springMVC注解方式

一、web.xml

• 配置tomcat启动时加载DispatcherServlet
• 配置spring配置文件的路径和名称

<web-app version="4.0"       xmlns="http://xmlns.jcp.org/xml/ns/javaee"       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"       xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee  http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd">       <servlet>             <servlet-name>springmvc</servlet-name>             <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>             <!-- 修改配置文件路径和名称 -->             <init-param>                   <param-name>contextConfigLocation</param-name>                   <param-value>classpath:springmvc.xml</param-value>             </init-param>             <!-- 自启动，tomcat启动时加载，否则第一次访问时加载 -->             <load-on-startup>1</load-on-startup>       </servlet>       <servlet-mapping>             <servlet-name>springmvc</servlet-name>             <url-pattern>/</url-pattern>       </servlet-mapping>   <display-name>Archetype Created Web Application</display-name> </web-app>       二、springmvc.xml

• 配置自动扫描注解
• 配置自动加载mvc注解
• 配置解决中文乱码问题

<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans"       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"       xmlns:aop="http://www.springframework.org/schema/aop"       xmlns:context="http://www.springframework.org/schema/context"       xmlns:mvc="http://www.springframework.org/schema/mvc"       xsi:schemaLocation="http://www.springframework.org/schema/beans         https://www.springframework.org/schema/beans/spring-beans.xsd         http://www.springframework.org/schema/aop         https://www.springframework.org/schema/aop/spring-aop.xsd         http://www.springframework.org/schema/context         https://www.springframework.org/schema/context/spring-context.xsd         http://www.springframework.org/schema/mvc         https://www.springframework.org/schema/mvc/spring-mvc.xsd">              <!-- 扫描注解 -->       <context:component-scan  base-package="top.woldcn"></context:component-scan>               <!-- 加载mvc注解 -->     <mvc:annotation-driven>         <mvc:message-converters register-defaults="true">             <!-- 解决Controller返回中文乱码问题 -->             <bean  class="org.springframework.http.converter.StringHttpMessageConverter">                 <property name="supportedMediaTypes">                     <list>                         <value>text/html;charset=UTF-8</value>                         <value>application/json;charset=UTF-8</value>                     </list>                 </property>             </bean>         </mvc:message-converters>     </mvc:annotation-driven>    </beans>   三、DemoController.java

• @Controller：配置该类为controller
• @GetMapping("/test")：配置url映射
• @ResponseBody：配置方法返回值为返回给前端
• @Autowired：配置自动装载的service

package top.woldcn.controller; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.ResponseBody; import top.woldcn.service.DemoService; @Controller public class DemoController {        @Autowired       private DemoService demoService;              @GetMapping("/test")       @ResponseBody       public String demo() {             return demoService.demo();       } }   四、DemoService.java

• @Service：配置该类为service

package top.woldcn.service; import org.springframework.stereotype.Service; @Service public class DemoService {       public String demo(){             return "this is a test测试";       } }  

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