SpringMvc自定義攔截器（注解）

攔截器

自定義攔截器實現HandlerInterceptor接口的三個方法。

public class MyInterceptor implements HandlerInterceptor{
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //攔截內容
        
        //放行
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        //請求來時執行
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        //響應來時執行
    }
}

springmvc配置文件

//將攔截器放入mvc容器中
    @Bean
    public MyInterceptor myInterceptor(){
        return new MyInterceptor();
    }
//添加攔截器，並配置攔截路徑
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        //配置攔截器
        registry.addInterceptor(myInterceptor()).addPathPatterns("/**");
    }