Leopard Web --web.xml

        做web开发的同学，肯定都熟悉web.xml这个文件。比如servlet、filter、Listener等都是在这个文件里配置的。比如你用了struts、spring等框架，都需要在web.xml中进行配置。我们来看一个web.xml的配置。

        

<?xml version="1.0" encoding="UTF-8"?>
<web-app 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_3_0.xsd"
	version="3.0" id="leopard">

	<display-name>example</display-name>

	<absolute-ordering>
		<name>leopard_webfragment</name>
	</absolute-ordering>

</web-app>

    

       我擦，擦亮眼睛来看？这是什么配置？好像没有见过！你刚说的servlet、filter、listerner的配置呢？

　　是的，你没有看错？Leopard的xml文件就是这么简单了。细节被我们隐藏了，隐藏到leopard_webfragment里了。这就是servlet3.0的好处之一。

    那么leopard_webfragment里究竞配置了些什么东西呢？

  

<?xml version="1.0" encoding="UTF-8"?>
<web-fragment 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-fragment_3_0.xsd"
	version="3.0">
	<name>leopard_webfragment</name>

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

	<error-page>
		<error-code>500</error-code>
		<location>/error.do</location>
	</error-page>

	<jsp-config>
		<jsp-property-group>
			<url-pattern>*.jsp</url-pattern>
			<el-ignored>false</el-ignored>
			<page-encoding>utf-8</page-encoding>
		</jsp-property-group>
	</jsp-config>
	<!-- -->
	<context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>
			classpath:/leopard-web/applicationContext.xml
		</param-value>
	</context-param>
	<context-param>
		<param-name>contextClass</param-name>
		<param-value>io.leopard.web.LeopardXmlWebApplicationContext</param-value>
	</context-param>
	<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>
	<servlet>
		<servlet-name>web</servlet-name>
		<servlet-class>io.leopard.web.mvc.LeopardDispatcherServlet</servlet-class>
		<init-param>
			<param-name>contextConfigLocation</param-name>
			<param-value>/WEB-INF/web-servlet.xml</param-value>
		</init-param>
		<load-on-startup>1</load-on-startup>
	</servlet>
	<servlet-mapping>
		<servlet-name>web</servlet-name>
		<url-pattern>/</url-pattern>
	</servlet-mapping>
	<!-- Character Encoding filter -->
	<filter>
		<filter-name>CharacterEncodingFilter</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>
		<init-param>
			<param-name>forceEncoding</param-name>
			<param-value>true</param-value>
		</init-param>
	</filter>
	<filter-mapping>
		<filter-name>CharacterEncodingFilter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>
	<!-- 用户信息包装 -->
	<filter>
		<filter-name>leopardFilter</filter-name>
		<filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
		<init-param>
			<param-name>targetFilterLifecycle</param-name>
			<param-value>true</param-value>
		</init-param>
	</filter>
	<filter-mapping>
		<filter-name>leopardFilter</filter-name>
		<url-pattern>*.do</url-pattern>
	</filter-mapping>
</web-fragment>

  你想要的我们都帮你配置了？这就是约定优于配置的好处！