My Small Web Project - but has some problems - please help ...

Hi ,
Can you please deploy this small project . This project has 1 jsp , 2 servlet & 3 java class .

functionality needed :
--------------------

It should display 3 combo for continent , country & city . when user select any continent & the second combo ( country )should automatically get update based on the value of first combo , after then user will select country in second combo so third combo ( city ) should autmatically get update based on the value of second combo .

please deploy it , It is not proper as per the need . And please suggest me how can I acheive this functionality ...

Thank you very much ...

home.jsp
--------
<HTML>
<HEAD><TITLE>
Home
</TITLE></HEAD>
<BODY>
<%@ page import = "java.util.*" %>
<%@ page import ="com.my.*" %>
<FORM name = "continentForm" action = "./ContinentProcessor" method = "get">
<SELECT name = "continent" onchange="continentSubmit()">
<OPTION>[Select]</OPTION>
<OPTION>Asia</OPTION>
<OPTION>Europe</OPTION>
<OPTION>North America</OPTION>
</SELECT>
</FORM>
<SCRIPT>
 
function continentSubmit() {
document.continentForm.submit();
}
</SCRIPT>
<FORM name = "countryForm" action = "./CountryProcessor" method = "get">
 
<% 
List countryList = (List) request.getAttribute("countryList");
if(countryList !=null) {
String countryName = null;
%><SELECT name = "country" onchange="countrySubmit()">
<OPTION>[Select]</OPTION>
<%
for(Iterator i = countryList.iterator(); i.hasNext() :wink:  {
countryName = ((Country)i.next()).getCountryName();
out.println(countryName);
%>
<OPTION><%= countryName%></OPTION>
<%
}
%></SELECT><%
}
%>
</FORM>
<SCRIPT>
 
function countrySubmit() {
document.countryForm.submit();
}
</SCRIPT>
 
<% 
List cityList = (List) request.getAttribute("cityList");
if(cityList !=null) {
String cityName = null;
%><SELECT>
<OPTION>[Select]</OPTION>
<%
for(Iterator i = cityList.iterator(); i.hasNext() :wink:  {
cityName = (String)i.next();
out.println(cityName);
%>
<OPTION><%= cityName%></OPTION>
<%
}
%></SELECT><%
}
%>
 
</BODY>
</HTML>

ContinentProcessor.java
-----------------------
 
package com.my;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
 
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
public class ContinentProcessor extends HttpServlet {
 
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {

String continentFromUser = req.getParameter("continent");
System.out.println(continentFromUser);
Loader loader = new Loader();
List continentList = loader.load(); 
String continentFromList = null;
List countryList = null;
for(Iterator i = continentList.iterator(); i.hasNext() :wink:  {
Continent continentObject = (Continent) i.next();
continentFromList = continentObject.getContinentName();
if(continentFromUser.equals(continentFromList)) {
countryList = continentObject.getCountryList();
break;
}
}

req.setAttribute("countryList",countryList);

RequestDispatcher dispatcher = req.getRequestDispatcher("./home.jsp");
dispatcher.forward(req, resp);

}
}

CountryProcessor.java
---------------------
 
package com.my;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
 
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class CountryProcessor extends HttpServlet {
 
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {

String countryFromUser = req.getParameter("country");
System.out.println(countryFromUser);
Loader loader = new Loader();
List continentList = loader.load(); 
List countryList = null;
List cityList = null;
String countryFromList = null;

for(Iterator i = continentList.iterator(); i.hasNext() :wink:  {
countryList = ((Continent)i.next()).getCountryList();

for(Iterator j = countryList.iterator(); j.hasNext() :wink:  {
Country countryObject = (Country)j.next();
countryFromList = countryObject.getCountryName();
if(countryFromUser.equals(countryFromList)) {
cityList = countryObject.getCityList();
break;
}

}
}
 
req.setAttribute("cityList",cityList);
 
RequestDispatcher dispatcher = req.getRequestDispatcher("./home.jsp");
dispatcher.forward(req, resp); 
 
}
 
}

Loader.java
-----------
 
/* Right now I am hardcoding the list but later I will make it from 
the XML file */
 
package com.my;
import java.util.ArrayList;
import java.util.List;
 
public class Loader {

private List continentList = null;

public List load() {
continentList = loadContinentList();
return continentList;
}

private List loadContinentList() {
List continentList = new ArrayList();
continentList.add(loadContinentObject("Asia"));
continentList.add(loadContinentObject("Europe"));
continentList.add(loadContinentObject("North America"));
return continentList;
}

private Continent loadContinentObject(String continentName) {
Continent continentObject = null;
if(continentName == "Asia") {
continentObject = new Continent(continentName,loadCountryList(continentName));
}
if(continentName == "Europe") {
continentObject = new Continent(continentName,loadCountryList(continentName));
}
if(continentName == "North America") {
continentObject = new Continent(continentName,loadCountryList(continentName));
}
return continentObject;
}

private List loadCountryList(String continentName) {
List countryList = new ArrayList();
if(continentName == "Asia") {
countryList.add(loadCountryObject("India"));
countryList.add(loadCountryObject("China"));
countryList.add(loadCountryObject("Japan"));
}
if(continentName == "Europe") {
countryList.add(loadCountryObject("United Kingdom"));
countryList.add(loadCountryObject("France"));
countryList.add(loadCountryObject("Russia"));
countryList.add(loadCountryObject("Italy"));
}
if(continentName == "North America") {
countryList.add(loadCountryObject("United States"));
countryList.add(loadCountryObject("Canada"));
}
return countryList;
}

private Country loadCountryObject(String countryName) {
Country countryObject = null;
if(countryName == "India") {
countryObject = new Country(countryName,loadCityList(countryName));
}
if(countryName == "China") {
countryObject = new Country(countryName,loadCityList(countryName));
}
if(countryName == "Japan") {
countryObject = new Country(countryName,loadCityList(countryName));
}
if(countryName == "Russia") {
countryObject = new Country(countryName,loadCityList(countryName));
}
if(countryName == "United Kingdom") {
countryObject = new Country(countryName,loadCityList(countryName));
}
if(countryName == "France") {
countryObject = new Country(countryName,loadCityList(countryName));
}
if(countryName == "Italy") {
countryObject = new Country(countryName,loadCityList(countryName));
}
if(countryName == "United States") {
countryObject = new Country(countryName,loadCityList(countryName));
}
if(countryName == "Canada") {
countryObject = new Country(countryName,loadCityList(countryName));
}
return countryObject;
}
 
private List loadCityList(String countryName) {
List cityList = new ArrayList();
if(countryName == "India") {
cityList.add("Mumbai");
cityList.add("Pune");
cityList.add("Indore");
cityList.add("Chennai");
cityList.add("Ratlam");
cityList.add("Banglore");
}
if(countryName == "China") {
cityList.add("Beijing ");
}
if(countryName == "Japan") {
cityList.add("Tokyo");
}
if(countryName == "Russia") {
cityList.add("Moscow");
}
if(countryName == "United Kingdom") {
cityList.add("London");
cityList.add("Sheffield");
}
if(countryName == "France") {
cityList.add("Paris");
}
if(countryName == "Italy") {
cityList.add("Rome");
}
if(countryName == "United States") {
cityList.add("New York");
cityList.add("Texas");
cityList.add("New Jersey");
cityList.add("California");
cityList.add("Florida");
cityList.add("Washington");
}
if(countryName == "Canada") {
cityList.add("Alberta");
cityList.add("British Columbia");
cityList.add("Nova Scotia");
}
return cityList;
}
}

rathi ,

I haven't read your complete code.

you need to modify your JSp code as below
I am doing it for country

also you need to add request attribute in your servlet, and forward them across all servlet.

in code below I assume that there is an attribte holding the value of country that is selected by user.

thanks

This is essentially the same question that you asked here. Please do not post the same question more than once.