SpringBoot基础篇(七)拦截器Interceptor使用

 

1、拦截器概念

 

【HandlerInterceptor接口与HandlerInterceptorAdapter实现类】

 

 

 

2、自定义拦截器

在springboot中如果我们想自定义一个拦截器，我们需要实现HandlerInterceptor接口，或者继承HandlerInterceptorAdapter类。

​@Component
public class MyInterceptor implements HandlerInterceptor {

    private static final Logger log = LoggerFactory.getLogger(MyInterceptor.class);

    /**
     * 进入controller层之前拦截请求
     * @param httpServletRequest
     * @param httpServletResponse
     * @param o
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {

        log.info("---------------------开始进入请求地址拦截----------------------------");
        return true;

    }

    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
        log.info("--------------处理请求完成后视图渲染之前的处理操作---------------");
    }

    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
        log.info("---------------视图渲染之后的操作-------------------------0");
    }

}
​

3、拦截器配置类

在配置拦截器配置类的配置时，我们需要继承WebMvcConfigurationSupport类;根据官方标注WebMvcConfigurerAdapter过时了，因为java8接口具有默认实现，然后想通过继承WebMvcConfigurationSupport实现。

@Configuration
public class WebAppConfig extends WebMvcConfigurationSupport{
   @Autowired
   private MyInterceptor myInterceptor; 
   
    @Override
    public void addInterceptors(InterceptorRegistry registry){
        registry.addInterceptor(myInterceptor).addPathPatterns("/**");
    }
}