spring-boot添加自定义拦截器

spring-boot中的WebMvcConfigurerAdapter类提供了很多自定义操作的方法，先贴出来大家看看

 package org.springframework.web.servlet.config.annotation;

 import java.util.List;
 import org.springframework.format.FormatterRegistry;
 import org.springframework.http.converter.HttpMessageConverter;
 import org.springframework.validation.MessageCodesResolver;
 import org.springframework.validation.Validator;
 import org.springframework.web.method.support.HandlerMethodArgumentResolver;
 import org.springframework.web.method.support.HandlerMethodReturnValueHandler;
 import org.springframework.web.servlet.HandlerExceptionResolver;

 public abstract class WebMvcConfigurerAdapter implements WebMvcConfigurer {
     public WebMvcConfigurerAdapter() {
     }

     public void configurePathMatch(PathMatchConfigurer configurer) {
     }

     public void configureContentNegotiation(ContentNegotiationConfigurer configurer) {
     }

     public void configureAsyncSupport(AsyncSupportConfigurer configurer) {
     }

     public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
     }

     public void addFormatters(FormatterRegistry registry) {
     }

     public void addInterceptors(InterceptorRegistry registry) {
     }

     public void addResourceHandlers(ResourceHandlerRegistry registry) {
     }

     public void addCorsMappings(CorsRegistry registry) {
     }

     public void addViewControllers(ViewControllerRegistry registry) {
     }

     public void configureViewResolvers(ViewResolverRegistry registry) {
     }

     public void addArgumentResolvers(List<HandlerMethodArgumentResolver> argumentResolvers) {
     }

     public void addReturnValueHandlers(List<HandlerMethodReturnValueHandler> returnValueHandlers) {
     }

     public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
     }

     public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
     }

     public void configureHandlerExceptionResolvers(List<HandlerExceptionResolver> exceptionResolvers) {
     }

     public void extendHandlerExceptionResolvers(List<HandlerExceptionResolver> exceptionResolvers) {
     }

     public Validator getValidator() {
         return null;
     }

     public MessageCodesResolver getMessageCodesResolver() {
         return null;
     }
 }

如上代码的实现都是空的，也就是说我们想要完成自定义一些操作，只需要重写这个类中对应的方法，就可以实现

比如昨晚写了篇自定义springboot的消息转换器，其中的一种实现就是通过重写这个类的方法

下边贴一下重写addInterceptors从而实现自定义拦截器的demo

 package com.itcast.springboot;

 import org.springframework.context.annotation.Configuration;
 import org.springframework.web.servlet.HandlerInterceptor;
 import org.springframework.web.servlet.ModelAndView;
 import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
 import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;

 /**
  * @Author : Hellxz
  * @Description:自定义拦截器
  * @Date : 2018/4/8 12:36
  */
 @Configuration
 public class MyInterceptor extends WebMvcConfigurerAdapter {
     /**
      * @Author: Hellxz
      * @Description: 添加自定义拦截器
      * @Date: 2018/4/8 12:39
      */
     @Override
     public void addInterceptors(InterceptorRegistry registry) {
         /**
          * 自定义handlerInterceptor,匿名内部类，也可以单独提出来一个类
          */
         HandlerInterceptor handlerInterceptor = new HandlerInterceptor() {
             @Override
             public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
                 System.out.println("—————进入拦截器");
                 return true;
             }

             @Override
             public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
             }

             @Override
             public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
             }
         };
         //将这个handler添加到签名认证拦截器中
         registry.addInterceptor(handlerInterceptor);
 //        添加拦截uri
 //        registry.addInterceptor(handlerInterceptor).addPathPatterns("/user/**");
         super.addInterceptors(registry);
     }

 }