Spring MVC入门案例

<groupId>com.ysj</groupId>
  <artifactId>springmvc_01_quickstart</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>
  <dependencies>
<!--    servlet依赖-->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>3.1.0</version>
      <scope>provided</scope>
    </dependency>
<!--    Spring MVC 依赖-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>5.2.10.RELEASE</version>
    </dependency>
  </dependencies>
<!--tomcat插件-->
  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.tomcat.maven</groupId>
        <artifactId>tomcat7-maven-plugin</artifactId>
        <version>2.1</version>
        <configuration>
          <port>80</port>
          <path>/</path>
        </configuration>
      </plugin>
    </plugins>
  </build>

//springmvc配置类，本质上还是一个spring配置类
@Configuration
@ComponentScan("com.itheima.controller")
public class SpringMvcConfig {
}

//定义表现层控制器bean
@Controller
public class UserController {
    //设置映射路径为/save，即外部访问路径
    @RequestMapping("/save")
    //设置当前操作返回结果为指定json数据（本质上是一个字符串信息）
    @ResponseBody
    public String save(){
        System.out.println("user save ...");
        return "{'info':'springmvc'}";
    }
    //设置映射路径为/delete，即外部访问路径
    @RequestMapping("/delete")
    @ResponseBody
    public String delete(){
        System.out.println("user save ...");
        return "{'info':'springmvc'}";
    }
}

//web容器配置类
public class test extends AbstractDispatcherServletInitializer {
   //加载Spring MVC配置类，产生SpringMVC容器（本质上还是Spring容器）
    protected WebApplicationContext createServletApplicationContext() {
       //初始化WebApplicationContext对象
        AnnotationConfigWebApplicationContext webApplicationContext = new AnnotationConfigWebApplicationContext();
       //加载指定配置类
        webApplicationContext.register(SpringMvcConfig.class);
        return webApplicationContext;
    }
    //设置由SpringMVC控制器处理的请求映射路径    
    protected String[] getServletMappings() {
        return new String[]{"/"};
    }
    //加载Spring配置类
    protected WebApplicationContext createRootApplicationContext() {
        return null;
    }
}