1、SpringMVC配置类

@Configuration
@ComponentScan("com.itheima.controller")
public class SpringMvcConfig {
}

• @Configuration 声明为配置类
• @ComponentScan("com.itheima.controller") 设置扫描路径

2、SpringConfig配置类

@Configuration
@ComponentScan(value = "com.itheima", excludeFilters = @ComponentScan.Filter(type = FilterType.ANNOTATION, classes = Controller.class))
public class SpringConfig {
}

• excludeFilters 是排除扫描的类，排除是因为和SpringMvc扫描路径重复，

3、ServletContainersInitConfig配置类

public class ServletContainersInitConfig extends AbstractAnnotationConfigDispatcherServletInitializer {@Overrideprotected Class<?>[] getRootConfigClasses() {return new Class[]{SpringConfig.class};}@Overrideprotected Class<?>[] getServletConfigClasses() {return new Class[]{SpringMvcConfig.class};}@Overrideprotected String[] getServletMappings() {return new String[]{"/"};}
}

• getRootConfigClasses 函数 设置SpringConfig配置类
• GetServletConfigClasses 函数 设置SpringMvcConfig配置类
• getServletMappings 函数 设置哪些url让SpringMvc来管理

4、UserController类

@Controller
public class UserController {//2.2 设置当前操作的访问路径@RequestMapping("/save")//2.3 设置当前操作的返回值类型@ResponseBodypublic String save(){System.out.println("user save ...");return "{'module':'springmvc'}";}
}

• 设置为Controller注解表示这个是一个Spring的Bean ，让spring来管理