作用：查看应用请求对应的ur和方法l情况
实例：
RequestMappingHandlerMapping mapping =applicationContext.getBean("requestMappingHandlerMapping",RequestMappingHandlerMapping.class);
Map<RequestMappingInfo, HandlerMethod> map = requestMappingHandlerMapping.getHandlerMethods();
springboot-RequestMappingHandlerMapping
原文：https://www.cnblogs.com/lichangyunnianxue/p/9761819.html