springmvc三个处理器映射器(三)

以下web.xml配置如下,项目名为springmvc_01

<?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" 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>springmvc_01</display-name>  <servlet>    <servlet-name>springmvc</servlet-name>    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>     <!-- 默认加载方式       默认加载必须规范：       * 文件命名：servlet-name-servlet.xml====springmvc-servlet.xml       * 路径规范：必须在WEB-INF目录下面   -->    <init-param>        <param-name>contextConfigLocation</param-name>        <param-value>classpath:springmvc.xml</param-value>    </init-param>  </servlet>  <servlet-mapping>    <servlet-name>springmvc</servlet-name>    <url-pattern>*.do</url-pattern>  </servlet-mapping>  <welcome-file-list>    <welcome-file>index.jsp</welcome-file>  </welcome-file-list></web-app>

1. BeanNameUrlHandlerMapping (默认)
根据url请求去匹配bean的name属性url，从而获取Controller
http://localhost:8080/springmvc_01/user.do

<?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:mvc="http://www.springframework.org/schema/mvc"    xmlns:context="http://www.springframework.org/schema/context"    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"    xsi:schemaLocation="http://www.springframework.org/schema/beans         http://www.springframework.org/schema/beans/spring-beans-3.2.xsd         http://www.springframework.org/schema/mvc         http://www.springframework.org/schema/mvc/spring-mvc-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/aop         http://www.springframework.org/schema/aop/spring-aop-3.2.xsd         http://www.springframework.org/schema/tx         http://www.springframework.org/schema/tx/spring-tx-3.2.xsd">        <!-- 配置处理器映射器,springmvc默认的处理器映射器        BeanNameUrlHandlerMapping：根据bean(自定义Controler)的name属性的url去寻找hanler(Action:Controller)         -->        <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"></bean>        <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"></bean>        <!-- 配置处理器适配器执行Controlelr ,springmvc默认的SimpleControllerHandlerAdapter:执行Controller-->        <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"></bean>        <bean name="/user.do" class="com.study.controller.UserController"></bean>        <!-- 配置sprigmvc视图解析器：解析逻辑试图              后台返回逻辑试图：index            视图解析器解析出真正物理视图：前缀+逻辑试图+后缀====/WEB-INF/jsps/index.jsp        -->        <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">            <property name="prefix" value="/WEB-INF/jsps/"></property>            <property name="suffix" value=".jsp"></property>        </bean></beans>

2.SimpleUrlHandlerMapping(使用简单的URL来映射)

根据浏览器url匹配简单url的key，key又根据值找到Controller的id匹配对应的Controller
http://localhost:8080/springmvc_01/user2.do

<?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:mvc="http://www.springframework.org/schema/mvc"    xmlns:context="http://www.springframework.org/schema/context"    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"    xsi:schemaLocation="http://www.springframework.org/schema/beans         http://www.springframework.org/schema/beans/spring-beans-3.2.xsd         http://www.springframework.org/schema/mvc         http://www.springframework.org/schema/mvc/spring-mvc-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/aop         http://www.springframework.org/schema/aop/spring-aop-3.2.xsd         http://www.springframework.org/schema/tx         http://www.springframework.org/schema/tx/spring-tx-3.2.xsd">        <bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">            <property name="mappings">                <props>                    <prop key="/user2.do">userController</prop>                </props>            </property>        </bean>        <bean id="userController" class="com.study.controller.UserController"></bean>        <!-- 配置处理器适配器执行Controlelr ,springmvc默认的SimpleControllerHandlerAdapter:执行Controller-->        <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"></bean>        <!-- 配置sprigmvc视图解析器：解析逻辑试图              后台返回逻辑试图：index            视图解析器解析出真正物理视图：前缀+逻辑试图+后缀====/WEB-INF/jsps/index.jsp        -->        <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">            <property name="prefix" value="/WEB-INF/jsps/"></property>            <property name="suffix" value=".jsp"></property>        </bean></beans>

3. ControllerClassNameHandlerMapping (控制器名称访问,首字母小写)

根据类名（UserController）类名.do来访问,类名首字母小写.这种方式一般不采用,因为一旦控制器名称更改的话,访问路径也得跟着更改,变动性较大.
http://localhost:8080/springmvc_01/userController.do

<?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:mvc="http://www.springframework.org/schema/mvc"    xmlns:context="http://www.springframework.org/schema/context"    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"    xsi:schemaLocation="http://www.springframework.org/schema/beans         http://www.springframework.org/schema/beans/spring-beans-3.2.xsd         http://www.springframework.org/schema/mvc         http://www.springframework.org/schema/mvc/spring-mvc-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/aop         http://www.springframework.org/schema/aop/spring-aop-3.2.xsd         http://www.springframework.org/schema/tx         http://www.springframework.org/schema/tx/spring-tx-3.2.xsd">    <bean class="org.springframework.web.servlet.mvc.support.ControllerClassNameHandlerMapping"></bean>        <bean class="com.study.controller.UserController"></bean>        <!-- 配置处理器适配器执行Controlelr ,springmvc默认的SimpleControllerHandlerAdapter:执行Controller-->        <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"></bean>        <!-- 配置sprigmvc视图解析器：解析逻辑试图              后台返回逻辑试图：index            视图解析器解析出真正物理视图：前缀+逻辑试图+后缀====/WEB-INF/jsps/index.jsp        -->        <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">            <property name="prefix" value="/WEB-INF/jsps/"></property>            <property name="suffix" value=".jsp"></property>        </bean></beans>

注:三个处理器映射器是可以同时存在的.