@Action("foreaddCart")
	public String addCart() {
        
		User user =(User) ActionContext.getContext().getSession().get("user");
        boolean found = false;
 
        List<OrderItem> ois = orderItemService.list("user",user,"order", null);
        for (OrderItem oi : ois) {
            if(oi.getProduct().getId()==product.getId()){
                oi.setNumber(oi.getNumber()+num);
                orderItemService.update(oi);
                found = true;
                break;
            }
        }       
         
        if(!found){
            OrderItem oi = new OrderItem();
            oi.setUser(user);
            oi.setNumber(num);
            oi.setProduct(product);
            orderItemService.save(oi);
        }
        return "success.jsp";
    }

package com.how2java.tmall.action;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.apache.struts2.convention.annotation.Action;
import org.springframework.web.util.HtmlUtils;

import com.how2java.tmall.comparator.ProductAllComparator;
import com.how2java.tmall.comparator.ProductDateComparator;
import com.how2java.tmall.comparator.ProductPriceComparator;
import com.how2java.tmall.comparator.ProductReviewComparator;
import com.how2java.tmall.comparator.ProductSaleCountComparator;
import com.how2java.tmall.pojo.OrderItem;
import com.how2java.tmall.pojo.Product;
import com.how2java.tmall.pojo.User;
import com.how2java.tmall.service.ProductImageService;
import com.opensymphony.xwork2.ActionContext;

public class ForeAction extends Action4Result {
	@Action("foreaddCart")
	public String addCart() {
        
		User user =(User) ActionContext.getContext().getSession().get("user");
        boolean found = false;
 
        List<OrderItem> ois = orderItemService.list("user",user,"order", null);
        for (OrderItem oi : ois) {
            if(oi.getProduct().getId()==product.getId()){
                oi.setNumber(oi.getNumber()+num);
                orderItemService.update(oi);
                found = true;
                break;
            }
        }       
         
        if(!found){
            OrderItem oi = new OrderItem();
            oi.setUser(user);
            oi.setNumber(num);
            oi.setProduct(product);
            orderItemService.save(oi);
        }
        return "success.jsp";
    }   	
	
	@Action("forebuy")
	public String buy() {
	    orderItems = new ArrayList<>();
	    for (int oiid : oiids) {
	        OrderItem oi= (OrderItem) orderItemService.get(oiid);
	        total +=oi.getProduct().getPromotePrice()*oi.getNumber();
	        orderItems.add(oi);
	        productImageService.setFirstProdutImage(oi.getProduct());
	    }
	     
	    ActionContext.getContext().getSession().put("orderItems", orderItems);
	    return "buy.jsp";
	}
	
	@Action("forebuyone")
	public String buyone() {
	    User user =(User) ActionContext.getContext().getSession().get("user");
	    boolean found = false;
	    List<OrderItem> ois = orderItemService.list("user",user,"order", null);
	    for (OrderItem oi : ois) {
	        if(oi.getProduct().getId()==product.getId()){
	            oi.setNumber(oi.getNumber()+num);
	            orderItemService.update(oi);
	            found = true;
	            oiid = oi.getId();
	            break;
	        }
	    }       
	 
	    if(!found){
	        OrderItem oi = new OrderItem();
	        oi.setUser(user);
	        oi.setNumber(num);
	        oi.setProduct(product);
	        orderItemService.save(oi);
	        oiid = oi.getId();
	    }
	    return "buyPage";
	}
	
	@Action("foresearch")
	public String search(){
	    products= productService.search(keyword,0,20);
	    productService.setSaleAndReviewNumber(products);
	    for (Product product : products) 
	    	productImageService.setFirstProdutImage(product);	
		
		return "searchResult.jsp";
	}	
	@Action("forecategory")
	public String category(){
	    t2p(category);
	    productService.fill(category);
	    productService.setSaleAndReviewNumber(category.getProducts());       
	     
	    if(null!=sort){
	    switch(sort){
	        case "review":
	            Collections.sort(category.getProducts(),new ProductReviewComparator());
	            break;
	        case "date" :
	            Collections.sort(category.getProducts(),new ProductDateComparator());
	            break;
	             
	        case "saleCount" :
	            Collections.sort(category.getProducts(),new ProductSaleCountComparator());
	            break;
	             
	        case "price":
	            Collections.sort(category.getProducts(),new ProductPriceComparator());
	            break;
	             
	        case "all":
	            Collections.sort(category.getProducts(),new ProductAllComparator());
	            break;
	        }
	    }
	    return "category.jsp";  		
	}
	
	@Action("foreloginAjax")
	public String loginAjax() {
		
		user.setName(HtmlUtils.htmlEscape(user.getName()));
	    User user_session = userService.get(user.getName(),user.getPassword());
	      
	    if(null==user_session)
	        return "fail.jsp"; 
	    
	    ActionContext.getContext().getSession().put("user", user_session);
	    return "success.jsp"; 		
	}	
	
	@Action("forecheckLogin")
	public String checkLogin() {
		User u =(User) ActionContext.getContext().getSession().get("user");
		if(null==u)
			return "fail.jsp";
		else
			return "success.jsp";
	}
	
	@Action("foreproduct")
	public String product() {
		t2p(product);
	     
		productImageService.setFirstProdutImage(product);
	    productSingleImages = productImageService.list("product",product,"type", ProductImageService.type_single);
	    productDetailImages = productImageService.list("product",product,"type", ProductImageService.type_detail);
	    product.setProductSingleImages(productSingleImages);
	    product.setProductDetailImages(productDetailImages);
	     
	    propertyValues = propertyValueService.listByParent(product);       
	 
	    reviews = reviewService.listByParent(product);
	    
	    productService.setSaleAndReviewNumber(product);

	    return "product.jsp";        	
	}
	
	@Action("forelogout")
	public String logout() {
		ActionContext.getContext().getSession().remove("user");
		return "homePage"; 	
	}
	
	@Action("forelogin")
	public String login() {
		user.setName(HtmlUtils.htmlEscape(user.getName()));
	    User user_session = userService.get(user.getName(),user.getPassword());
	    if(null==user_session){
	        msg= "账号密码错误";
	        return "login.jsp"; 
	    }
	    ActionContext.getContext().getSession().put("user", user_session);
	    return "homePage"; 		
	}
	
	@Action("foreregister")
	public String register() {
		user.setName(HtmlUtils.htmlEscape(user.getName()));
		boolean exist = userService.isExist(user.getName());
      
		 if(exist){
			 msg = "用户名已经被使用,不能使用";
			 return "register.jsp";  
		 }
		 userService.save(user);
		 return "registerSuccessPage";
	}	
	@Action("forehome")
	public String home() {
		categorys = categoryService.list();
		productService.fill(categorys);
		productService.fillByRow(categorys);
		return "home.jsp";
	}
}