springboot 2.1如何打印 RequestMappin

Spring Boot 2.1 之前 启动的时候日志使用INFO 级别 ，就可以打印 RequestMapping 的信息，示例如下：

logging:
  level:
    root: info

Spring Boot 2.1 之后的版本 使用以上配置，则无法打印出来RequestMapping信息，从源码：org.springframework.web.servlet.handler.AbstractHandlerMethodMapping#detectHandlerMethods这个方法里可以看到这些信息的日志级别是TRACE

    protected void detectHandlerMethods(Object handler) {
        Class<?> handlerType = handler instanceof String ? this.obtainApplicationContext().getType((String)handler) : handler.getClass();
        if (handlerType != null) {
            Class<?> userType = ClassUtils.getUserClass(handlerType);
            Map<Method, T> methods = MethodIntrospector.selectMethods(userType, (method) -> {
                try {
                    return this.getMappingForMethod(method, userType);
                } catch (Throwable var4) {
                    throw new IllegalStateException("Invalid mapping on handler class [" + userType.getName() + "]: " + method, var4);
                }
            });
            if (this.logger.isTraceEnabled()) {
                this.logger.trace(this.formatMappings(userType, methods));
            }

            methods.forEach((method, mapping) -> {
                Method invocableMethod = AopUtils.selectInvocableMethod(method, userType);
                this.registerHandlerMethod(handler, invocableMethod, mapping);
            });
        }

    }

所以要打印Controller里面的 RequestMapping信息需要把org.springframework.web打印日志的格式设置为trace，示例如下：
最简单的操作root设置为trace，

logging:
  level:
    root: trace

但是root设置为trace这样会显示出太多trace，debug信息，所以只为RequestMapping所对应的org.springframework.web里日志级别设置为trace：

logging:
  level:
    org.springframework.web: trace

日志显示的样式如下：

[2020-02-20 16:49:56.056] TRACE 4066 [titans001-c0a8016e-439496-40026,null] [main] [org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping] : 
    c.z.t.p.c.HttpController:
    {GET /http/get}: get(String,HttpServletRequest)
    {POST /http/update}: update(Object,HttpServletRequest)
    {DELETE /http/delete}: delete(Object,HttpServletRequest)
    {PUT /http/insert}: insert(Object,HttpServletRequest)