Latest Tutorials| Questions and Answers|Ask Questions?|Site Map



Home Answers Viewqa JSP-Servlet Servlet - JSP
Login         

View Questions and Answers by Category

Advertisements


 
Have Programming Question? Ask it here!
 
 
 


Kiran
Servlet - JSP
3 Answer(s)      4 years and 5 months ago
Posted in : JSP-Servlet


Here is my complete code. all my code is running with out any error. the for loop in servlet is running as many times as my checkboxes were checked.
the number and price were being read correct. But my total array list is not working fine. its not returning the product when i try printing in the checkout.jsp page. i tried printing the value stored in total arraylist by using total.indexof(0) & total.indexof(1). they are not storing the product. They are returning -1 and -1. please let me know how to resolve it.

Thanks,

CARTUPDATE.JSP:
-------------------------------
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><%@page
language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<html>
<%@ page import="java.sql.*" %>
<%@ page import="java.io.*" %>
<%@page import ="java.util.ArrayList" %>
<head>
<title>cartupdate</title>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
</head>
<body>
<%@ include file="header.jsp"%>
<%@ include file="left.jsp"%>

<style>
div.form {
float: center;
width: 30%;
height:50%;
margin-right: auto;
}

</style>
<form method="post" action="updateCart">


<%
Class.forName("oracle.jdbc.driver.OracleDriver");

String serverName = "127.0.0.1";
String portNumber = "1521";
String sid = "orcl";
String url = "jdbc:oracle:thin:@" + serverName + ":" + portNumber + ":" + sid;
String username = "scott"; String password = "tiger";
Connection connection = DriverManager.getConnection(url, username, password);

Statement statement = connection.createStatement() ;
ResultSet rs;
rs = statement.executeQuery("select * from cartlist");
int i=1;
out.println("connection made");%>
<TABLE cellpadding="5" border="1">
<tr>
<td>&nbsp</td>
<td>Item</td>
<td>Price</td>
<td>Units</td>
</tr><%

while (rs.next()){


%>
<tr><td><input type="checkbox" name="box" value= "<%=i%>"/></td>
<td><input type="text" name= "name" value="<%=rs.getString(1)%>" readonly/></td>
<td><input type="text" name="price" value="<%=rs.getString(2)%>" readonly/></td>
<td><input type="text" name="number" /></td>
</tr>
<%i++;}%>


</table>
<p><input type="submit" name="direction" value="Add2Cart">
<input type="submit" name="direction" value="checkout1"><b>Click checkout once you Add2Cart</b> </p>
<p><br></p>
<p></p>
</form>

</body>

</html>

Servlet Code:
----------------------
package com.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
* Servlet implementation class updateCart
*/
public class updateCart extends HttpServlet {



private static final long serialVersionUID = 1L;

/**
* @see HttpServlet#HttpServlet()
*/
public updateCart() {
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
}

/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
HttpSession session = request.getSession();

String paynow =null;
paynow = request.getParameter("direction").toString();
if(paynow.equals("PayNow")){

RequestDispatcher rd;
rd = request.getRequestDispatcher("/thankyou.jsp");
rd.forward(request,response);

}


String edit_to_cart = null;
edit_to_cart = request.getParameter("direction").toString();




String add_to_cart = null;
String checkout = null;
ArrayList <Integer> total = new ArrayList <Integer>();

add_to_cart=request.getParameter("direction").toString();


checkout = request.getParameter("direction").toString();

//PrintWriter pw = response.getWriter();
//pw.println(add_to_cart);

if (add_to_cart.equals("Add2Cart")||edit_to_cart.equals("EditCart")){
String[] checkValues=request.getParameterValues("box");
int i=0;

for(String Value:checkValues){
int chair_num;

String number =request.getParameter("number");
chair_num = Integer.parseInt(number);
String price = request.getParameter("price");
int price_num = Integer.parseInt(price);
int p =(chair_num*price_num);
i++;
total.add(p);

}

int a1 = total.indexOf(0);
int a2 = total.indexOf(1);

session.setAttribute("c1", i);

session.setAttribute("c2", a1);
session.setAttribute("c3", a2);


RequestDispatcher rd;
rd = request.getRequestDispatcher("/cartupdate.jsp");
rd.forward(request,response);

}



if (checkout.equals("checkout1")){


session.setAttribute("efg",total);


RequestDispatcher rd;
rd = request.getRequestDispatcher("/checkout.jsp");
rd.forward(request,response);



}
}
}



Checkout.jsp:
---------------------------------
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><%@page
language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<html>
<%@page import ="java.util.ArrayList" %>
<head>
<title>checkout</title>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
</head>
<body>
<%@ include file="header.jsp"%>
<%@ include file="left.jsp"%>
<form method="post" action= "updateCart">
Checkout
<%String s2 = session.getAttribute("c1").toString();
int j = Integer.parseInt(s2);
String s4 = session.getAttribute("c2").toString();
String s5 = session.getAttribute("c3").toString();
int k = Integer.parseInt(s4);
int l = Integer.parseInt(s5);
out.println(j);
out.println(k);
out.println(l);%>
<%ArrayList<Integer> s3= new ArrayList<Integer>(); %>
<% s3 = (ArrayList)session.getAttribute("efg"); %>
<% for(int i:s3){
//int d3=Integer.parseInt(i);
out.println(i);}%>
<br>
<br>
<br>



<p><input type="submit" name="direction" value="EditCart"> <input
type="submit" name="direction" value="PayNow"></p>
</form>
</body>
</html>

Advertisement
View Answers

June 11, 2010 at 11:32 AM


Hi Friend,

We have modified your code:

1)jsp file

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><%@page
language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<html>
<%@ page import="java.sql.*" %>
<%@ page import="java.io.*" %>
<%@page import ="java.util.ArrayList" %>
<head>
<title>cartupdate</title>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
</head>
<body>


<style>
div.form {
float: center;
width: 30%;
height:50%;
margin-right: auto;
}

</style>
<form method="post" action="../ServletExample">
<%
Class.forName("com.mysql.jdbc.Driver").newInstance();
Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/register","root";, "root");
Statement statement = connection.createStatement() ;
ResultSet rs = statement.executeQuery("select * from item");
int i=1;
out.println("connection made");%>
<TABLE cellpadding="5" border="1">
<tr>
<td>&nbsp</td>
<td>Item</td>
<td>Price</td>
<td>Units</td>
</tr><%

while (rs.next()){


%>
<tr><td><input type="checkbox" name="box" value= "<%=i%>"/></td>
<td><input type="text" name= "name" value="<%=rs.getString("Item_Name")%>" readonly/></td>
<td><input type="text" name="price" value="<%=rs.getString("price")%>" readonly/></td>
<td><input type="text" name="number" /></td>
</tr>
<%i++;}%>
</table>
<p><input type="submit" name="direction" value="Add2Cart">
<input type="submit" name="direction" value="checkout1"><b>Click checkout once you Add2Cart</b> </p>
<p><br></p>
<p></p>
</form>

</body>

</html>


June 11, 2010 at 11:38 AM


continue..

2)Servlet

import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class ServletExample extends HttpServlet {
private static final long serialVersionUID = 1L;

public ServletExample() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
HttpSession session = request.getSession();
PrintWriter out=response.getWriter();
String paynow =null;
paynow = request.getParameter("direction").toString();
if(paynow.equals("PayNow")){

RequestDispatcher rd;
rd = request.getRequestDispatcher("/thankyou.jsp");
rd.forward(request,response);
}
String edit_to_cart = null;
edit_to_cart = request.getParameter("direction").toString();
String add_to_cart = null;
String checkout = null;
ArrayList <Integer> total = new ArrayList <Integer>();

add_to_cart=request.getParameter("direction").toString();


checkout = request.getParameter("direction").toString();

if (add_to_cart.equals("Add2Cart")||edit_to_cart.equals("EditCart")){
String[] checkValues=request.getParameterValues("box");
int j=0;

String price[] =request.getParameterValues("price");
int p[]=new int[price.length];
int price_num[]=new int[price.length];
if(price !=null) {
for(int i=0;i<price.length;i++) {
price_num[i]=Integer.parseInt(price[i]);
}
}
String number[] =request.getParameterValues("number");
int num[]=new int[number.length];
if(number !=null) {
for(int i=0;i<number.length;i++) {
num[i]=Integer.parseInt(number[i]);
}
}
for(int i=0;i<num.length;i++){
p[i]=num[i]*price_num[i];
total.add(p[i]);
}

int a1 = total.indexOf(0);
int a2 = total.indexOf(1);

session.setAttribute("c1", j);
session.setAttribute("c2", a1);
session.setAttribute("c3", a2);
RequestDispatcher rd;
rd = request.getRequestDispatcher("/cartupdate.jsp");
rd.forward(request,response);
}
if (checkout.equals("checkout1")){

String price[] =request.getParameterValues("price");
int p[]=new int[price.length];
int price_num[]=new int[price.length];
if(price !=null) {
for(int i=0;i<price.length;i++) {
price_num[i]=Integer.parseInt(price[i]);
}
}
String number[] =request.getParameterValues("number");
int num[]=new int[number.length];
if(number !=null) {
for(int i=0;i<number.length;i++) {
num[i]=Integer.parseInt(number[i]);
}
}
for(int i=0;i<num.length;i++){
p[i]=num[i]*price_num[i];
total.add(p[i]);
}
session.setAttribute("efg",total);


RequestDispatcher rd;
rd = request.getRequestDispatcher("/modified/action.jsp");
rd.forward(request,response);
}
}
}


June 11, 2010 at 11:39 AM


continue..

3)jsp:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<%@page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<html>
<%@page import ="java.util.*" %>
<head>
<title>checkout</title>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
</head>
<body>

<form method="post" action= "updateCart">
<table>
Checkout
<%Iterator itr;%>
<% List data= (List)session.getAttribute("efg");
for (itr=data.iterator(); itr.hasNext(); )
{
%>
<tr>
<td width="119"><%=itr.next()%></td>
</tr>
<%}%>
<p><input type="submit" name="direction" value="EditCart"> <input
type="submit" name="direction" value="PayNow"></p>
</table>
</form>
</body>
</html>

Thanks


Related Tutorials/Questions & Answers:
Servlet
Servlet  What is Servlet
Servlet
Servlet  how to navigate one servlet page to another servlet page
Advertisements
servlet
servlet  is there any way to include pdf's in servlet
servlet
servlet  How many times the servlet is accessed
servlet
servlet  what are the methods and interfaces in the servlet api ?   Servlet Tutorials
servlet
servlet  how to interact with a servlet from a swing program
servlet
servlet  what are the all necessary configuration to run a servlet
servlet
servlet  I designed 1 html form & a servlet but when I click on form I don't get output of servlet Please help
servlet
servlet  I designed 1 html form & a servlet but when I click on form I don't get output of servlet Please help
Servlet
override Service method in the servlet when you extend GenericServlet to create servlet as it is mandatory to override it. But, when you extend HttpServlet to create a servlet then you can't override service method as there is a need to override
servlet
of the Servlet API. It contains the classes necessary for a standard, protocol-independent servlet. Every servlet must implement the Servlet interface in one
servlet
servlet  can i stoar record in variable which selected from table in servlet
servlet
servlet  dear sir servlet and html not run on eclips plz help me
servlet
servlet  how to create a login form using servlet using submit,edit delete button
servlet
servlet  i want a program for counting the no of times the servlet has been invoked
Servlet
Servlet  What must be implemented by all Servlets?    The Servlet Interface must be implemented by all servlets
Servlet
Servlet  I want to know the steps to write a simple servlet program... .   Hello Friend, Follow these steps: Put servlet-api.jar inside the lib folder of apache tomcat. 1)create a servlet. import java.io.*; import
servlet
servlet  how to read a file from different folder using filereader in servlet   Hello Friend, Please visit the following link: http://www.roseindia.net/servlets/servlet-read-file.shtml Here you will get an useful
servlet
servlet  i want to use servlet application on my web page then what should i do. I have already webspace.   Hi Friend, Please visit the following link: Servlet Tutorials Thanks
Servlet
Servlet   Why is Servlet so popular?   Because servlets are platform-independent Java classes that are compiled to platform-neutral byte code that can be loaded dynamically into and run by a Java technology-enabled Web
Servlet
Servlet  Hi, Can any one please expalin me below topics SERVLET ENGINE 2.WHY SUPER.INIT(); Thanks alot in advance!! Regards: Akash
servlet
servlet  I want a fully readymade project on online voting system with code in java servlet and database backend as msaccess.can u plz send me as soon as possible
servlet
servlet  plz can anyone give me the link of javax library jar file. i badly need that. thanks in advance   Please visit the following link: Download Servlet API
servlet
servlet   Dear Deepak, is it compulsary to write the sevice() becoz i ve seen some example which does not ve sevice()..is it tue? plz replay me with thanks praveen
Servlet
the same error <web-app> <servlet> <servlet-name>InsertServlet</servlet-name> <servlet-class>InsertServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>
servlet
servlet file which prints out the user's inputs. I need to use the post method to pass the data from html to the java servlet and also use both doGet and doPost methods in the servlet. I think, but unfortunately I have a terrible teacher
servlet
servlet  hi sir,this is ashok.i installed tomcat 6.0 and jdk-150.i checked the server it's working but when execute servlet program for the .class file it shows the errors javax.servlet is not exist.what can i do,please tell me
servlet
servlet  How do we define an application level scope for servlet?   Application scope uses a single namespace, which means all your pages should be careful not to duplicate the names of application scope objects
servlet
to servlet. So, if anyone can help me so I can see how to connect the two I would
servlet
servlet   try { con=DaoPack.createConnection(); } catch(Exception e) { e.printStackTrace(); } if(request.getParameter("addproduct")!=null) { ProductBean bean=new ProductBean
servlet
servlet   try { con=DaoPack.createConnection(); } catch(Exception e) { e.printStackTrace(); } if(request.getParameter("addproduct")!=null) { ProductBean bean=new ProductBean
Advertisements
 

 

 

DMCA.com