Validating jsp page

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Output: while opening display page, all the attributes are getting displayed on client (browser).When we accept user inputs in any web application, it become necessary to validate them. Phone; public class Customer Notice that we are using @Email, @Not Empty and @Date Time Format annotations that are additional to JSR-303 and provided by hibernate validator implementation. This way we can provide localized error messages to the user. Logger Factory; import org.springframework.stereotype. If we won’t do it, object binding to form data will not take place and our form validation will not work. Based on your input data, you might get different error messages too.We can validate the user input at client side using Java Script but it’s also necessary to validate them at server side to make sure we are processing valid data incase user has javascript disabled. Not Empty; import org.springframework.format.annotation. Some of the JSR-303 annotations that we are using are @Size, @Not Null etc. For more information about i18n in Spring, read Spring i18n Example. Employee class code: package com.journaldev.controllers; import That’s all for Spring MVC Form validation with different ways and using resource bundles for localized error messages.class through which we can get the errors raised by Validator implementation in the controller request handler method. @Phone annotation used is our custom implementation based on JSR-303 specs, we will look into it in next section. We have two controller classes, one for annotation based form validation and another for our custom validator. You can download the sample project from below link and play around with it to learn more. Customer; @Controller public class Customer Controller When we use annotation based form validation, we just need to make little changes in our controller handler method implementation to get it working. #the is field name, other fields are in alphabatical order, max and then min Size.customer.name=Customer should be between and characters long Not Empty.customer.email=Email is a required field Not Null.customer.age=Customer should be in years #Generic annotation class messages Email=Email address is not valid Not Null=This is a required field Not Empty=This is a required field Past=Date should be Past #Custom validation annotation Phone=Invalid format, valid formats are 1234567890, 123-456-7890 x1234 I have provided message key details in the comment itself, so I will skip them here. Read more about resource messages at Spring Localization Example.

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Because many web applications use JSP pages for the view, Struts also provides custom tag libraries which facilitate interaction with HTML forms.

We have a text field in a form that will be used to manually enter the name of a new account.

We need to validate said text field to make sure that the name of the new account does not already exist in Active Directory, in which case we'll alert the user so he/she can change the name accordingly until a new unique account name is found.

Notice that last argument takes the key name for message resources. Another important point to note is that we are adding “customer” attribute to the model, this is necessary to let Spring framework know which model object to use in the form page. Logger Factory; import org.springframework.beans.factory.annotation. Autowired; import org.springframework.beans.factory.annotation. I am using Apache Tomcat 7 and below images show some of the pages with validation error messages.

RUNTIME) public @interface Phone package com.journaldev.validator; import javax.validation. Constraint Validator Context; public class Phone Validator implements Constraint Validator package com.journaldev.validator; import org.springframework.validation. Validation Utils; import org.springframework.validation. Once this method returns, spring framework binds the Errors object to the Binding Result object that we use in our controller handler method. The handler method logic is very simple, if there are any errors we are responding with the same page or else we are redirecting user to the success page. Our application is ready to deploy and run some tests, deploy it in your favorite servlet container.

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