对于Spring MVC的DispatcherServlet配置方式,传统的是基于XML方式的,也就是官方说明的XML-based,如下:
<servlet> <servlet-name>dispatcher</servlet-name> <servlet-class> org.springframework.web.servlet.DispatcherServlet </servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/spring/dispatcher-config.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>dispatcher</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping>
但是Spring文档建议我们采用code-based这种方式,当然,核心就是实现WebApplicationInitializer这个接口,查看这个接口的源码,里面也非常简单,只有一个方法,传入的参数是ServletContext:
void onStartup(ServletContext servletContext) throws ServletException;
下面是一个小例子:
1.项目结构:
2.MyWebAppInitializer.java
public class MyWebAppInitializer implements WebApplicationInitializer{ public void onStartup(ServletContext servletContext) throws ServletException { XmlWebApplicationContext appContext = new XmlWebApplicationContext(); appContext.setConfigLocation("classpath:spring-mvc.xml"); ServletRegistration.Dynamic dispatcher = servletContext.addServlet("dispatcher", new DispatcherServlet(appContext)); dispatcher.setLoadOnStartup(1); dispatcher.addMapping("/"); } }
3.UserController.java
@Controller public class UserController { @RequestMapping("/show") public String show(){ return "show"; } }
4.spring-mvc.xml
<?xml version="1.0" encoding="GBK"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:cache="http://www.springframework.org/schema/cache" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:jpa="http://www.springframework.org/schema/data/jpa" xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.1.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd http://www.springframework.org/schema/cache http://www.springframework.org/schema/cache/spring-cache-4.1.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd"> <context:component-scan base-package="com.aijava.springcode"/> <mvc:annotation-driven /> <!--配置视图解析器--> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/"/> <property name="suffix" value=".jsp"/> </bean> </beans>
5.show.jsp
简单的一句打印:
<body> show page; </body>
6.启动Tomcat后输入url后发现是会出现结果的,code-based是成功的!
时间: 2024-10-10 23:05:33