1、攔截器概念

2、自定義攔截器

​
public class MyInterceptor implements HandlerInterceptor {

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

    /**
     * 進入controller層之前攔截請求
     * @param httpServletRequest
     * @param httpServletResponse
     * @param o
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {

        log.info("---------------------開始進入請求地址攔截----------------------------");
        return true;

    }

    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
        log.info("--------------處理請求完成後檢視渲染之前的處理操作---------------");
    }

    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
        log.info("---------------檢視渲染之後的操作-------------------------0");
    }

}
​
 

3、攔截器配置類

@Configuration
public class WebAppConfig extends WebMvcConfigurer{
    @Override
    public void addInterceptors(InterceptorRegistry registry){
        registry.addInterceptor(new MyInterceptor()).addPathPatterns("/**");
    }
}