Spring Boot拦截器（WebMvcConfigurerAdapter）

直接按我的步骤走都没有问题：

1 配置自定义的拦截器：

package com.configs;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
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;
import javax.servlet.http.HttpSession;

/**
 * Created by Yousiqi on 2017/11/16.
 */
@Component
public class UserInterceptor implements HandlerInterceptor {

    /**
     * 登录session key
     */
    public final static String SESSION_KEY = "user";

    private static final Logger logger = LoggerFactory.getLogger(UserInterceptor.class);
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        HttpSession session = request.getSession();
        if (session.getAttribute(SESSION_KEY) == null){
            // 跳转登录(这里是重定向需要包括上下文的名也就是项目名)
            String viewUrl = "/DayIndicators/loginview";
            response.sendRedirect(viewUrl);
        }


        /**
         * 对来自后台的请求统一进行日志处理
         */
        String url = request.getRequestURL().toString();
        String method = request.getMethod();
        String uri = request.getRequestURI();
        String queryString = request.getQueryString();
        System.out.println(request.getParameterMap());
        logger.info(String.format("request param: url: %s, method: %s, uri: %s, params: %s", url, method, uri, queryString));
//        return true;
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {

    }
}

2 接下来要让Spring boot知道我们配置了这一个拦截器并拦截：

package com.configs;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

/**
 *file: CustomWebMvcConfigurerAdapter.java
 * Created by jiaobuchong on 12/23/15.
 */
//利用Configuration注解来代替以往的xml配置方式
@Configuration
public class CustomWebMvcConfigurerAdapter extends WebMvcConfigurerAdapter {


    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        InterceptorRegistration addInterceptor = registry.addInterceptor(new UserInterceptor());
        // 排除配置
        //这里的路径匹配不包括上下文路径
        //不拦截错误的页面
        addInterceptor.excludePathPatterns("/error");
        //不拦截登入的页面
        addInterceptor.excludePathPatterns("/login**");

        // 拦截配置
        //这里的路径匹配不包括上下文路径
        addInterceptor.addPathPatterns("/**");
    }
}