springMvc之拦截器的使用

自定义拦截器，实现HandlerInterceptor接口

publicclassJWTInterceptorimplementsHandlerInterceptor{@OverridepublicbooleanpreHandle(HttpServletRequest request, HttpServletResponse response, Object handler)throws Exception{   String token= request.getHeader("token");   Map<String,Object> map=newHashMap<>();try{     JWTUtils.verify(token);returntrue;}catch(TokenExpiredException e){     map.put("state",false);     map.put("msg","Token已经过期!!!");}catch(SignatureVerificationException e){     map.put("state",false);     map.put("msg","签名错误!!!");}catch(AlgorithmMismatchException e){     map.put("state",false);     map.put("msg","加密算法不匹配!!!");}catch(Exception e){     e.printStackTrace();     map.put("state",false);     map.put("msg","无效token~~");}   String json=newObjectMapper().writeValueAsString(map);   response.setContentType("application/json;charset=UTF-8");   response.getWriter().println(json);returnfalse;}}

注册拦截器,实现WebMvcConfigurer ，将自定义的拦截器注册进来

@ConfigurationpublicclassInterceptorConfigimplementsWebMvcConfigurer{@OverridepublicvoidaddInterceptors(InterceptorRegistry registry){         registry.addInterceptor(newJwtTokenInterceptor()).excludePathPatterns("/user/**")// 放行.addPathPatterns("/**");// 拦截除了"/user/**的所有请求路径}}