Servlets :: Use Of Cookies To Store HTML Attributes Not Working?

Mar 19, 2015

I am trying to use three cookies in a servlet to store the background and foreground color and text size but my code is not working for some reason. When I run the servlet I get an IndexOutOfBounds exception and in my code is says my cookies are not ever used, when they should be to store the variables?

package httpServlets;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Date;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;

[code]....

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JavaFX 2.0 :: Store Cookies Permanently In Webview?

Sep 15, 2014

I am trying to develop a app for facebook and other social networks using webview. When the app is closed all the cookies are removed and when it is relaunched we can't get use of cookies.  I want to know how to store cookies permanently and use them when the browser is relaunched. And I also want to know how to save web history permanently.

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Servlets :: HTML Body Onload Not Working In Chrome

Mar 12, 2015

I have written sample web application with servlets and jsp. As per the below code the action url should be executed automatically according to the "onload". I have written this below code in one of my servlet, The below "onload" form hits the path in action only in Firefox and IE but not in Chrome(41.0.2272.74 beta-m (64-bit)).I have seen the link [Chrome - <body onload=“”> is not working ][1] , I have my below code in the end of servelt. there is nothing to execute after this code in the servlet.

out.write("<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
");
out.write("<html><body onload="alert('alert has been fired');document.forms[0].submit()">
");
out.write("<form method="POST" action="" + actionUrl + "">

[Code] ....

Is there any reserved key words of chrome in the above action url? If I execute this code in the html format, it is working in chrome. but if it is from servlet, alert() is not running.

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Servlets :: Disabling Cookies In Firefox Does Not Create Session

Mar 4, 2014

I'm experimenting the basic concepts of Servlet technology with my below simple setup.

I have a welcome.jsp defined under webContent in eclipse and my welcome.jsp looks like

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1" [b]session="false"[/b]%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

[Code] ....

Now I have few questions based on the above setup

1) As you see session="false" in jsp, and when I used scriptlet like <%= request.getSession(false) %>, I see "null" being printed but if I use pageContext.request.session.id, the session is not null. How does session = "false" influences scriptlets and implicit objects and why the behavior is different

2) If session really exists, even when session=false is used, when I disabled cookies in FireFox browser and click on "click Me" hyperlink, the control goes to Controller, but in the servlet, I see 'No Session Created" being displayed. Which means session was not created and probably because I used false is getSession(false). But if I enable cookies, with the same setup, I get Session ID = << some value>> being printed and this is same as the session what printed through pageContext.request.session.id in the jsp.

So when cookies disabled, how can pageContext.request.session.id actually printed session id , but not in servlet and when cookies enabled, the same session id is displayed in both cases.

My question is why there is no impact in jsp, when cookies are disabled.

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Servlets :: Setting Httponly Programmatically In Cookies Doesn't Seem To Work

Nov 5, 2014

I am using servlet 2.4 I used the ff. code below to set httponly in my application's cookies but it did not work. When I do a javascrip alert (document. cooke) in my page, the session id still shows up.

Cookie [] cookies = request.getCookies();
for(int x=0; x<cookies.length; x++){
Cookie cookie = (Cookie) cookies[x];
String cookieValue = cookie.getValue();
cookie.setValue(cookieValue + "; HttpOnly");
}

I also tried doing this and it wouldn't work too

String sessionid = request.getSession().getId();
response.setHeader("SET-COOKIE", "JSESSIONID=" + sessionid + "; HttpOnly");

by the way I am using an application server with its JAVA EE version = 1.4 and JAVA SE version = 5

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Servlets :: Difference Between Attributes And Parameters

Jul 30, 2006

What is the difference between Attributes and Parameters.that is difference between two methods request.getAttribute() and request.getParameter() and why we have this two methods?

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Servlets :: Forwarding Request Attributes From JSP

Jun 24, 2014

I am building an application that has two types of users. While some of the fields (ie: username, email address, password) are the same for both user types, other fields are different for each user type.

Therefore, I would like to split up the process of registering (ie: writing the user info to database) into two parts:

1) registering the common fields among both user types (servlet 1)
2) registering the specific fields based on the user type that is registering (servlet 2a and servlet 2b).

Therefore, once servlet 1 is processed, I wish to forward the request to servlet 2a or 2b depending on what type of user is registering.

I wish to do this since I will have other parts of my application that will make use of servlets 2a and 2b as well. Is this possible to do (redirect request parameters from jsp to servlet and then to another servlet)?

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Servlets :: Intermittent Loss Of Some Session Attributes

May 21, 2014

Session attributes after logging into web-app:

Session Attributes
thisUsersAllowedRoles=45
username=hw
authenticatedUser=org.hw.client.payroll.model.User@2c8a09da
supervisorCode=
authenticated=true

[Code] ....

Every now and then while debugging I lose session attributes:

Session Attributes
thisUsersAllowedRoles=45
username=hw
supervisorCode=
authenticated=true

[Code] ....

The authenticatedUser and menu attributes are gone. I never know when it's going to happen so I can't trace it. Any guesses why those type session objects would die?

I attached an image of what menu object looks like.

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Servlets :: Making Attributes From Textboxes And Storing Latest Passed Variable?

Mar 12, 2015

I am trying to make the variables that will be taken in from a type='text' box in HTML in NetBeans available to the other servlets as well as store and display the latest value passed into these boxes on the servlet page when the submit button is clicked or display null if the box has not yet received a value. However, I do not understand how to do this and do not understand as to why my current output is always null?

i) Is ServletContext().getAttribute("name of my textbox") really the way to pass the attributes to all servlets?

ii) Is ServletContext() passed in the service request?

iii) How to store the latest value passed into the submit box?

Here is my code

index.html
<html>
<head>
<title>Lab One</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
First Name: <input type="text" name="firstName">

[code]....

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Servlets :: Login Form - All Attributes Are Null And HTTP Status 404 Error In Some Cases

May 20, 2014

I'm a new Java user and I'm trying to code a simple login page. In first page (NewFile.jsp) users should enter their username and password and should click on "login", or click on "sign up".

1.) If user enters his username and password correctly, a login page (LoginPage.jsp) appears and says "welcome null" but it should show the name of that user instead of null.

2.) In that login page there is an edit button to edit profile information. When I clicked on it, every information is "null" and when I edit them and click on "Submit" button;

HTTP Status 404 -
type Status report
message
description The requested resource () is not available.
GlassFish Server Open Source Edition 3.1.2

that message appears.

3.) If I click on "Sign Up" button at the beginning, a registration jsp (SignUpPage.jsp) appears. After filling up text boxes and clicking on "Submit", same Status 404 screen appears.

I created a mysql database called "loginpage" using xampp. In that database there is a table called "users" and it has un, pass, name, surname, email and degree attributes.

Here is a screenshot of my project explorer:

Here is my code:

1. NewFile.jsp

<%@ page import="java.sql.*" %>
<%@ page import="java.io.*" %>
<%@ page import="java.util.*"%>
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>

[Code] .....

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Servlets :: Add RadioButton To HTML

Jun 26, 2014

My problem is my teacher told me that i have to add a radiobutton on html. According to radiobutton servlet has to choose write parameters on DB or File. And he wants me to add a method to do this work.

1)Get Parameters
2)Choose to write DB or File according to parameters
3)if it is DB create connection and do writing process
4)if it is file create file and do writing process.

Second piece of code should be removed. İnstead of this i have to use a single method. But i don't know how to do this(not writing code). Should i use another servlet or a class...

package GB;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;

[Code] ....

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Servlets :: Using HTML Form To Sort Data

May 12, 2014

I have a very simple HTML form with a textField for a name, and add button to add the name to a MySQL database, and a sort button to sort the names in the database and display them. I almost have it working, however when I hit the "sort" button; I get the message that appears after a user clicks the add button along with the sorted list of names. It looks like this:

Please go back and add a name or sort.
Bill Jones
David G
Debbie Downer
Jane Doe
Joe Smith
John Doe
Mike Jones
Paul Smith
Susan Jones

What I have to change on my code to make just the list show up by itself when the user clicks sort?

My servlet code:

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.sql.*;

[Code] .....

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Servlets :: How To Get Whole List Table / Dropdown Data From HTML / JSP

Sep 4, 2014

Is it possible to get the list/ values in html/jsp from servlet?

I have a table inside an html/jsp page and when the user clicks a button I need to refresh the whole page with some additional text message.

Currently what I am doing is that I am using a java bean for the jsp page that contains a list of values inside the table then store it in session but I think there is a better way without storing it in session.

I tried using request.getParameter() but it only returns string.

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Servlets :: How To Retrieve Grouped Items From HTML Form

Mar 5, 2015

I am having an issue with retrieving "grouped" data from HTML form to servlet. I will describe the scenario below.

In companies, they record the salary of the employees once a month.When they record it, they do not do it by visiting each an every employees personal "profile" (or whatever according to the system). Instead what they do is apply the salaries of all of them in one page.

To do the above thing they prefer excel like tabular sheets. Now, I have a html form, where the form content is a table. One row is dedicated to a one employee.

Below is my form.

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>

[Code] .....

As you can see, I have wrapped every row with a `<tbody>`. The `value` attribute of the `<tbody>` will contain the employee id. Once the form is submitted, the below servlet will capture it.

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

[Code] .....

What I was trying is get the `value` attribute of `<tbody>` (so I can identify the id of the employee) and get the data inside that `<tbody>`. However this didn't work, because I ended up with `NullpointerException` because it failed to read the `<tbody>` value.

So, how can I pass the data from table to servlet where it can clearly understand that one row is representing data belong to a one employee? If this is not the way to do it, I am also open for other methods.

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Servlets :: Loosing HTML Data Into Request Parameter?

Jan 23, 2014

In one jsp page, I submit a form with a message body with following html code (which is store in "MsgBody" in my request)

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta content="text/html; charset=utf-8" http-equiv="Content-Type" />

[code]....

But when I submit my form, I received in my servlet a parameter "MsgBody" without several tag like <html>/<body> ... do you know this behavior, by default tag are delete ?

public String execute(Map params, HttpServletRequest request, HttpServletResponse response) throws Exception {
String MsgBody = request.getParameter("MsgBody");.

I use Tomcat 7, maybe a tomcat behavior can influence for this tag loose in request param ?

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Servlets :: Save HTML Table Data To Database

Nov 17, 2014

I have a HTML table whose rows are getting generated through javascript function. I want to save this data in the table rows.

**HTML Code**

<div style="width:100%;height:100%;border:1px solid black; overflow-x:scroll; overflow-y:scroll; padding:0">
<table border=0>
<tr>
<td>
<input type="button" name="add_details" id="add_details" value="Add" onclick="AddDetails()">
<input type="button" name="delete_details" id="delete_details" value="Delete" onclick="DeleteDetails()">

[Code] .....

When i press submit button in my form of JSP, how can i access table data?

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Servlets :: Getting HTML In String When Hit JSP - Download Data In PDF File

Aug 15, 2014

I need to get the html in string when i hit the hit the jsp in servlets basically i need to put the output of jsp in pdf file when i hit one link i need to download that data in pdf file. I am using itextpdf.

Sample code

pResponse.setContentType("application/pdf");
((HttpServletResponse) pResponse).setHeader("Content-Disposition", "attachment; filename=report.pdf");

//Get the output stream for writing PDF object
OutputStream outStream=pResponse.getOutputStream();
ByteArrayOutputStream baosPDF = new ByteArrayOutputStream();

[Code] ....

I need to convert the sample download.jsp to html so that i can parse

// XMLWorkerHelper.getInstance().parseXHtml(docWriter, document,new FileInputStream(jspPath),new FileInputStream(csspath) ,null ,new XMLWorkerFontProvider());

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Servlets :: Difference Between ServletContext Parameter And Setting Attributes For ServletContext

Apr 28, 2014

Why we need to use ServletContext attribute when we already have ServletContext parameters.Whats the difference between ServletContext Attributes and ServletContext parameters.

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Servlets :: How To Store List Of Data Of A Database In ServletContext

Feb 5, 2014

i am newbie to servlet and m working on a project like online shopping. I have list of data items in my database and i am able to fetch and display the data from database but i want to know that how can i store these data items in ServletContext so that i can use use it frequently in other pages.

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Servlets :: HTML To Servlet And Come Back To Same Page With Field Values

Apr 11, 2014

i have one html page ,inside html radio button and 3 textboxes and one submit button ->action->SampleServlet.java-> from here again come back to html page with checked radio buttton value and text box value. I dont want to click back button in this case, html page to servlet->here i have to call back to my html page with checked radio button and text box value .

I tried response.redirect(original.html)-->i cant able to display checked radio button and textbox value also tried requestdispatcher forward/include,html page comes newly from starting but i dont want it,i want to view in html page with checked radio button and text box value.

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Servlets :: How To Retrieve Data From HTML Table And Insert It Into Database

Apr 1, 2015

I want to retrieve the data from this table given below and insert that data in the database in the next servlet

package com.sk;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

[Code] .....

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Servlets :: HTML Not Printing If Change Location Of Println Statement?

Mar 2, 2015

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.servlet.ServletException;

[Code] ....

When I run the above code , the html is not printed ?

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Servlets :: Checkbox Not Working Right

Jan 22, 2014

I am trying to finish this servlet that adds a new course to my courses display. im using a check box so the user can pick what the prerequisite are for the new course they want to add. so if they check cs201 , it will add cs201 as a prerequisite for that new course.

for some reason my checkbox will only add the first checkbox that is clicked. like if i add a subject , and click the check boxs for cs203 , cs202, and cs201. it will only grab cs201 and add it to my course display. it wont grab all 3. how can i grab the other info thats checked?

package cs320Homework1.servlet;
 import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
 import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;

[Code] .....

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Servlets :: Email Sending Code Is Not Working?

Mar 20, 2014

package signup;
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates

[Code].....

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Servlets :: Session-timeout Not Fully Working

May 9, 2014

in my web.xml my session time out is working but not fully working in my ui i use tiles , i have 5 clickable side panels i try to set timeout for 1 minute or 10 minutes for testing after the time is timeout this what happen working refresh the page after time out = working ,directed me into log in page which is correct.i have 5 clickable side panel in my page after timeout when i click the first 2 in side panel tabs it directed me into log in page which is also correct not working after the timeout when i navigate the page i click the other 3 side panels i can still navigate into the page but when i click the first 2 side panel it directed to log in page w/c is correct but can still navigate the page the other 3 side panels

issue : my session timeout is not fully working on my page.

<session-config>
<session-timeout>10</session-timeout>
</session-config>

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Servlets :: Shopping Cart Session Is Not Working Properly

Jan 4, 2015

I am adding my shopping cart in session like bellow in servlet

HttpSession session = request.getSession();
session.setMaxInactiveInterval(60*30); // 30 minutes
if (session.getAttribute("cart") == null){
session.setAttribute("cart", new ShoppingCart());
}
cart = session.getAttribute("cart");

I seems if more than one person accesses it from server, if they items in the shopping cart, all the product is added to a single session. I mean if i added 4 items first and other person adds 2 items, second person sees 6 products in his cart. Where am I going wrong?

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