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" οnsubmit="return check()">
      <dl>
        <dt>用户名：</dt>
        <dd><input class="input-text" type="text" id="username" name="username" οnblur="isUsernameNull()"/><span id="usernull"></span></dd>
        <dt>密　码：</dt>
        <dd><input class="input-text" type="password" id="password" name="password" οnblur="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="" οnclick="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" οnsubmit="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>