拦截器

package com.comen.interceptor;

import com.comen.edata.bean.User;
import com.comen.edata.tools.JwtUtil;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

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

/**
 * EDataInterceptor 继承拦截器并实现preHandle方法
 *                  负责对token校验
 */
public class EDataInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("================>拦截器");
        String ack=request.getParameter("ack");
        String userName=request.getParameter("userName");
        if (null !=ack && !"".equals(ack) && null !=userName && !"".equals(userName)){
            User user = new User();
            user.setAck(ack);
            user.setUserName(userName);
            String token = JwtUtil.createToken(user);
            response.setHeader("token",token);
            return true;
        }else {
            String token = request.getHeader("token");
            if (null !=token){
                ack=JwtUtil.verifyToken(token);
                if (null==ack){
                    return false;
                }
                return true;
            }else {
                return false;
            }
        }
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }
}

　　配置类

package com.comen.interceptor;

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
@Configuration
public class EDataConfig implements WebMvcConfigurer {
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new EDataInterceptor())
                .addPathPatterns("/**");
    }
}

 注意注意：要在启动类同级或者下级