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  • 利用WebApplicationInitializer配置SpringMVC取代web.xml

    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!

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  • 原文地址:https://www.cnblogs.com/liuruowang/p/5694784.html
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