*如果你需要將應用部署到不支援Servlet3.0容器中 或者 你只是對web.xml情有獨鍾，那我們只能按照傳統的方式，通過web.xml來配置SpringMVC。

*搭建SpringMVC需要在web.xml中註冊DispatcherServlet和ContextLoaderListener，同時他們兩個之間會分別通過上下文引數contextConfigLocation指定一個XML檔案地址來載入Spring應用上下文，而我更傾向於使用Java配置類來載入Spring應用上下文（本文也是如此）。

（1）pom中新增SpringMVC相關jar

1     <
 
dependency>
2       <groupId>org.springframework</groupId>
3       <artifactId>spring-webmvc</artifactId>
4       <version>4.3.21.RELEASE</version>
5     </dependency>

（2）設定web.xml檔案（使用Java配置類來載入Spring應用上下文）

*要在SpringMVC中使用Java配置類來構建Spring應用上下文，我們需要配置DispatcherServlet和ContextLoaderListener的contextClass上下文引數為AnnotationConfigWebApplicationContext，AnnotationConfigWebApplicationContext是WebApplicationContext的實現類，它會載入Java配置類而不是XML檔案

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 3          xmlns="http://java.sun.com/xml/ns/javaee"
 4          xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
 5          id="WebApp_ID" version
 
="2.5">
 6     <!--指定根配置使用Java配置類-->
 7     <context-param>
 8         <param-name>contextClass</param-name>
 9         <param-value>org.springframework.web.context.support.AnnotationConfigWebApplicationContext</param-value>
10     </context-param>
11     <!--指定根配置Java配置類所在路徑-->
12     <context-param>
13         <param-name>contextConfigLocation</param-name>
14         <param-value>cn.coreqi.config.RootConfig</param-value>
15     </context-param>
16     <!--註冊ContextLoaderListener-->
17     <listener>
18         <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
19     </listener>
20     <!--註冊DispatcherServlet-->
21     <servlet>
22         <servlet-name>dispatcherServlet</servlet-name>
23         <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
24         <!--指定DispatcherServlet配置使用Java配置類-->
25         <init-param>
26             <param-name>contextClass</param-name>
27             <param-value>org.springframework.web.context.support.AnnotationConfigWebApplicationContext</param-value>
28         </init-param>
29         <!--指定DispatcherServlet配置Java配置類所在路徑-->
30         <init-param>
31             <param-name>contextConfigLocation</param-name>
32             <param-value>cn.coreqi.config.WebConfig</param-value>
33         </init-param>
34         <!--這是啟動優先順序吧-->
35         <load-on-startup>1</load-on-startup>
36     </servlet>
37     <!--DispatcherServlet對映-->
38     <servlet-mapping>
39         <servlet-name>dispatcherServlet</servlet-name>
40         <url-pattern>/</url-pattern>
41     </servlet-mapping>
42 </web-app>

（3）根配置類（初始化專案，所以沒啥內容）

1 package cn.coreqi.config;
2 
3 import org.springframework.context.annotation.Configuration;
4 
5 @Configuration
6 public class RootConfig {
7 }

（4）DispatcherServlet配置類

 1 package cn.coreqi.config;
 2 
 3 import org.springframework.context.annotation.Bean;
 4 import org.springframework.context.annotation.ComponentScan;
 5 import org.springframework.context.annotation.Configuration;
 6 import org.springframework.web.servlet.ViewResolver;
 7 import org.springframework.web.servlet.config.annotation.*;
 8 import org.thymeleaf.TemplateEngine;
 9 import org.thymeleaf.spring4.SpringTemplateEngine;
10 import org.thymeleaf.spring4.templateresolver.SpringResourceTemplateResolver;
11 import org.thymeleaf.spring4.view.ThymeleafViewResolver;
12 import org.thymeleaf.templatemode.TemplateMode;
13 import org.thymeleaf.templateresolver.ITemplateResolver;
14 
15 @Configuration
16 @EnableWebMvc   //啟用Spring MVC 註解驅動  <mvc:annotation-driven />
17 @ComponentScan("cn.coreqi.controller")
18 public class WebConfig extends WebMvcConfigurerAdapter {
19 
20     //配置Thymeleaf檢視解析器
21     @Bean
22     public ViewResolver viewResolver(TemplateEngine templateEngine){
23         ThymeleafViewResolver viewResolver = new ThymeleafViewResolver();
24         viewResolver.setTemplateEngine(templateEngine);
25         viewResolver.setCharacterEncoding("utf-8");
26         return viewResolver;
27     }
28 
29     //建立模板引擎
30     @Bean
31     public TemplateEngine templateEngine(ITemplateResolver templateResolver){
32         SpringTemplateEngine templateEngine = new SpringTemplateEngine();
33         templateEngine.setTemplateResolver(templateResolver);
34         return templateEngine;
35     }
36 
37     //建立Thymeleaf模板解析器
38     @Bean
39     public ITemplateResolver templateResolver(){
40         SpringResourceTemplateResolver resolver = new SpringResourceTemplateResolver();
41         resolver.setPrefix("/WEB-INF/templates/");
42         resolver.setSuffix(".html");
43         resolver.setTemplateMode(TemplateMode.HTML);
44         resolver.setCacheable(false);
45         resolver.setCharacterEncoding("utf-8");
46         return resolver;
47     }
48 
49     //配置對靜態資源的處理
50     @Override
51     public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
52         configurer.enable();
53     }
54 
55 }