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Springboot拦截器的使用

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>

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;
    }
}

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