SpringBoot 确实为我们做了很多事情， 但有时候我们想要自己定义一些Handler，Interceptor，ViewResolver，MessageConverter，该怎么做呢。在Spring Boot 1.5版本都是靠重写WebMvcConfigurerAdapter的方法来添加自定义拦截器，消息转换器等。SpringBoot 2.0 后，该类被标记为@Deprecated。因此我们只能靠实现WebMvcConfigurer接口来实现。接下来让我们来看看这个接口类吧！（列举下常用的方法供参考）
/** * @Author Lwh * @Date 2019/10/30 * @Description 实现WebMvcConfigurer接口， */ @Configuration public class WebConfig implements WebMvcConfigurer { /** * 添加类型转换器和格式化器 * @param registry */ @Override public void addFormatters(FormatterRegistry registry) { registry.addFormatterForFieldType(LocalDate.class, new USLocalDateFormatter()); } /** * 跨域支持 * cors协议解决跨域问题 */ @Override public void addCorsMappings(CorsRegistry registry) { registry.addMapping("/**") .allowedOrigins("*") .allowCredentials(true) .allowedMethods("GET", "POST", "DELETE", "PUT") .maxAge(3600 * 24); } /** * 添加静态资源--过滤swagger-api (开源的在线API文档) * @param registry */ @Override public void addResourceHandlers(ResourceHandlerRegistry registry) { //过滤swagger registry.addResourceHandler("swagger-ui.html") .addResourceLocations("classpath:/META-INF/resources/"); registry.addResourceHandler("/webjars/**") .addResourceLocations("classpath:/META-INF/resources/webjars/"); registry.addResourceHandler("/swagger-resources/**") .addResourceLocations("classpath:/META-INF/resources/swagger-resources/"); registry.addResourceHandler("/swagger/**") .addResourceLocations("classpath:/META-INF/resources/swagger*"); //本应用 registry.addResourceHandler("/assets/**").addResourceLocations("classpath:/assets/"); } } /** * 配置消息转换器--这里我用的是alibaba 开源的 fastjson * @param converters */ @Override public void configureMessageConverters(List<HttpMessageConverter<?>> converters) { //1.需要定义一个convert转换消息的对象; FastJsonHttpMessageConverter fastJsonHttpMessageConverter = new FastJsonHttpMessageConverter(); //2.添加fastJson的配置信息，比如：是否要格式化返回的json数据; FastJsonConfig fastJsonConfig = new FastJsonConfig(); fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat, SerializerFeature.WriteMapNullValue, SerializerFeature.WriteNullStringAsEmpty, SerializerFeature.DisableCircularReferenceDetect, SerializerFeature.WriteNullListAsEmpty, SerializerFeature.WriteDateUseDateFormat); //3处理中文乱码问题 List<MediaType> fastMediaTypes = new ArrayList<>(); fastMediaTypes.add(MediaType.APPLICATION_JSON_UTF8); //4.在convert中添加配置信息. fastJsonHttpMessageConverter.setSupportedMediaTypes(fastMediaTypes); fastJsonHttpMessageConverter.setFastJsonConfig(fastJsonConfig); //5.将convert添加到converters当中. converters.add(fastJsonHttpMessageConverter); } /** * 配置拦截器实现api接口鉴权 */ @Override public void addInterceptors(InterceptorRegistry registry) { registry.addInterceptor(new RestApiInteceptor()).addPathPatterns("/api/**"); } }Rest Api接口鉴权Interceptor
/** * Rest Api接口鉴权 * * @author crm * @Date 2018/7/20 23:11 */ public class RestApiInteceptor extends HandlerInterceptorAdapter { @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { if (handler instanceof org.springframework.web.servlet.resource.ResourceHttpRequestHandler) { return true; } return check(request, response); } private boolean check(HttpServletRequest request, HttpServletResponse response) { if (request.getServletPath().equals(JwtConstants.AUTH_PATH)) { return true; } final String requestHeader = request.getHeader(JwtConstants.AUTH_HEADER); String authToken; if (requestHeader != null && requestHeader.startsWith("Bearer ")) { authToken = requestHeader.substring(7); //验证token是否过期,包含了验证jwt是否正确 try { boolean flag = JwtTokenUtil.isTokenExpired(authToken); if (flag) { RenderUtil.renderJson(response, new ErrorResponseData(BizExceptionEnum.TOKEN_EXPIRED.getCode(), BizExceptionEnum.TOKEN_EXPIRED.getMessage())); return false; } } catch (JwtException e) { //有异常就是token解析失败 RenderUtil.renderJson(response, new ErrorResponseData(BizExceptionEnum.TOKEN_ERROR.getCode(), BizExceptionEnum.TOKEN_ERROR.getMessage())); return false; } } else { //header没有带Bearer字段 RenderUtil.renderJson(response, new ErrorResponseData(BizExceptionEnum.TOKEN_ERROR.getCode(), BizExceptionEnum.TOKEN_ERROR.getMessage())); return false; } return true; } }