购物车实现

购物车

//首页显示servlet

//获取所有商品信息

List<Goods>list=gService.findAll();

.//打印在浏览器上

Stringurl=response.encodeRedirectURL("/20111025/by.do");

For(Goodsentity:list){

Out.println(entity.getName()+"<ahref='"+url+"?id="+entity.getId()+"'>加入购物车 </a>");

}

//ServletBy,do

//获取传递的参数id的值

Stringrid=request.getParameter("id");

//类型转换

Integerid=Integer.parseInt(rid);

//执行查询

Goodsentity=gService.findById(id);

//session中获取carts

HttpSessionsession=request.getSession();

Cookiecookie=newCookie("JSSSIONID",session.getId());

cookie.setMaxAge(600);

cookie.setPath("/20111025");

response.addCookie(cookie);

List<Goods>carts=(List<Goods>)session.getAttribute("carts");

If(carts==null){

Carts=newArrayList<Goods>();

session.setAtrribute("carts",carts);

}

Carts.add(entity);

Stringurl=response.encodeRedirectURL("/20111025/list.do");

response.sendRedirect(url);

//list.do

List<Goods>carts=request.getSession().getAttribute("carts");

For(Goodsentity:carts){

Out.println(entity.getName());

}

以上为代码简化版