Springboot拦截器和过滤器

Springboot拦截器和过滤器

1.拦截器Interceptor

Spring MVC的拦截器（Interceptor）和Filter不同，但是也可以实现对请求进行预处理，后处理。

1. 实现拦截器

public class InterceptorDemo extends HandlerInterceptorAdapter {
    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
        StringBuffer requestURL = httpServletRequest.getRequestURL();
        System.out.println("前置拦截器1 preHandle： 请求的uri为："+requestURL.toString());
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
        System.out.println("拦截器1 postHandle： ");
    }

    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
        System.out.println("拦截器1 afterCompletion： ");
    }
}

2 注册拦截器

实现拦截器后还需要将拦截器注册到spring容器中，可以通过implements WebMvcConfigurer，覆盖其addInterceptors(InterceptorRegistry registry)方法。记得把Bean注册到Spring容器中，可以选择@Component 或者 @Configuration。

@Configuration
public class InterceptorConfig implements WebMvcConfigurer{

    /**
     * 注册自定义拦截器
     */
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        
       	registry.addInterceptor(new InterceptorDemo2()).addPathPatterns("/**");
        registry.addInterceptor(new InterceptorDemo()).addPathPatterns("/**");
    }
 }