頁面jsp ：
<%@?page?language="java"?contentType="text/html;?charset=utf-8"pageEncoding="utf-8"%>
<%@?taglib?prefix="c"?uri="
<%@?taglib?uri="
<!DOCTYPE?html?PUBLIC?"-//W3C//DTD?XHTML?1.0?Transitional//EN"?"
<html?xmlns="
<head>
<meta?.kaka.web;
import?java.io.IOException;
import?java.io.PrintWriter;
import?java.util.ArrayList;
import?java.util.List;
import?javax.servlet.ServletException;
import?javax.servlet..kaka.entity.Items;
import?com.kaka.entity.Product;
import?com.kaka.service.ProductService;
import?com.kaka.service.impl.ProductServiceImpl;
public?class?HomeCar?extends?HttpServlet?{
private?static?final?long?serialVersionUID?=?1L;
ProductService?ps?=?new?ProductServiceImpl();
@Override
protected?void?doPost(HttpServletRequest?req,?HttpServletResponse?resp)?throws?ServletException,?IOException?{
//獲取商品的id
String?proId?=?req.getParameter("proId");
resp.setContentType("text/html;charset=UTF-8");
PrintWriter?writer?=?resp.getWriter();
if(null?!=?proId?&&?!"".equals(proId)){
//返回添加購物車成功
//System.out.println("============="?+?proId);
//根據商品的id查詢商品
try?{
Integer?pId?=?Integer.parseInt(proId);
Product?product?=?ps.findProductById(pId);
if(null?!=?product){
//查詢到了商品，將商品的相關參數構建壹個購物明細放入到購物車
Items?it?=?new?Items();
it.setProId(product.getProId());
it.setProName(product.getProName());
it.setProPrice(product.getProPrice());
it.setProImg(product.getProImg());
//先判斷session範圍是否有購物車
List<Items>?shopCar?=?(List<Items>)req.getSession().getAttribute("shopCar");
if(null?==?shopCar){
//購物車
shopCar?=?new?ArrayList<Items>();
}
//將商品加入到購物車之前，判斷購物車中是否已經包含了該購物明細，如果包含了，只需要修改購買的數量
if(shopCar.contains(it)){
int?index?=?shopCar.indexOf(it);//尋找購物車中包含購物明細在購物車中位置
Items?items?=?shopCar.get(index);//獲取購物車中存在的購物明細
items.setProNum(items.getProNum()+1);
}?else?{
shopCar.add(it);
}
//將購物車放入到session訪問
req.getSession().setAttribute("shopCar",?shopCar);
//返回
writer.print(true);
}?else?{
writer.print(false);
}
}?catch?(Exception?e)?{
e.printStackTrace();
writer.print(false);
}
}?else?{
writer.print(false);
}
writer.flush();
writer.close();
}
@Override
protected?void?doGet(HttpServletRequest?req,?HttpServletResponse?resp)?throws?ServletException,?IOException?{
doPost(req,?resp);
}
}
後臺管理servlet?
package?com.kaka.web;
import?java.io.IOException;
import?java.io.PrintWriter;
import?java.util.ArrayList;
import?java.util.List;
import?javax.mail.FetchProfile.Item;
import?javax.servlet.ServletException;
import?javax.servlet..kaka.entity.Items;
import?com.kaka.entity.Product;
import?com.kaka.service.ProductService;
import?com.kaka.service.impl.ProductServiceImpl;
public?class?HomeCarManager?extends?HttpServlet?{
private?static?final?long?serialVersionUID?=?1L;
ProductService?ps?=?new?ProductServiceImpl();
@Override
protected?void?doPost(HttpServletRequest?req,?HttpServletResponse?resp)?throws?ServletException,?IOException?{
resp.setContentType("text/html;charset=UTF-8");
PrintWriter?writer?=?resp.getWriter();
//獲取參數
String?proId?=?req.getParameter("proId");
String?num?=?req.getParameter("num");
if(null?!=?proId?&&?null?!=?num
&&?!"".equals(proId)?&&?!"".equals(num)){
try?{
Integer?pId?=?Integer.parseInt(proId);
Float?pNum?=?Float.parseFloat(num);
//根據商品的id獲取對應的明細項
//?先判斷session範圍是否有購物車
List<Items>?shopCar?=?(List<Items>)?req.getSession().getAttribute("shopCar");
for(Items?it?:?shopCar){
if(it.getProId()==?pId){
it.setProNum(pNum);
}
}
writer.print(true);
}?catch?(Exception?e)?{
e.printStackTrace();
}
}?else?{
//刪除的操作
try?{
Integer?pId?=?Integer.parseInt(proId);
//根據商品的id獲取對應的明細項
//?先判斷session範圍是否有購物車
List<Items>?shopCar?=?(List<Items>)?req.getSession().getAttribute("shopCar");
Items?items?=?null;
for(Items?it?:?shopCar){
if(it.getProId()==?pId){
items?=?it;
break;
}
}
if(null?!=?items){
shopCar.remove(items);
req.getSession().setAttribute("shopCar",shopCar);
}
writer.print(true);
}?catch?(Exception?e)?{
e.printStackTrace();
}
}
writer.flush();
writer.close();
}
@Override
protected?void?doGet(HttpServletRequest?req,?HttpServletResponse?resp)?throws?ServletException,?IOException?{
doPost(req,?resp);
}
}