package com.qn.interceptor;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class LogHandlerInterceptor implements HandlerInterceptor {
    Logger logger = LoggerFactory.getLogger(LogHandlerInterceptor.class);
    /**
     * 请求方法执行之前
     * 返回true则通过
     *
     * @param request
     * @param response
     * @param handler
     * @return
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {
        StringBuffer requestURL = request.getRequestURL();
        logger.info("preHandle请求URL：" + requestURL.toString());
        return true;
    }

    /**
     * 返回modelAndView之前执行
     * @param request
     * @param response
     * @param handler
     * @param modelAndView
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) {
        logger.info("postHandle返回modelAndView之前");
    }

    /**
     * 执行Handler完成执行此方法
     * @param request
     * @param response
     * @param handler
     * @param ex
     */
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
        logger.info("afterCompletion执行完请求方法完全返回之后");
    }
}

package com.qn.config;

import com.qn.interceptor.LogHandlerInterceptor;
import org.springframework.boot.SpringBootConfiguration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;

@SpringBootConfiguration
public class MvcWebConfig  extends WebMvcConfigurationSupport {

    /**
     * 添加自定义拦截器
     * .addPathPatterns("/**")  拦截的请求路径
     * .excludePathPatterns("/user"); 排除的请求路径
     *
     * @param registry
     */
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new LogHandlerInterceptor())
                .addPathPatterns("/**")
                .excludePathPatterns("/user");
    }

}