SpringMvc自定义拦截器（注解）

拦截器

自定义拦截器实现HandlerInterceptor接口的三个方法。

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

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        //请求来时执行
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        //响应来时执行
    }
}

springmvc配置文件

//将拦截器放入mvc容器中
    @Bean
    public MyInterceptor myInterceptor(){
        return new MyInterceptor();
    }
//添加拦截器，并配置拦截路径
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        //配置拦截器
        registry.addInterceptor(myInterceptor()).addPathPatterns("/**");
    }