Springboot拦截器的使用

Springboot拦截器的使用

1. 引入springboot-starter-web

 <dependency>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-web</artifactId>
     <exclusions>
         <exclusion>
             <artifactId>org.springframework.boot</artifactId>
             <groupId>spring-boot-start-tomcat</groupId>
         </exclusion>
     </exclusions>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-undertow</artifactId>
</dependency>

2. 创建拦截器

   @Component
     
   public class LogInterceptor implements HandlerInterceptor { 
     static Logger logger = LoggerFactory.getLogger(LoggerFactory.class);
   
       @Override
       public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
           logger.info("请求的路径为: "+ request.getRequestURI() + ", 请求的参数为：" + JSON.toJSONString(request.getParameterMap()));
           return true;
       }
   }
   

3. 创建WebMvcConfigurer。

   WebMvcConfigurer配置类其实是Spring内部的一种配置方式，采用JavaBean的形式来代替传统的xml配置文件形式进行针对框架个性化定制，可以自定义一些Handler，Interceptor，ViewResolver，MessageConverter。基于java-based方式的spring mvc配置，需要创建一个配置类并实现WebMvcConfigurer 接口；

   @Configuration
   public class RequestLogConfiguration {
     
       @Autowired
       private LogInterceptor logInterceptor;
   
       @Bean
       public WebMvcConfigurer webMvcConfigurer(){
           return new WebMvcConfigurer() {
               @Override
               public void addInterceptors(InterceptorRegistry registry) {
                   registry.addInterceptor(logInterceptor).addPathPatterns("/**");
               }
           };
       }
   
   }
   

   还有第二种方式实现，直接用WebConfiguration implements WebMvcConfigurer 重写addInterceptors方法