SpringMVC的基本使用

SpringMVC的基本使用

1. 导包

   <!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
   <dependency>
       <groupId>javax.servlet</groupId>
       <artifactId>javax.servlet-api</artifactId>
       <version>4.0.1</version>
   </dependency>
   
   <!-- https://mvnrepository.com/artifact/javax.servlet.jsp/jsp-api -->
   <dependency>
       <groupId>javax.servlet.jsp</groupId>
       <artifactId>jsp-api</artifactId>
       <version>2.1</version>
   </dependency>
   
   <dependency>
       <groupId>javax.servlet</groupId>
       <artifactId>jstl</artifactId>
       <version>1.2</version>
   </dependency>
   <!-- https://mvnrepository.com/artifact/taglibs/standard -->
   <dependency>
       <groupId>taglibs</groupId>
       <artifactId>standard</artifactId>
       <version>1.1.2</version>
   </dependency>
   <!--Junit        -->
   <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
       <version>4.13.1</version>
   </dependency>
   <!--spring      -->
   <dependency>
       <groupId>org.springframework</groupId>
       <artifactId>spring-webmvc</artifactId>
       <version>5.3.3</version>
   </dependency>
   
   <build>
       <resources>
           <resource>
               <directory>src/main/resources</directory>
               <includes>
                   <include>**/*.properties</include>
                   <include>**/*.xml</include>
               </includes>
               <filtering>true</filtering>
           </resource>
   
           <resource>
               <directory>src/main/java</directory>
               <includes>
                   <include>**/*.properties</include>
                   <include>**/*.xml</include>
               </includes>
               <filtering>true</filtering>
           </resource>
       </resources>
   </build>
   

2. web配置文件

   <!--配置 DispatcherServlet   -->
   <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-servlet.xml</param-value>
       </init-param>
       <load-on-startup>1</load-on-startup>
   </servlet>
   
   <servlet-mapping>
       <servlet-name>springmvc</servlet-name>
       <url-pattern>/</url-pattern>
   </servlet-mapping>
   

3. springmvc-servlet.xml文件（spring的配置文件）

   <?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
                              https://www.springframework.org/schema/beans/spring-beans.xsd">
   
       <!--处理器映射器-->
       <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"/>
       <!--处理器适配器-->
       <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"/>
       <!--视图解析器-->
       <bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
           <!-- 前缀       -->
           <property name="prefix" value="/WEB-INF/jsp/"/>
           <!-- 后缀      -->
           <property name="suffix" value=".jsp"/>
       </bean>
   </beans>
   

4. 实现业务类

   public class Hello implements Controller {
       @Override
       public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception {
           ModelAndView mv = new ModelAndView();
           String msg = "hello SpringMVC";
           mv.addObject("msg",msg);
           return mv;
       }
   }
   

5. 在springmvc-servlet.xml配置文件中注册bean

   <bean id="/hello" class="cn.gbl.controller.Hello"/>
   

注意： 若确信代码没有问题但出现404，解决方式如下：

​ 点击Artifacts，在项目的WEB-INF目录下创建lib文件夹

然后点击+号，将 依赖导入即可。