标签：nbsp eth request org style ddp handle servlet tostring
1.拦截器中handler cannot be cast to HandlerMethod
java.lang.ClassCastException: org.springframework.web.servlet.resource.ResourceHttpRequestHandler cannot be cast to org.springframework.web.method.HandlerMethod
public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object handler) throws Exception { //此处报错 HandlerMethod handlerMethod = (HandlerMethod) handler; }
原因就在于，spring boot 2.0对静态资源也进行了拦截，当拦截器拦截到请求之后，但controller里并没有对应的请求时，该请求会被当成是对静态资源的请求。此时的handler就是 ResourceHttpRequestHandler，就会抛出上述错误。
解决办法：
1.拦截器那里排除静态资源的请求路径
registry.addInterceptor(new MyInterceptor()).addPathPatterns("/xx/**") .excludePathPatterns("/xx/**");
2. instanceof关键字进行判断。
if(handler instanceof ResourceHttpRequestHandler) { logger.info("---------ResourceHttpRequestHandler-------" + handler.toString() + "------------"); }else if(handler instanceof HandlerMethod){ logger.info("--------HandlerMethod--------" + handler.toString() + "------------"); }
标签：nbsp eth request org style ddp handle servlet tostring
原文地址：https://www.cnblogs.com/yangfei-beijing/p/9593654.html
