springboot 实现拦截器

■ springboot 通过实现HandlerInterceptor接口实现拦截器；
■ 通过实现WebMvcConfigurer接口实现一个配置类，再通过@Configuration注解注入到容器；
■ 指定拦截规则；

import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 拦截器
 * @Author ds
 * @Date 2022-06-15
 */
@Component
public class ScanIntercepter implements HandlerInterceptor {

    /**
     * 预先处理,在目标的controller方法执行之前,进行处理
     * true : 通过，继续向下执行
     * false : 中止，中断后续操作
     *
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 加入逻辑，比如没有登录返回false；
        return true;
    }

    /**
     * 在目标的controller方法执行之后,到达指定页面之前进行处理
     *
     * @param request
     * @param response
     * @param handler
     * @param modelAndView
     * @throws Exception
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
    }

    /**
     * 在页面渲染之后进行处理
     *
     * @param request
     * @param response
     * @param handler
     * @param ex
     * @throws Exception
     */
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
    }
}

import cn.com.zengxin.common.intercepter.ScanIntercepter;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

/**
 * 配置类
 * @Author ds
 * @Date 2022-06-15
 */
@Configuration
public class WebConfig implements WebMvcConfigurer {

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        /**
         * 除首页和静态资源，全部拦截
         */
        registry.addInterceptor(new ScanIntercepter()).addPathPatterns("/**").excludePathPatterns(
                "/index", "/static/**"
        );
    }
}

参考：
https://blog.csdn.net/weixin_52875557/article/details/123793361