SpringBoot2.x中实现自定义拦截器配置与实现

前言:

好了废话不多说，直接说说拦截器是干嘛的，拦截器是一种aop的体现，可以实现权限等功能，例如常用的认证，也就是所谓的登录。好了直接上代码吧，我这里使用的是springboot2.0.5的版本，众所周知springboot2.x多了很多新特性，刚好拦截器配置这里就做了些许改变，为了避免大家采坑，小编特意写下这篇文章。

1.x和2.x的静态资源访问区别（注意事项）

• 1.x的resources/static目录下的静态资源可以直接访问，并且访问路径上不用带static,当有配置自定义HandlerInterceptor拦截器时，请求静态资源路径不会被拦截。
• 2.x的如果自定义HandlerInterceptor拦截器时访问静态资源就会被同步拦截,这样为了实现session过期而跳转登录页面功能就会受影响.

2，自定义拦截器实现 

package com.renrengou.interceptor;

import com.renrengou.common.CookieUtils;
import com.renrengou.mange.modle.User;
import com.renrengou.service.LoginService;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

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

/**
 * @author 彭伟
 * @Date 2018/9/27 15:52
 */
public class NeedLoginInterceptor implements HandlerInterceptor {
    @Value("${mangeuser.cookiename}")
    private String MANGE_TOKEN;

    @Autowired
    private LoginService loginService;

    //方法执行前
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println(request.getContextPath());
        String token = CookieUtils.getCookieValue(request, MANGE_TOKEN, true);
        if (StringUtils.isBlank(token)) {//未登录
            response.sendRedirect(request.getContextPath() + "/index.html");
            return false;
        }
        //2,取出用户数据
        User user = (User) loginService.findUserByToken(token);
        if (user == null) {
            //登录过期
            response.sendRedirect(request.getContextPath() + "/index.html");
            return false;
        }
        //3,登录成功,重置过期时间
        loginService.resetKeyTime(token);
        return true;
    }

    //方法执行后
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) {

    }

    //页面渲染前
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {

    }
}

3，自定义拦截器配置

package com.renrengou.config;

import com.renrengou.interceptor.NeedLoginInterceptor;
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.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

/**
 * @author 彭伟
 * @Date 2018/9/27 15:56
 * mvc配置类
 */
@Configuration
public class WebMvcConfg implements WebMvcConfigurer {
    /**
     * @return 登录验证拦截器
     * 自定义登录验证拦截器
     */
    @Bean
    public NeedLoginInterceptor needLoginInterceptor() {
        return new NeedLoginInterceptor();
    }

    /**
     * @param registry 配置静态资源放行
     */
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/static/**").addResourceLocations("classpath:/static/");
    }

    /**
     * @param registry 添加拦截器
     */
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        //添加登录处理拦截器，拦截所有请求，登录请求除外
        InterceptorRegistration interceptorRegistration = registry.addInterceptor(needLoginInterceptor());
        //排除配置
        interceptorRegistration.excludePathPatterns("/sys/login.json");
        interceptorRegistration.excludePathPatterns("/charts/**");
        interceptorRegistration.excludePathPatterns("/css/**");
        interceptorRegistration.excludePathPatterns("/easyUi/**");
        interceptorRegistration.excludePathPatterns("/flashPlayer/**");
        interceptorRegistration.excludePathPatterns("/font/**");
        interceptorRegistration.excludePathPatterns("/images/**");
        interceptorRegistration.excludePathPatterns("/js/**");
        interceptorRegistration.excludePathPatterns("/pages/**");
        interceptorRegistration.excludePathPatterns("/plugin/**");
        interceptorRegistration.excludePathPatterns("/index.html");
        interceptorRegistration.excludePathPatterns("/show.html");
        //配置拦截策略
        interceptorRegistration.addPathPatterns("/**");
    }
}

4,项目目录结构

5，到此，自定义拦截器就完成了