mvc&EasyUI項目之購物車

前言：購物車實作方式常用的有：利用Session  、Cookie、資料庫等。本文使用Session 實作購物車功能。  利用Cookie實作購物車可參考本人以前寫的Session Cookie 實作記錄使用者上次通路時間&購物車

購物車實作

當使用者登入購買商品時，建立List集合，将商品添加到集合中，然後将使用者ID與集合儲存到Session  中。

購物車實體類（Shopping）

package com.wyy.entity;
 
public class Shopping {
 
//  購物車清單訂單項所需資料
  private int id;	
  private String name;
  private float price;
  private int num;
  private float total;
 
//  送出訂單所需資料
  private String consignee;
  private String phone;
  private String postalcode;
  private String address;
  private int sendType;
 
//  頁面的所有傳參字元串
  private String pageStr;

public int getId() {
	return id;
}

public void setId(int id) {
	this.id = id;
}

public String getName() {
	return name;
}

public void setName(String name) {
	this.name = name;
}

public float getPrice() {
	return price;
}

public void setPrice(float price) {
	this.price = price;
}

public int getNum() {
	return num;
}

public void setNum(int num) {
	this.num = num;
}

public float getTotal() {
	return total;
}

public void setTotal(float total) {
	this.total = total;
}

public String getConsignee() {
	return consignee;
}

public void setConsignee(String consignee) {
	this.consignee = consignee;
}

public String getPhone() {
	return phone;
}

public void setPhone(String phone) {
	this.phone = phone;
}

public String getPostalcode() {
	return postalcode;
}

public void setPostalcode(String postalcode) {
	this.postalcode = postalcode;
}

public String getAddress() {
	return address;
}

public void setAddress(String address) {
	this.address = address;
}

public int getSendType() {
	return sendType;
}

public void setSendType(int sendType) {
	this.sendType = sendType;
}

public String getPageStr() {
	return pageStr;
}

public void setPageStr(String pageStr) {
	this.pageStr = pageStr;
}

@Override
public String toString() {
	return "Shopping [id=" + id + ", name=" + name + ", price=" + price + ", num=" + num + ", total=" + total
			+ ", consignee=" + consignee + ", phone=" + phone + ", postalcode=" + postalcode + ", address=" + address
			+ ", sendType=" + sendType + ", pageStr=" + pageStr + "]";
}

public Shopping() {
	// TODO Auto-generated constructor stub
}

public Shopping(int id, String name, float price, int num, float total, String consignee, String phone,
		String postalcode, String address, int sendType, String pageStr) {
	super();
	this.id = id;
	this.name = name;
	this.price = price;
	this.num = num;
	this.total = total;
	this.consignee = consignee;
	this.phone = phone;
	this.postalcode = postalcode;
	this.address = address;
	this.sendType = sendType;
	this.pageStr = pageStr;
}

}
           

前端頁面

                                <a type="button" class="btn btn-danger" href="${pageContext.request.contextPath}/Shopping.action?methodName=shoppingCar&name=${b.name}&price=${b.price}&num=1&id=${b.id}" target="_blank" rel="external nofollow" >加入購物車</a>

子控制器

當第一次添加商品時，建立一個集合将商品放到集合中，當使用者再次添加時，判斷集合中是否有該商品。有則數量加一，沒有則添加到集合中

/**
	 * 添加到購物車
	 * 
	 * @param req
	 * @param resp
	 * @return
	 */
	public String shoppingCar(HttpServletRequest req, HttpServletResponse resp) {
		User u = (User) req.getSession().getAttribute("user");
		if (u == null) {
			return "login";
		}
		List<Shopping> ShoppingCar = (List<Shopping>) req.getSession().getAttribute(String.valueOf(u.getId()));
		boolean b = true;
		if (ShoppingCar != null && ShoppingCar.size() > 0) {
			for (Shopping shopping : resultCar) {
				if (shopping.getId() == s.getId()) {
					shopping.setNum(shopping.getNum() + 1);
					b = false;
				}
			}
			if (b) {
				ShoppingCar.add(s);
			}
			req.getSession().setAttribute(String.valueOf(u.getId()), ShoppingCar);
			req.setAttribute("ss", ShoppingCar);
		} else {
			List<Shopping> list = new ArrayList<Shopping>();
			list.add(s);
			req.getSession().setAttribute(String.valueOf(u.getId()), list);
			req.setAttribute("ss", list);
		}
		return "Car";
	}
           

購物車跳轉

頁面按鈕

       <a type="button" class="text-primary" href="${pageContext.request.contextPath}/Shopping.action?methodName=list" target="_blank" rel="external nofollow" >我的購物車</a>

子控制器

/**
	 * 購物車顯示
	 * @param req
	 * @param resp
	 * @return
	 */
	public String list(HttpServletRequest req, HttpServletResponse resp) {
		User u = (User) req.getSession().getAttribute("user");
		if (u == null) {
			return "login";
		}
		List<Shopping> ShoppingCar = (List<Shopping>) req.getSession().getAttribute(String.valueOf(u.getId()));
		req.setAttribute("ss", ShoppingCar);
		return "Car";

	}
           

清空購物車

//清除購物車
    function clearCar() {
        $.messager.confirm('确認', '您确認想要清空購物車嗎？', function (r) {
            if (r) {
                $.ajax({
                    url: '${pageContext.request.contextPath}/Shopping.action?methodName=clear',
                    success: function (data) {
                        location.href = '${pageContext.request.contextPath}/Shopping.action?methodName=list';
                    }
                });
            }
        })
    }
           

子控制器

/**
	 * 清空購物車
	 * @param req
	 * @param resp
	 * @return
	 */
	public String clear(HttpServletRequest req, HttpServletResponse resp) {
		User u = (User) req.getSession().getAttribute("user");
		if (u == null) {
			return "login";
		}
		req.getSession().removeAttribute(String.valueOf(u.getId()));

		return null;

	}