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我想從我添加到名爲States的模型類的數組列表中填充選擇列表。將Servlet用作控制器我需要在表單的選擇列表中填充狀態。從Servlet填充選擇列表
這可能嗎？
下面是我有這麼遠
形式的代碼：
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ page import="java.util.ArrayList" %>
<!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>Customer Management</title>
</head>
<body>
<form action="/customerManagment" method="post">
First Name:<br>
<input type="text" name="firstName"/><br>
Last Name:<br>
<input type="text" name="lastName"/><br>
Email:<br>
<input type="text" name="email"/><br>
Phone:<br>
<input type="text" name="phone"/><br>
Phone Type:<br>
Street Address:<br>
<input type="text" name="streetAddress"/><br>
Apartment Number:<br>
<input type="text" name="apartmentNumber"/><br>
City:<br>
<input type="text" name="city"/><br>
State:<br>
<select>
<option><%
ArrayList<edu.witc.Assignment03.model.States> states = (java.util.ArrayList)request.getAttribute("states");
for (edu.witc.Assignment03.model.States state : states) {
state.getStates();
}%></option>
</select><br>
<input type="submit" value="submit">
</form>
的Servlet：
import java.util.List;
import javax.servlet.*;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
//import javax.servlet.annotation.WebServlet;
//import javax.servlet.http.HttpServlet;
//import javax.servlet.http.HttpServletRequest;
//import javax.servlet.http.HttpServletResponse;
import edu.witc.Assignment03.model.Customer;
import edu.witc.Assignment03.model.Phone;
import edu.witc.Assignment03.model.States;
/*
* Not thread-safe. For illustration purpose only
*/
@WebServlet(name = "CustomerServlet", urlPatterns = {
"/customerManagement"})
public class CustomerServlet extends HttpServlet {
private static final long serialVersionUID = -20L;
private List<edu.witc.Assignment03.model.States> states = new ArrayList<States>();
private List<edu.witc.Assignment03.model.Customer> customers = new ArrayList<Customer>();
public void init() throws ServletException {
States state = new States();
states.add(state);
}
private void addCustomer(HttpServletResponse response, HttpServletRequest request)//redirect to index
throws IOException, ServletException {
String url = "/customerManagement.jsp";
request.setAttribute("customers", customers);
request.getRequestDispatcher(url).forward(request,response);
}
private void editCustomer(HttpServletResponse response, HttpServletRequest request)//redirect to index
throws IOException, ServletException {
String url = "/customerManagement.jsp";
request.setAttribute("customers", customers);
request.getRequestDispatcher(url).forward(request,response);
}
private void sendCustomerList(HttpServletResponse response, HttpServletRequest request)//redirect to index
throws IOException, ServletException {
String url = "/index.jsp";
request.setAttribute("customers", customers);
request.getRequestDispatcher(url).forward(request,response);
}
private Customer getCustomer(int customerId) {
for (Customer customer : customers) {
if (customer.getCustomerId() == customerId) {
return customer;
}
}
return null;
}
private void sendEditCustomerForm(HttpServletRequest request,
HttpServletResponse response) throws IOException, ServletException {
String url = "/customerManagement.jsp";
request.setAttribute("customers", customers);
request.getRequestDispatcher(url).forward(request,response);
}
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
String uri = request.getRequestURI();
if (uri.endsWith("/customer")) {
sendCustomerList(response, request);
} else if (uri.endsWith("/editCustomer")) {
sendEditCustomerForm(request, response);
}
}
public void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
// update customer
int customerId = 0;
try {
customerId =
Integer.parseInt(request.getParameter("id"));
} catch (NumberFormatException e) {
}
Customer customer = getCustomer(customerId);
if (customer != null) {
customer.setFirstName(request.getParameter("firstName"));
customer.setLastName(request.getParameter("lastName"));
customer.setEmail(request.getParameter("email"));
customer.setPhone(request.getParameter("phone"));
customer.setAddress(request.getParameter("address"));
customer.setCity(request.getParameter("city"));
customer.setState(request.getParameter("states"));
customer.setZip(request.getParameter("zip"));
}
addCustomer(response, request);
}
}
型號：
package edu.witc.Assignment03.model;
import java.util.ArrayList;
import java.util.List;
public class States {
private List<String> state = new ArrayList<>();{
state.add("Alabama");
state.add("Alaska");
state.add("Arizona");
state.add("Arkansas");
state.add("California");
state.add("Colorado");
state.add("Connecticut");
state.add("Delaware");
state.add("Florida");
state.add("Georgia");
state.add("Hawaii");
state.add("Idaho");
state.add("Illinois");
state.add("Indiana");
state.add("Iowa");
state.add("Kansas");
state.add("Kentucky");
state.add("Louisiana");
state.add("Maine");
state.add("Maryland");
state.add("Massachusetts");
state.add("Michigan");
state.add("Minnesota");
state.add("Mississippi");
state.add("Missouri");
state.add("Montana");
state.add("Nebraska");
state.add("Nevada");
state.add("New Hampshire");
state.add("New Jersey");
state.add("New Mexico");
state.add("New York");
state.add("North Carolina");
state.add("North Dakota");
state.add("Ohio");
state.add("Oklahoma");
state.add("Oregon");
state.add("Pennsylvania");
state.add("Rhode Island");
state.add("South Carolina");
state.add("South Dakota");
state.add("Tennessee");
state.add("Texas");
state.add("Utah");
state.add("Vermont");
state.add("Virginia");
state.add("Washington");
state.add("West Virginia");
state.add("Wisconsin");
state.add("Wyoming");
}
public List<String> getStates(){
return this.state;
}
}
你想知道如何寫一個'for'循環？ –
不是。我試圖讓選擇列表填充在所有表單上的選項列表中。之後，我只需要選擇應該很容易的項目。 – user3457789
你有什麼錯誤？ – Rembo