Question

我正在尝试从jsp文件向Servlet发送参数。这是jsp文件。

BookData.jsp

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
<link href="images/First.css"  rel="stylesheet" />
</head>
<body>
<div class="header">
<select onchange="javascript:handleSelect(this)">
<option>
<%out.println(session.getAttribute("name")); %></option>
<option value="SignOut">Sign Out</option>
<option value="#" >Cart</option>

</select>
<script type="text/javascript">
function handleSelect(elm)
{
window.location = elm.value+".jsp";
}
</script>
</div>
<hr>
<% 
try{
    System.out.println("entering BookData.jsp");
        final Connection conn=ConnManager.getInstance().getConnection();

                String bid=request.getParameter("bid");//retrieving bid
                System.out.println("value of bid is "+bid);
        String q="select * from asad.book where bid=?";


         PreparedStatement pstmt=(PreparedStatement)conn.prepareStatement(q);
            pstmt.setString(1,bid);
        ResultSet rs =(ResultSet) pstmt.executeQuery(); 
        String title,url,genre,author,cost,description,seller;
        while(rs.next()){
            title=rs.getString(2);
            url=rs.getString(3);
            genre=rs.getString(4);
            author=rs.getString(5);
            cost=rs.getString(6);
            description=rs.getString(7);
            seller=rs.getString(8);
            out.println("<img src="+ url + "style"+"=width:350px;height:350px>"+"</a>");

            HttpSession sess=request.getSession();
            sess.setAttribute("bookid",bid);

          String urltoSend="/Summer/OrderDetails.java";
            %>
            <h1><%=title %></h1>
                       <span>
                           <span>Title : </span><%=title %><br>
                           <span>Genre :  </span><%=genre %><br>
                           <span>Author : </span><%=author %>

                           <br><center><a href=<%=urltoSend %> >
                           BUY NOW</a></center>
                           <span>Cost : </span><%=cost %><br>
                           <span>Seller : </span><%=seller %><br>
                           <span>Description : </span><%=description %><br>
                        </span>
                        <% 

            }
            }catch(Exception e){}

 %>
</body>
</html>

现在接收参数的是Servlet OrderDetails.java。

@WebServlet("/OrderDetails")
public class OrderDetails extends HttpServlet {
    private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#HttpServlet()
     */
    public OrderDetails() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        try{
            System.out.println("inside try of orderdetails");
        final Connection conn=(Connection) ConnManager.getInstance().getConnection();
        Statement s=(Statement) conn.createStatement();
        HttpSession session=request.getSession();
        String username=(String) session.getAttribute("name");
        String q="select * from asad.user where username=?";
         PreparedStatement pstmt=(PreparedStatement)conn.prepareStatement(q);
            pstmt.setString(1,username);
        ResultSet rs =(ResultSet) pstmt.executeQuery(); 
        int cost=Integer.parseInt(rs.getString(6));
        //String bid=request.getParameter("id");
        String bid=(String) session.getAttribute("bookid");
         String query="insert into asad.orders(bid,username,cost)"+
                    " values('"+bid+"','"+username+"','"+cost+"')";
            int x=s.executeUpdate(query);
            System.out.println("inserted into orders table");//inserted into orders table
        }catch(Exception e)
        {}
        }


    }

但我是浏览器会出现requested resource not available错误。我无法理解为什么？

servlet的doGet（）方法无法接收从jsp发送的参数

0 个答案: