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