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Springmvc中的HandlerAdaptor执行流程
今天讲解一下在Springmvc中的HandlerAdaptor执行流程,明白这个过程,你就能画出下面的图:
接下来我们就来看看具体的实现过程吧。
1.0在DispatcherServlet中找到getHandlerAdapter()方法
2.0进入getHandlerAdapter()具体的方法实现内
3.0获取ModelAndView:
4.0真正的执行者:
简单地了解一下,还是用具体的代码来加强印象吧。
先把项目的架构搭建完成,依赖节点导入,进行下面的操作。
MAVEN所需的依赖节点:
<dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.3</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>4.3.3.RELEASE</version> </dependency> <!--spring web jar 包--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>4.3.3.RELEASE</version> </dependency> <!--springmvc jar 包--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>4.3.3.RELEASE</version> </dependency> <!--spring-ormjar 包--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-orm</artifactId> <version>4.3.3.RELEASE</version> </dependency> <dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjweaver</artifactId> <version>1.8.7</version> </dependency> <!--servlet api包--> <dependency> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> <version>2.5</version> </dependency> <dependency> <groupId>org.apache.taglibs</groupId> <artifactId>taglibs-standard-spec</artifactId> <version>1.2.1</version> </dependency> <dependency> <groupId>org.apache.taglibs</groupId> <artifactId>taglibs-standard-impl</artifactId> <version>1.2.1</version> </dependency> </dependencies> <build> <resources> <resource> <directory>src/main/java</directory> <includes> <include>**/*.xml</include> <include>**/*.properties</include> </includes> </resource> </resources> </build>
web.xml的配置:
<?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" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation=" http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5"> <display-name>Archetype Created Web Application</display-name> <!--中央调度器--> <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:applicationContextfirst.xml</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>springmvc</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app>
示例一:实现简单的访问
准备名称为FirstController的类
public class FirstController implements Controller{ /*第一个示例实现Controller接口*/ public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception { ModelAndView av=new ModelAndView(); av.setViewName("index"); return av; } }
编写applicationfirst.xml:
<!--第一种方式实现--> <!--处理器--> <bean id="firstController" class="cn.happy.controller.FirstController"></bean> <!--处理器映射器--> <bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping"> <property name="mappings"> <props> <prop key="/hello">firstController</prop> </props> </property> </bean> <!--视图解析器--> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value=http://www.mamicode.com/"/"></property> <property name="suffix" value=http://www.mamicode.com/".jsp"></property> </bean>
效果图:
Springmvc中的HandlerAdaptor执行流程
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