<script type="text/javascript">

 function form(){
       document.forms[0].submit();
      }

  </script>

 <form method="post" action="BooksServlet?operate=shop">

加入购物车<input type="checkbox" name="shopping" value="${book.getId()}">

<input type="submit" value="立即购买" >

  </form>

<a href=""onclick="form()">我的购物车</a>

BooksServlet extends HttpServlet{

public void doGet(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {

    request.setCharacterEncoding("utf-8");
   String operate=request.getParameter("operate");
  if(operate!=null&&operate.equals("shop")){
   System.out.println(operate);
   String[] bookId= request.getParameterValues("shopping");
   List<Book> booklist=new ArrayList<Book>();
   if(bookId.length!=0&& bookId!=null){
     for(String string:bookId)
     {
      int id=Integer.valueOf(string);
      Book book=bookDao.getBookById(id);
      booklist.add(book);
     }
     request.setAttribute("booklist", booklist);
     request.getRequestDispatcher("MyJsp.jsp").forward(request, response);
   
     }

  }

}

}