Form-error-page Servlet
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How To Redirect To Same Jsp Page From Servlet
community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Servlet redirect to same page with error message up vote 11 down vote favorite 11
How To Display Alert Message In Servlet
I have a question about servlet redirection to the same initial page. The following is the scenario: Suppose a user want to buy an item, so he fills in the amount and submits it. The form is submitted to a servlet and the quantity available is checked against the available in the database. So if the amount of items ordered is more than the available the servlet redirects to the servlet redirect to same page with error message same page but with a message like "item is unavailable". So my question is how to implement this case. How to redirect to the same initial page with an error message. I don't want to use ajax here. Here is how I have thought of it as : 1.)should I set a context attribute if error is generated and then check it again in initial page after re-direction and show the message that has been set. What are the best practices for this kind of events? java jsp servlets redirect scope share|improve this question edited Jun 9 '14 at 17:37 informatik01 9,28763759 asked Jan 31 '13 at 18:04 Vishal Anand 2412819 Put your mouse on top of [servlets] tag which you placed on the question until a black box shows up and then click therein the info link. This issue is covered for long by the first Hello World example. –BalusC Feb 1 '13 at 14:01 add a comment| 1 Answer 1 active oldest votes up vote 31 down vote accepted The most common and recommended scenario (for the server side validation in Java serlvets/JSP world) is setting some error message as a request attribute (in the request scope) and then outputting this message in a JSP using
Here is an example of such an entry how to redirect to same page in jsp in web.xml:
6 Tutorial, Volume IPrevious: Example: Basic Authentication with JAX-WSNext: Part VIII Java EE Supporting TechnologiesExample: Form-Based Authentication with a Servlet This example discusses how to use form-based https://docs.oracle.com/cd/E19226-01/820-7627/bncby/index.html authentication with a basic servlet. With form-based authentication, you can customize the login screen and error pages that are presented to the web client for authentication of their user name and password. When a user submits their name and password, the server determines if the user name and password are those of an authorized user and, if authorized, sends how to the requested web resource. In general, the steps are necessary for adding form-based authentication to an unsecured servlet are similar to those described in Example: Basic Authentication with a Servlet, so just follow all of the steps in Example: Basic Authentication with a Servlet, except use the deployment descriptor described in Specifying Security in the Deployment Descriptor instead and create redirect to same the login form and login error form pages as described in Creating the Login Form and the Error Page. The completed version of this example application can be found in the directory tut-install/examples/web/hello2_formauth/. Creating the Login Form and the Error Page When using form-based login mechanisms, you must specify a page that contains the form you want to use to obtain the user name and password, as well as which page to display if login authentication fails. This section discusses the login form and the error page used in this example. The section Specifying Security in the Deployment Descriptor shows how you specify these pages in the deployment descriptor. The login page can be an HTML page, a JSP page, or a servlet, and it must return an HTML page containing a form that conforms to specific naming conventions (see the Java Servlet 3.0 specification for more information on these requirements). To do this, include the elements that accept user name and password information between
tags in your login page. The content of an HTML page