如何使用 Javaee jsp servlet jpa jstl ejb 在添加产品页面上显示类别下拉列表？
How to show category dropdown on add product page in using Javaee jsp servlet jpa jstl ejb?
我一直在关注ecommerce tutorial from Netbeans . This tutorial however lacks many real world services and one of them is inserting new products so i tried to implement it on my own however i am having problem to display categories on select's options dynamically on addProduct.jsp i created. Surprisingly it shows up when i put that in index.jsp on admin folder. Also uploaded this on youtube
这是我的 AdminServlet
package controller;
import entity.Category;
import entity.Customer;
import entity.CustomerOrder;
//import entity.Product;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import javax.ejb.EJB;
import javax.servlet.ServletException;
import javax.servlet.annotation.HttpConstraint;
import javax.servlet.annotation.ServletSecurity;
import javax.servlet.annotation.ServletSecurity.TransportGuarantee;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javax.servlet.http.Part;
import session.CategoryFacade;
//import session.ProductFacade;
import session.CategoryManager;
import session.ProductManager;
import session.CustomerFacade;
import session.CustomerOrderFacade;
import session.OrderManager;
import validate.Validator;
/**
*
* @author Admin
*/
@WebServlet(name = "AdminServlet",
loadOnStartup = 2,
urlPatterns = {
"/admin/",
"/admin/viewOrders",
"/admin/viewCustomers",
"/admin/customerRecord",
//"/admin/customerOrder",
"/admin/orderRecord",
"/admin/logout",
"/admin/showCategory",
"/admin/addCategory",
"/admin/addCategory.jsp",
"/admin/addProduct",
"/admin/addProduct.jsp"
})
@ServletSecurity( @HttpConstraint(transportGuarantee = TransportGuarantee.CONFIDENTIAL, rolesAllowed = {"eshopAdmin"}) )
public class AdminServlet extends HttpServlet {
@EJB
private OrderManager orderManager;
@EJB
private ProductManager productManager;
@EJB
private CustomerFacade customerFacade;
@EJB
private CategoryFacade categoryFacade;
@EJB
private CategoryManager categoryManager;
@EJB
private CustomerOrderFacade customerOrderFacade;
private Customer customer;
private CustomerOrder order;
private List orderList = new ArrayList();
private List customerList = new ArrayList();
private Category category;
private List categoryList = new ArrayList();
/**
* Processes requests for both HTTP <code>GET</code> and <code>POST</code>
* methods.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
}
// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
/**
* Handles the HTTP <code>GET</code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//processRequest(request, response);
HttpSession session;
String userPath = request.getServletPath();
//customer list
if (userPath.equals("/admin/viewCustomers")){
customerList = customerFacade.findAll();
request.setAttribute("customerList", customerList);
}
//order list
else if (userPath.equals("/admin/viewOrders")){
orderList = customerOrderFacade.findAll();
request.setAttribute("orderList", orderList);
}
//customer records of particular customer
else if (userPath.equals("/admin/customerRecord")){
//customer id from user request url
String customerId = request.getQueryString();
//get details of customer needs casting back
customer = customerFacade.find(Integer.parseInt(customerId));
request.setAttribute("customerRecord", customer);
//get customer's order details
order = customerOrderFacade.findByCustomer(customer);
request.setAttribute("order", order);
}
else if (userPath.equals("/admin/orderRecord")){
//get customer id from order request
String orderId = request.getQueryString();
//get order details by mapping orders and customer
Map orderMap = orderManager.getOrderDetails(Integer.parseInt(orderId));
//place order details into app's scope by mapping
request.setAttribute("customer", orderMap.get("customer"));
request.setAttribute("products", orderMap.get("products"));
request.setAttribute("orderRecord", orderMap.get("orderRecord"));
request.setAttribute("orderedProducts", orderMap.get("orderedProducts"));
}
else if (userPath.equals("/admin/showCategory")){
categoryList = categoryFacade.findAll();
request.setAttribute("categoryList", categoryList);
}
else if (userPath.equals("/admin/addProduct")){
categoryList = categoryFacade.findAll();
request.setAttribute("categoryList", categoryList);
}
else if (userPath.equals("/admin/logout")){
try {
session = request.getSession();
session.invalidate();
response.sendRedirect("/e-Shop/admin/");
return;
}
catch (Exception e){
e.toString();
}
}
//forward request internally
userPath = "/admin/index.jsp";
try {
request.getRequestDispatcher(userPath).forward(request, response);
}
catch (ServletException | IOException ex){
ex.toString();
}
}
/**
* Handles the HTTP <code>POST</code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//processRequest(request, response);
request.setCharacterEncoding("UTF-8");
String userPath = request.getServletPath();
HttpSession session = request.getSession();
Validator validator = new Validator() {};
if (userPath.equals("/admin/addCategory")){
String name = request.getParameter("name");
InputStream inputStream = null; // input stream of the upload file
Part filePart = request.getPart("image");
if (filePart != null) {
// prints out some information for debugging
System.out.println(filePart.getName());
System.out.println(filePart.getSize());
System.out.println(filePart.getContentType());
// obtains input stream of the upload file
inputStream = filePart.getInputStream();
}
boolean validationErrorFlag;
validationErrorFlag = validator.validateForm(name, request);
// if validation error found, return to same
if (validationErrorFlag == true) {
request.setAttribute("validationErrorFlag", validationErrorFlag);
}
else {
request.setAttribute("name" , name);
categoryManager.addCategory(name);
// response.sendRedirect("/admin/showCategory");
//userPath = "showCategory.jsp";
// request.getRequestDispatcher(userPath).forward(request, response);
//return;
//Category category = categoryManager.addCategory(name);
}
}
else if (userPath.equals("/admin/addProduct")){
String name = request.getParameter("name");
String price = request.getParameter("price");
String description = request.getParameter("description");
String category_id = request.getParameter("category_id");
boolean validationErrorFlag;
validationErrorFlag = validator.validateForm(name, request);
// if validation error found, return to same
if (validationErrorFlag == true) {
request.setAttribute("validationErrorFlag", validationErrorFlag);
}
else {
try{
request.setAttribute("name" , name);
request.setAttribute("price" , price);
request.setAttribute("description" , description);
response.sendRedirect("/admin/showCategory");
}
catch(Exception ex){
ex.toString();
}
}
}
// use RequestDispatcher to forward request internally
String url = userPath + ".jsp";
try {
request.getRequestDispatcher(url).forward(request, response);
}
catch (ServletException | IOException ex){
ex.toString();
}
}
}
这是管理文件夹
中的index.jsp
<!-- main container starts -->
<div class="container maincontainer">
<div class="row">
<div class="col-md-9">
<h1>Admin Management</h1>
<p>Here you can manage your site.</p>
<%-- category list is requested --%>
<c:if test="${!empty categoryList}">
<h2>Category List</h2>
<table class="table">
<tr>
<th>Category Id:</th>
<th>Category Name:</th>
</tr>
<c:forEach var="category" items="${categoryList}" varStatus="iter">
<tr>
<td>${category.id}</td>
<td>${category.name}</td>
</tr>
</c:forEach>
</table>
</c:if>
<%-- customerList is requested --%>
<c:if test="${!empty customerList}">
<table class="table">
<tr>
<th colspan="5">Customers</th>
</tr>
<tr>
<td>Customer Id</td>
<td>Name</td>
<td>Email</td>
<td>Phone</td>
<td>Address</td>
</tr>
<c:forEach var="customer" items="${customerList}" varStatus="iter">
<tr onclick="document.location.href='customerRecord?${customer.id}'">
<td class="green"><a href="customerRecord?${customer.id}">${customer.id}</a></td>
<td class="green"><a href="customerRecord?${customer.id}">${customer.name}</a></td>
<td class="green"><a href="customerRecord?${customer.id}">${customer.email}</a></td>
<td class="green"><a href="customerRecord?${customer.id}">${customer.phone}</a></td>
<td class="green"><a href="customerRecord?${customer.id}">${customer.address}</a></td>
</tr>
</c:forEach>
</table>
</c:if>
<%-- orderList is requested --%>
<c:if test="${!empty orderList}">
<table class="table">
<tr class="header">
<th colspan="4">Order List</th>
</tr>
<tr class="tableHeading">
<td>Order Id:</td>
<td>Confirmation No:</td>
<td>Amount</td>
<td>Date created</td>
</tr>
<c:forEach var="order" items="${orderList}" varStatus="iter">
<tr onclick="document.location.href='orderRecord?${order.id}'">
<td class="green"><a href="orderRecord?${order.id}" >${order.id}</a></td>
<td class="green"><a href="orderRecord?${order.id}" >${order.confirmationNumber}</a></td>
<td class="green"><a href="orderRecord?${order.id}" >
<fmt:formatNumber type="currency"
currencySymbol="Rs. "
value="${order.amount}"/></a></td>
<td class="green"><a href="orderRecord?${order.id}" >
<fmt:formatDate value="${order.dateCreated}"
type="both"
dateStyle="short"
timeStyle="short"/></a></td>
</tr>
</c:forEach>
</table>
</c:if>
<%-- customerRecord is requested --%>
<c:if test="${!empty customerRecord}">
<table class="table">
<tr class="header">
<th colspan="2">Customer Details</th>
</tr>
<tr>
<td style="width: 290px"><strong>Customer id:</strong></td>
<td>${customerRecord.id}</td>
</tr>
<tr>
<td><strong>Name:</strong></td>
<td>${customerRecord.name}</td>
</tr>
<tr>
<td><strong>Email:</strong></td>
<td>${customerRecord.email}</td>
</tr>
<tr>
<td><strong>Phone:</strong></td>
<td>${customerRecord.phone}</td>
</tr>
<tr>
<td><strong>Address:</strong></td>
<td>${customerRecord.address}</td>
</tr>
<tr>
<td><strong>City / Region:</strong></td>
<td>${customerRecord.cityRegion}</td>
</tr>
<tr><td colspan="2" style="padding: 0 20px"><hr></td></tr>
<tr onclick="document.location.href='orderRecord?${order.id}'">
<td colspan="2" class="green">
<a href="orderRecord?${order.id}">
<strong>View Order Summary</strong></a>
</td>
</tr>
</table>
</c:if>
<%-- orderRecord is requested --%>
<c:if test="${!empty orderRecord}">
<table class="table">
<tr class="header">
<th colspan="3">Order Summary</th>
</tr>
<tr>
<td><strong>order id:</strong></td>
<td>${orderRecord.id}</td>
</tr>
<tr>
<td><strong>Confirmation No :</strong></td>
<td>${orderRecord.confirmationNumber}</td>
</tr>
<tr>
<td><strong>Date Processed:</strong></td>
<td>
<fmt:formatDate value="${orderRecord.dateCreated}"
type="both"
dateStyle="short"
timeStyle="short"/></td>
</tr>
<tr>
<td colspan="2">
<table class="table tablein">
<tr class="">
<td class="rigidWidth">Product</td>
<td class="rigidWidth">Quantity</td>
<td>Price</td>
</tr>
<tr><td colspan="3" ><hr></td></tr>
<c:forEach var="orderedProduct" items="${orderedProducts}" varStatus="iter">
<tr>
<td>
${products[iter.index].name}
</td>
<td>
${orderedProduct.quantity}
</td>
<td class="confirmationPriceColumn">
<fmt:formatNumber type="currency" currencySymbol="Rs. "
value="${products[iter.index].price * orderedProduct.quantity}"/>
</td>
</tr>
</c:forEach>
<tr><td colspan="3" style="padding: 0 20px"><hr></td></tr>
<tr>
<td colspan="2" id="deliverySurchargeCellLeft"><strong>Delivery Charge:</strong></td>
<td id="deliverySurchargeCellRight">
<fmt:formatNumber type="currency"
currencySymbol="Rs. "
value="${initParam.deliverySurcharge}"/></td>
</tr>
<tr>
<td colspan="2" id="totalCellLeft"><strong>Total Amount:</strong></td>
<td id="totalCellRight">
<fmt:formatNumber type="currency"
currencySymbol="Rs. "
value="${orderRecord.amount}"/></td>
</tr>
</table>
</td>
</tr>
<tr><td colspan="3" style="padding: 0 20px"><hr></td></tr>
<tr
onclick="document.location.href='customerRecord?${customer.id}'">
<td colspan="2" class="green">
<a href="customerRecord?${customer.id}" >
<strong>View Customer Details </strong></a>
</td>
</tr>
</table>
</c:if>
</div>
<div class="col-md-3">
<h1>Admin Menu</h1>
<p class ="admin"><a href="<c:url value='showCategory'/>">View Category</a></p>
<p class ="admin"><a href="<c:url value='addCategory.jsp'/>">Add Category</a></p>
<p class ="admin"><a href="<c:url value='upload.jsp'/>">Upload Category Image</a></p>
<p class ="admin"><a href="<c:url value='addProduct.jsp'/>">Add Product</a></p>
<p class ="admin"><a href="<c:url value='viewCustomers'/>">View All Customers</a></p>
<p class ="admin"><a href="<c:url value='viewOrders'/>">View All Orders</a></p>
<p class ="admin"><a href="<c:url value='logout'/>">Log Out</a></p>
</div>
</div>
</div>
<!-- main container ends here -->
<div class="pullfooter"></div>
<div class ="jumbotron">
<p>Jumbo</p>
</div>
<div class="pullfooter"></div>
这是我的 addProduct.jsp 页面，我需要在其中显示我有 <%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> 部分 header.jspf .
<script src="../js/jquery.validate.js" type="text/javascript"></script>
<script type ="text/javascript">
$(document).ready(function(){
$("#addCatForm").validate({
rules: {
name: {
required: true
}
}
});
});
</script>
<!-- main container starts -->
<div class="container maincontainer">
<div class="row">
<div class="col-md-9">
<h1>Add Product item: </h1>
<form id ="addForm" action="<c:url value=''/>" method="post">
<c:if test="${!empty validationErrorFlag}">
<c:if test="${!empty nameError}"><p>Name</p></c:if>
</c:if>
<p><strong>Product Name:</strong></p>
<input class ="form-control" type="text" name="name">
<p><strong>Product Category:</strong></p>
<select id="selectedCategory" name="category" class="form-control">
<option value=""></option>
<c:forEach var="category" items="${categoryList}" varStatus="iter">
<option value="${category.getId()}">${category.getName()}</option>
</c:forEach>
</select>
<p><strong>Product Price:</strong></p>
<input class ="form-control" type="text" name="price">
<p><strong>Product details:</strong></p>
<textarea class ="form-control" type="textarea" name="description" rows="4">
</textarea>
<br>
<p><input class ="btn-success" type="submit" value="Submit"></p>
</form>
</div>
<div class="col-md-3">
<h1>Admin Menu</h1>
<p class ="admin"><a href="<c:url value='showCategory'/>">View Category</a></p>
<p class ="admin"><a href="<c:url value='addCategory.jsp'/>">Add Category</a></p>
<p class ="admin"><a href="<c:url value='upload.jsp'/>">Upload Category Image</a></p>
<p class ="admin"><a href="<c:url value='addProduct.jsp'/>">Add Product</a></p>
<p class ="admin"><a href="<c:url value='viewCustomers'/>">View All Customers</a></p>
<p class ="admin"><a href="<c:url value='viewOrders'/>">View All Orders</a></p>
<p class ="admin"><a href="<c:url value='logout'/>">Log Out</a></p>
</div>
</div>
</div>
<!-- main container ends here -->
<div class="pullfooter"></div>
<div class ="jumbotron">
<p>Jumbo</p>
</div>
<div class="pullfooter"></div>
问题出在你的 Servlet 的这一行
else if (userPath.equals("/admin/addProduct")){
替换为
else if (userPath.indexOf("/admin/addProduct")>=0){
我做了这个工作.. 不完全知道 why/how 它工作但解决方案在这里......以防有人需要.. 有一天..
<c:forEach var="category" items="${categories}" varStatus="iter">
<option value="${category.id}">${category.name}</option>
</c:forEach>
试一试..成功了
我一直在关注ecommerce tutorial from Netbeans . This tutorial however lacks many real world services and one of them is inserting new products so i tried to implement it on my own however i am having problem to display categories on select's options dynamically on addProduct.jsp i created. Surprisingly it shows up when i put that in index.jsp on admin folder. Also uploaded this on youtube
这是我的 AdminServlet
package controller;
import entity.Category;
import entity.Customer;
import entity.CustomerOrder;
//import entity.Product;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import javax.ejb.EJB;
import javax.servlet.ServletException;
import javax.servlet.annotation.HttpConstraint;
import javax.servlet.annotation.ServletSecurity;
import javax.servlet.annotation.ServletSecurity.TransportGuarantee;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javax.servlet.http.Part;
import session.CategoryFacade;
//import session.ProductFacade;
import session.CategoryManager;
import session.ProductManager;
import session.CustomerFacade;
import session.CustomerOrderFacade;
import session.OrderManager;
import validate.Validator;
/**
*
* @author Admin
*/
@WebServlet(name = "AdminServlet",
loadOnStartup = 2,
urlPatterns = {
"/admin/",
"/admin/viewOrders",
"/admin/viewCustomers",
"/admin/customerRecord",
//"/admin/customerOrder",
"/admin/orderRecord",
"/admin/logout",
"/admin/showCategory",
"/admin/addCategory",
"/admin/addCategory.jsp",
"/admin/addProduct",
"/admin/addProduct.jsp"
})
@ServletSecurity( @HttpConstraint(transportGuarantee = TransportGuarantee.CONFIDENTIAL, rolesAllowed = {"eshopAdmin"}) )
public class AdminServlet extends HttpServlet {
@EJB
private OrderManager orderManager;
@EJB
private ProductManager productManager;
@EJB
private CustomerFacade customerFacade;
@EJB
private CategoryFacade categoryFacade;
@EJB
private CategoryManager categoryManager;
@EJB
private CustomerOrderFacade customerOrderFacade;
private Customer customer;
private CustomerOrder order;
private List orderList = new ArrayList();
private List customerList = new ArrayList();
private Category category;
private List categoryList = new ArrayList();
/**
* Processes requests for both HTTP <code>GET</code> and <code>POST</code>
* methods.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
}
// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
/**
* Handles the HTTP <code>GET</code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//processRequest(request, response);
HttpSession session;
String userPath = request.getServletPath();
//customer list
if (userPath.equals("/admin/viewCustomers")){
customerList = customerFacade.findAll();
request.setAttribute("customerList", customerList);
}
//order list
else if (userPath.equals("/admin/viewOrders")){
orderList = customerOrderFacade.findAll();
request.setAttribute("orderList", orderList);
}
//customer records of particular customer
else if (userPath.equals("/admin/customerRecord")){
//customer id from user request url
String customerId = request.getQueryString();
//get details of customer needs casting back
customer = customerFacade.find(Integer.parseInt(customerId));
request.setAttribute("customerRecord", customer);
//get customer's order details
order = customerOrderFacade.findByCustomer(customer);
request.setAttribute("order", order);
}
else if (userPath.equals("/admin/orderRecord")){
//get customer id from order request
String orderId = request.getQueryString();
//get order details by mapping orders and customer
Map orderMap = orderManager.getOrderDetails(Integer.parseInt(orderId));
//place order details into app's scope by mapping
request.setAttribute("customer", orderMap.get("customer"));
request.setAttribute("products", orderMap.get("products"));
request.setAttribute("orderRecord", orderMap.get("orderRecord"));
request.setAttribute("orderedProducts", orderMap.get("orderedProducts"));
}
else if (userPath.equals("/admin/showCategory")){
categoryList = categoryFacade.findAll();
request.setAttribute("categoryList", categoryList);
}
else if (userPath.equals("/admin/addProduct")){
categoryList = categoryFacade.findAll();
request.setAttribute("categoryList", categoryList);
}
else if (userPath.equals("/admin/logout")){
try {
session = request.getSession();
session.invalidate();
response.sendRedirect("/e-Shop/admin/");
return;
}
catch (Exception e){
e.toString();
}
}
//forward request internally
userPath = "/admin/index.jsp";
try {
request.getRequestDispatcher(userPath).forward(request, response);
}
catch (ServletException | IOException ex){
ex.toString();
}
}
/**
* Handles the HTTP <code>POST</code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//processRequest(request, response);
request.setCharacterEncoding("UTF-8");
String userPath = request.getServletPath();
HttpSession session = request.getSession();
Validator validator = new Validator() {};
if (userPath.equals("/admin/addCategory")){
String name = request.getParameter("name");
InputStream inputStream = null; // input stream of the upload file
Part filePart = request.getPart("image");
if (filePart != null) {
// prints out some information for debugging
System.out.println(filePart.getName());
System.out.println(filePart.getSize());
System.out.println(filePart.getContentType());
// obtains input stream of the upload file
inputStream = filePart.getInputStream();
}
boolean validationErrorFlag;
validationErrorFlag = validator.validateForm(name, request);
// if validation error found, return to same
if (validationErrorFlag == true) {
request.setAttribute("validationErrorFlag", validationErrorFlag);
}
else {
request.setAttribute("name" , name);
categoryManager.addCategory(name);
// response.sendRedirect("/admin/showCategory");
//userPath = "showCategory.jsp";
// request.getRequestDispatcher(userPath).forward(request, response);
//return;
//Category category = categoryManager.addCategory(name);
}
}
else if (userPath.equals("/admin/addProduct")){
String name = request.getParameter("name");
String price = request.getParameter("price");
String description = request.getParameter("description");
String category_id = request.getParameter("category_id");
boolean validationErrorFlag;
validationErrorFlag = validator.validateForm(name, request);
// if validation error found, return to same
if (validationErrorFlag == true) {
request.setAttribute("validationErrorFlag", validationErrorFlag);
}
else {
try{
request.setAttribute("name" , name);
request.setAttribute("price" , price);
request.setAttribute("description" , description);
response.sendRedirect("/admin/showCategory");
}
catch(Exception ex){
ex.toString();
}
}
}
// use RequestDispatcher to forward request internally
String url = userPath + ".jsp";
try {
request.getRequestDispatcher(url).forward(request, response);
}
catch (ServletException | IOException ex){
ex.toString();
}
}
}
这是管理文件夹
中的index.jsp<!-- main container starts -->
<div class="container maincontainer">
<div class="row">
<div class="col-md-9">
<h1>Admin Management</h1>
<p>Here you can manage your site.</p>
<%-- category list is requested --%>
<c:if test="${!empty categoryList}">
<h2>Category List</h2>
<table class="table">
<tr>
<th>Category Id:</th>
<th>Category Name:</th>
</tr>
<c:forEach var="category" items="${categoryList}" varStatus="iter">
<tr>
<td>${category.id}</td>
<td>${category.name}</td>
</tr>
</c:forEach>
</table>
</c:if>
<%-- customerList is requested --%>
<c:if test="${!empty customerList}">
<table class="table">
<tr>
<th colspan="5">Customers</th>
</tr>
<tr>
<td>Customer Id</td>
<td>Name</td>
<td>Email</td>
<td>Phone</td>
<td>Address</td>
</tr>
<c:forEach var="customer" items="${customerList}" varStatus="iter">
<tr onclick="document.location.href='customerRecord?${customer.id}'">
<td class="green"><a href="customerRecord?${customer.id}">${customer.id}</a></td>
<td class="green"><a href="customerRecord?${customer.id}">${customer.name}</a></td>
<td class="green"><a href="customerRecord?${customer.id}">${customer.email}</a></td>
<td class="green"><a href="customerRecord?${customer.id}">${customer.phone}</a></td>
<td class="green"><a href="customerRecord?${customer.id}">${customer.address}</a></td>
</tr>
</c:forEach>
</table>
</c:if>
<%-- orderList is requested --%>
<c:if test="${!empty orderList}">
<table class="table">
<tr class="header">
<th colspan="4">Order List</th>
</tr>
<tr class="tableHeading">
<td>Order Id:</td>
<td>Confirmation No:</td>
<td>Amount</td>
<td>Date created</td>
</tr>
<c:forEach var="order" items="${orderList}" varStatus="iter">
<tr onclick="document.location.href='orderRecord?${order.id}'">
<td class="green"><a href="orderRecord?${order.id}" >${order.id}</a></td>
<td class="green"><a href="orderRecord?${order.id}" >${order.confirmationNumber}</a></td>
<td class="green"><a href="orderRecord?${order.id}" >
<fmt:formatNumber type="currency"
currencySymbol="Rs. "
value="${order.amount}"/></a></td>
<td class="green"><a href="orderRecord?${order.id}" >
<fmt:formatDate value="${order.dateCreated}"
type="both"
dateStyle="short"
timeStyle="short"/></a></td>
</tr>
</c:forEach>
</table>
</c:if>
<%-- customerRecord is requested --%>
<c:if test="${!empty customerRecord}">
<table class="table">
<tr class="header">
<th colspan="2">Customer Details</th>
</tr>
<tr>
<td style="width: 290px"><strong>Customer id:</strong></td>
<td>${customerRecord.id}</td>
</tr>
<tr>
<td><strong>Name:</strong></td>
<td>${customerRecord.name}</td>
</tr>
<tr>
<td><strong>Email:</strong></td>
<td>${customerRecord.email}</td>
</tr>
<tr>
<td><strong>Phone:</strong></td>
<td>${customerRecord.phone}</td>
</tr>
<tr>
<td><strong>Address:</strong></td>
<td>${customerRecord.address}</td>
</tr>
<tr>
<td><strong>City / Region:</strong></td>
<td>${customerRecord.cityRegion}</td>
</tr>
<tr><td colspan="2" style="padding: 0 20px"><hr></td></tr>
<tr onclick="document.location.href='orderRecord?${order.id}'">
<td colspan="2" class="green">
<a href="orderRecord?${order.id}">
<strong>View Order Summary</strong></a>
</td>
</tr>
</table>
</c:if>
<%-- orderRecord is requested --%>
<c:if test="${!empty orderRecord}">
<table class="table">
<tr class="header">
<th colspan="3">Order Summary</th>
</tr>
<tr>
<td><strong>order id:</strong></td>
<td>${orderRecord.id}</td>
</tr>
<tr>
<td><strong>Confirmation No :</strong></td>
<td>${orderRecord.confirmationNumber}</td>
</tr>
<tr>
<td><strong>Date Processed:</strong></td>
<td>
<fmt:formatDate value="${orderRecord.dateCreated}"
type="both"
dateStyle="short"
timeStyle="short"/></td>
</tr>
<tr>
<td colspan="2">
<table class="table tablein">
<tr class="">
<td class="rigidWidth">Product</td>
<td class="rigidWidth">Quantity</td>
<td>Price</td>
</tr>
<tr><td colspan="3" ><hr></td></tr>
<c:forEach var="orderedProduct" items="${orderedProducts}" varStatus="iter">
<tr>
<td>
${products[iter.index].name}
</td>
<td>
${orderedProduct.quantity}
</td>
<td class="confirmationPriceColumn">
<fmt:formatNumber type="currency" currencySymbol="Rs. "
value="${products[iter.index].price * orderedProduct.quantity}"/>
</td>
</tr>
</c:forEach>
<tr><td colspan="3" style="padding: 0 20px"><hr></td></tr>
<tr>
<td colspan="2" id="deliverySurchargeCellLeft"><strong>Delivery Charge:</strong></td>
<td id="deliverySurchargeCellRight">
<fmt:formatNumber type="currency"
currencySymbol="Rs. "
value="${initParam.deliverySurcharge}"/></td>
</tr>
<tr>
<td colspan="2" id="totalCellLeft"><strong>Total Amount:</strong></td>
<td id="totalCellRight">
<fmt:formatNumber type="currency"
currencySymbol="Rs. "
value="${orderRecord.amount}"/></td>
</tr>
</table>
</td>
</tr>
<tr><td colspan="3" style="padding: 0 20px"><hr></td></tr>
<tr
onclick="document.location.href='customerRecord?${customer.id}'">
<td colspan="2" class="green">
<a href="customerRecord?${customer.id}" >
<strong>View Customer Details </strong></a>
</td>
</tr>
</table>
</c:if>
</div>
<div class="col-md-3">
<h1>Admin Menu</h1>
<p class ="admin"><a href="<c:url value='showCategory'/>">View Category</a></p>
<p class ="admin"><a href="<c:url value='addCategory.jsp'/>">Add Category</a></p>
<p class ="admin"><a href="<c:url value='upload.jsp'/>">Upload Category Image</a></p>
<p class ="admin"><a href="<c:url value='addProduct.jsp'/>">Add Product</a></p>
<p class ="admin"><a href="<c:url value='viewCustomers'/>">View All Customers</a></p>
<p class ="admin"><a href="<c:url value='viewOrders'/>">View All Orders</a></p>
<p class ="admin"><a href="<c:url value='logout'/>">Log Out</a></p>
</div>
</div>
</div>
<!-- main container ends here -->
<div class="pullfooter"></div>
<div class ="jumbotron">
<p>Jumbo</p>
</div>
<div class="pullfooter"></div>
这是我的 addProduct.jsp 页面，我需要在其中显示我有 <%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> 部分 header.jspf .
<script src="../js/jquery.validate.js" type="text/javascript"></script>
<script type ="text/javascript">
$(document).ready(function(){
$("#addCatForm").validate({
rules: {
name: {
required: true
}
}
});
});
</script>
<!-- main container starts -->
<div class="container maincontainer">
<div class="row">
<div class="col-md-9">
<h1>Add Product item: </h1>
<form id ="addForm" action="<c:url value=''/>" method="post">
<c:if test="${!empty validationErrorFlag}">
<c:if test="${!empty nameError}"><p>Name</p></c:if>
</c:if>
<p><strong>Product Name:</strong></p>
<input class ="form-control" type="text" name="name">
<p><strong>Product Category:</strong></p>
<select id="selectedCategory" name="category" class="form-control">
<option value=""></option>
<c:forEach var="category" items="${categoryList}" varStatus="iter">
<option value="${category.getId()}">${category.getName()}</option>
</c:forEach>
</select>
<p><strong>Product Price:</strong></p>
<input class ="form-control" type="text" name="price">
<p><strong>Product details:</strong></p>
<textarea class ="form-control" type="textarea" name="description" rows="4">
</textarea>
<br>
<p><input class ="btn-success" type="submit" value="Submit"></p>
</form>
</div>
<div class="col-md-3">
<h1>Admin Menu</h1>
<p class ="admin"><a href="<c:url value='showCategory'/>">View Category</a></p>
<p class ="admin"><a href="<c:url value='addCategory.jsp'/>">Add Category</a></p>
<p class ="admin"><a href="<c:url value='upload.jsp'/>">Upload Category Image</a></p>
<p class ="admin"><a href="<c:url value='addProduct.jsp'/>">Add Product</a></p>
<p class ="admin"><a href="<c:url value='viewCustomers'/>">View All Customers</a></p>
<p class ="admin"><a href="<c:url value='viewOrders'/>">View All Orders</a></p>
<p class ="admin"><a href="<c:url value='logout'/>">Log Out</a></p>
</div>
</div>
</div>
<!-- main container ends here -->
<div class="pullfooter"></div>
<div class ="jumbotron">
<p>Jumbo</p>
</div>
<div class="pullfooter"></div>
问题出在你的 Servlet 的这一行
else if (userPath.equals("/admin/addProduct")){
替换为
else if (userPath.indexOf("/admin/addProduct")>=0){
我做了这个工作.. 不完全知道 why/how 它工作但解决方案在这里......以防有人需要.. 有一天..
<c:forEach var="category" items="${categories}" varStatus="iter">
<option value="${category.id}">${category.name}</option>
</c:forEach>
试一试..成功了