Servlet code for validating user


The Bean Validation model is supported by constraints in the form of annotations placed on a field, method, or class of a Java Beans component, such as a managed bean. User-defined constraints are called custom constraints. Several built-in constraints are available in the tag.

Any managed bean that contains Bean Validation annotations automatically gets validation constraints placed on the fields on a Java Server Faces application’s web pages.

' Throw New Security Token Exception("Unknown Username or Incorrect Password") End If End Sub End Class Note The feedback system for this content will be changing soon. If content within a comment thread is important to you, please save a copy.

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Screenshot of JSP response when wrong User name and Password are entered.

Execution of above JSP in Tomcat Copy to india folder.

' This code is for illustration purposes only and ' must not be used in a production environment because it is not secure.

A typical scenario is the user fills in fields of a form and submits it. Note that we use the - in the servlet set the value you want to transfer to the JSP page using the set Attribute() method on the request object.- in the JSP page, use the get Attribute() method on the request object to retrieve the value.

The server will process the request based on the submitted data, and send response back to the client. Servlet Exception; import javax.servlet.annotation. To transfer control from a servlet to a JSP page, use the Request Dispatcher() method.

programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other all forums Hi Nitin, If you want to suggestion for business logic then use same way as Ankit Garg says.

But make another POJO Class for your business logic.

See Validating Persistent Fields and Properties for more information on using validation constraints.

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