一.HandleMapping和HandlerAdapter的讲解
HandleMapping:处理映射器,可以理解为为请求的url查找对应的Controller类.
HandlerAdapter:可以简单的理解为调用Controller中的方法。
HandlerMapping+HnadlerAdapter：找到url所对应的Controller Method。
二.SpringMVC中的HandleMapping有三种.
BeanNameUrlHandlerMapping:根据bean的名称路径访问Controller类
SimpleUrlHandlerMapping:根据url找到对应的bean的id
ControllerClassNameHandlerMapping: 根据类的名称找到对应Controller类.
三.HandleMapping的三种示例.
工程结构图
1.网页代码
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Index Page</title> </head> <body> <a href="simple.do">Simple Url Controller</a> <br/> <a href="index.do">BeanName Url Controller</a> <br/> <a href="myController.do">ControllerClassName Controller</a> </body> </html>
2.springMVC配置文件
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"> <!-- 讲解HandleMapping 1.BeanNameUrlHandlerMapping :根据url找到对应的bean name名 --> <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"></bean> <bean name="/index.do" class="com.eduask.ykq.controller.BeanNameController"></bean> <!-- 2.SimpleUrlHandlerMapping: --> <bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping"> <property name="mappings"> <props> <prop key="simgle.do">a</prop> </props> </property> </bean> <bean id="a" class="com.eduask.ykq.controller.SimpleUrlController"></bean> <!-- 3.ControllerClassNameHandleMapping: --> <bean class="org.springframework.web.servlet.mvc.support.ControllerClassNameHandlerMapping"></bean> <bean class="com.eduask.ykq.controller.MyController"></bean> <!-- 视图解析器--> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/view/"></property> <property name="suffix" value=".jsp"></property> </bean> </beans>
3.web.xml文件
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1"> <display-name>SpringMVC1</display-name> <servlet> <servlet-name>springMVC</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <!-- classpath:========>/web-inf/class/ (源文件下的文件经过编译后产生的字节码文件所在的文件夹) --> <param-value>classpath:SpringMVC.xml</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>springMVC</servlet-name> <url-pattern>*.do</url-pattern> </servlet-mapping> </web-app>