springmvc三个处理器映射器(三)

男娘i 2022-06-12 04:26 136阅读 0赞

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>
         
        <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][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">
    
            
            <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"></bean>
    
            <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"></bean>
    
    
            
            <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"></bean>
    
            <bean name="/user.do" class="com.study.controller.UserController"></bean>
    
            
            <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][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>
    
            
            <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"></bean>
    
    
            
            <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][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>
    
            
            <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"></bean>
    
    
            
            <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.

[http_localhost_8080_springmvc_01_user.do]: http://localhost:8080/springmvc_01/user.do
[http_localhost_8080_springmvc_01_user2.do]: http://localhost:8080/springmvc_01/user2.do
[http_localhost_8080_springmvc_01_userController.do]: http://localhost:8080/springmvc_01/userController.do