spring 登录session拦截器

import com.ibeetl.admin.core.service.CorePlatformService;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

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

@Configuration
public class WebMvcConfig implements WebMvcConfigurer {
 
    /**
     * 注册拦截器
     */
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
      //addPathPattern后跟拦截地址，excludePathPatterns后跟排除拦截地址
        registry.addInterceptor(new MyInterceptor())
                .addPathPatterns("/**")
                .excludePathPatterns("/login.do")        //登录页面
                .excludePathPatterns("/register.do")     //注册页面
                .excludePathPatterns("/register.json"); //注册方法
    }

    class MyInterceptor implements HandlerInterceptor {
        //在请求处理之前进行调用（Controller方法调用之前
        @Override
        public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
            HttpSession session = httpServletRequest.getSession();
            String user = (String) session.getAttribute("loginUser"); //获取登录的session信息
            if(user!=null){
                return true;
            }
            else{
                httpServletResponse.sendRedirect(httpServletRequest.getContextPath()+"/login.do");  //未登录自动跳转界面
                return false;
            }
        }
        //请求处理之后进行调用，但是在视图被渲染之前（Controller方法调用之后）
        @Override
        public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {

            System.out.println("postHandle被调用\n");
        }

        //在整个请求结束之后被调用，也就是在DispatcherServlet 渲染了对应的视图之后执行（主要是用于进行资源清理工作）
        @Override
        public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
            System.out.println("afterCompletion被调用\n");
        }
    }
}