jsp电子商务 购物车实现之二 登录和分页篇

<div id="login">
<h2>用户登陆</h2>
<form method="post" action="LoginServlet" onsubmit="return check()">
<dl>
<dt>用户名：</dt>
<dd><input class="input-text" type="text" id="username" name="username" onblur="isUsernameNull()"/><span id="usernull"></span></dd>
<dt>密　码：</dt>
<dd><input class="input-text" type="password" id="password" name="password" onblur="isPasswordNull()"/><span  id="pwdnull"></span></dd>
<dt> </dt>
<dd class="button"><input class="input-btn" type="submit" name="submit" value="" />
<input class="input-reg" type="button" name="register"
value="" onclick="window.location='register.jsp';" /></dd>
</dl>
</form>
</div>

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String username = request.getParameter("username");
String password = request.getParameter("password");

UserinfoDao ud = new UserinfoDaoImpl();

Userinfo userinfo = ud.findByNameAndPwd(username, password);
//如果登陆成功，则去bookListServlet
if(userinfo!=null){
request.getSession().setAttribute("userinfo", userinfo);
response.sendRedirect("BooklistServlet");
}
else{
response.sendRedirect("login.jsp");
}

}

protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
String page = req.getParameter("page");
if(page==null){
page="1";//第一次传过来就是默认首页
}
int pageindex = Integer.parseInt(page);//否则，可能是第2页等
BookDao bd = new BookDaoImpl();
List<Book> books = bd.findBookByPage(pageindex, 3);//3：每页多少数据
int count = bd.count();
PageControler pc = new PageControler();
int total = pc.getTotalPages(count, 3);//总页数
//通过request设置属性,+forward转向；

req.setAttribute("pageindex", pageindex);
//		HttpSession session=req.getSession();
//		session.setAttribute("books",books); 也可以，可以直接跳转;
req.setAttribute("books",books);
req.setAttribute("total",total);

req.getRequestDispatcher("index.jsp").forward(req,resp);
}

<div id="content" class="wrap">
<div class="list bookList">
<form method="post" name="shoping" action="CartServlet" onsubmit="return checkCart();">
<table>
<tr>
<th class="checker">@</th>
<th>书名</th>
<th class="info">简介</th>
<th class="price">价格</th>
<th class="store">库存</th>
<th class="view">图片预览</th>
</tr>
<c:forEach items="${books}" var="book"><!--book.id的值可以存放value -->
<tr>
<td><input type="checkbox" name="bookId" value="${book.id}" /></td>
<td class="title">${book.bookname}</td>
<td class="info">${book.info}</td>
<td>￥${book.price}</td>
<td>${book.stock}</td>
<td class="thumb"><img src="images/book/${book.image}" /></td>
</tr>
</c:forEach>

</table>

<div class="page-spliter">
<a href="BooklistServlet?page=1">首页</a>

<c:if test="${pageindex>1}">
<a href="BooklistServlet?page=${pageindex-1}">上一页</a>
</c:if>

<c:if test="${pageindex<total}">
<a href="BooklistServlet?page=${pageindex+1}">下一页</a>
</c:if>

<a href="BooklistServlet?page=${total}">尾页</a>
</div>

<div class="button">
<input class="input-btn" type="submit"
name="submit" value="" /></div>
</form>
</div>
</div>