springframework.web.context.ContextLoaderListener
         </listener-class>
     </listener>
     <servlet>
         <servlet-name>appServlet</servlet-name>
         <servlet-class>
             org.springframework.web.servlet.DispatcherServlet
         </servlet-class>
         <load-on-startup>1</load-on-startup>
     </servlet>
     <servlet-mapping>
         <servlet-name>appServlet</servlet-name>
         <url-pattern>/</url-pattern>
     </servlet-mapping>
 </web-app>

如果没有指定DispatcherServlet 的配置文件，则会自动找根路径下的"servlet名称"-context.xml。DispatcherServlet loads its application context with beans defined in a file whose name is based on the servlet name. In listing 7.3, the servlet is named appServlet .Therefore, DispatcherServlet loads its application context from an XML file at /WEB-INF /appServlet-context.xml.

当然也可以指定配置文件

 <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>

二、在xml中引入Jav配置文件

1.如何在xml中引入以 @Configuration 注解的Java配置文件呢？

To use Java-based configuration in Spring MVC , you need to tell DispatcherServlet and ContextLoaderListener to use AnnotationConfigWebApplicationContext , an implementation of WebApplicationContext that loads Java configuration classes instead of XML . You can do that by setting the contextClass context parameter and initialization parameter for DispatcherServlet .

 <?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
 http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
     <context-param>
         <param-name>contextClass</param-name>
         <param-value>
             org.springframework.web.context.support.AnnotationConfigWebApplicationContext
         </param-value>
     </context-param>
     <context-param>
         <param-name>contextConfigLocation</param-name>
         <param-value>com.habuma.spitter.config.RootConfig</param-value>
     </context-param>
     <listener>
         <listener-class>
             org.springframework.web.context.ContextLoaderListener
         </listener-class>
     </listener>
     <servlet>
         <servlet-name>appServlet</servlet-name>
         <servlet-class>
             org.springframework.web.servlet.DispatcherServlet
         </servlet-class>
         <init-param>
             <param-name>contextClass</param-name>
             <param-value>
                 org.springframework.web.context.support.AnnotationConfigWebApplicationContext
             </param-value>
         </init-param>
         <init-param>
             <param-name>contextConfigLocation</param-name>
             <param-value>
                 com.habuma.spitter.config.WebConfigConfig
             </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>