package com.how2java.tmall.interceptor;

import java.util.List;

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

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import com.how2java.tmall.pojo.Category;
import com.how2java.tmall.pojo.OrderItem;
import com.how2java.tmall.pojo.User;
import com.how2java.tmall.service.CategoryService;
import com.how2java.tmall.service.OrderItemService;

public class OtherInterceptor implements HandlerInterceptor {
	@Autowired CategoryService categoryService;
	@Autowired OrderItemService orderItemService;
    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
        return true;   
    }
    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
    	HttpSession session = httpServletRequest.getSession();
        User user =(User) session.getAttribute("user");
        int  cartTotalItemNumber = 0;
        if(null!=user) {
            List<OrderItem> ois = orderItemService.listByUser(user);
            for (OrderItem oi : ois) {
            	cartTotalItemNumber+=oi.getNumber();
            }
       	
        }
        
    	List<Category> cs =categoryService.list();
    	String contextPath=httpServletRequest.getServletContext().getContextPath();

    	httpServletRequest.getServletContext().setAttribute("categories_below_search", cs);
        session.setAttribute("cartTotalItemNumber", cartTotalItemNumber);
    	httpServletRequest.getServletContext().setAttribute("contextPath", contextPath);
    }

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

package com.how2java.tmall.config;

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

import com.how2java.tmall.interceptor.LoginInterceptor;
import com.how2java.tmall.interceptor.OtherInterceptor;

@Configuration
class WebMvcConfigurer extends WebMvcConfigurerAdapter{

	@Bean
	public OtherInterceptor getOtherIntercepter() {
		return new OtherInterceptor();
	}
	@Bean
	public LoginInterceptor getLoginIntercepter() {
		return new LoginInterceptor();
	}

	@Override
	public void addInterceptors(InterceptorRegistry registry){
		registry.addInterceptor(getOtherIntercepter())
				.addPathPatterns("/**");
		registry.addInterceptor(getLoginIntercepter())
				.addPathPatterns("/**");
	}
}