Servlet - JSP
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> </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>
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> </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>
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> </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);
}
}
}
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
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
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servlet mapping Defined servlet mapping in web.xml ? <servlet> <servlet-name>Hello</servlet-name> <servlet-class>HelloWorld</servlet-class> </servlet> <servlet-mapping>
servlet mapping Defined servlet mapping in web.xml ? <servlet> <servlet-name>Hello</servlet-name> <servlet-class>HelloWorld</servlet-class> </servlet> <servlet-mapping>
servlet - Servlet Interview Questions
, Service method in called by the servlet container to process a request from the browser. When user calls a servlet, it's service method is executed by servlet container to process the user request. So, service method is called
, Service method in called by the servlet container to process a request from the browser. When user calls a servlet, it's service method is executed by servlet container to process the user request. So, service method is called
Java(Servlet) - Servlet Interview Questions
Java Servlet examples Java and Servlet programming examples
Java Servlet examples Java and Servlet programming examples
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