Скачать или смотреть Creating a Custom Mobile Validator with Spring Boot

Learn how to build a simple yet effective `custom mobile validator` using Spring Boot. Troubleshoot issues with regex validation and ensure accurate results with our step-by-step guide.
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This video is based on the question https://stackoverflow.com/q/70361706/ asked by the user 'user17682288' ( https://stackoverflow.com/u/17682288/ ) and on the answer https://stackoverflow.com/a/70361879/ provided by the user 'Bhushan' ( https://stackoverflow.com/u/12965752/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Building a Custom Mobile Validator with Spring Boot

In the world of software development, ensuring the accuracy of user input is paramount. One common requirement is the validation of mobile numbers, especially when developing applications that need to confirm a user's identification through their contact number. In this guide, we will explore how to create a custom mobile validator using Spring Boot and troubleshoot common issues that may arise during the implementation process.

The Problem Statement

You may have encountered a situation where user inputs a mobile number, and you want to validate it using a regular expression (regex). The goal is to ensure that the mobile number adheres to a specific format, which in this case is a 10-digit number starting with digits 6-9. However, you might notice that regardless of the input, the validation status remains false, which indicates a mistake in the code logic.

The Incorrect Approach

Let’s look at the original code snippet provided by a user seeking help:

[[See Video to Reveal this Text or Code Snippet]]

Problems Identified

Incorrect Checking Logic: The statement !value.equals(match.matches()) is flawed. The matches() method returns a boolean value (true/false), while value is a string. This will return false if the comparison involves a boolean and a string.

Null Check: The logic should check whether value is not null and actually validate it against the regex pattern.

The Correct Approach

Let’s refine the solution to correctly perform the validation using regex, ensuring that your implementation is both accurate and robust. Below is the corrected version of the isValid method:

[[See Video to Reveal this Text or Code Snippet]]

Changes Made

Validation Logic: The logic now uses match.matches() to directly validate the input string without comparing it against the original value.

Utility Check: Make sure to use a utility function (like StringUtil.isNotBlank) to verify that the input is neither null nor empty.

Return Statements: Clearly defines when to return true (valid) and false (invalid) based on the regex match result.

Implementing Your Validator

With the corrected code version, you can now effectively apply this MobileValidator class within your Spring Boot application. Here’s a brief on how to accomplish this:

Create a Validation Annotation: Use your MobileValidator as a custom validation annotation.

Apply the Annotation: Utilize this custom validator on user input fields (like registration forms) to ensure mobile numbers are validated before processing further.

Test Your Validator: Always run comprehensive tests to verify that your validator behaves as expected with various inputs.

Conclusion

Creating a custom mobile validator in Spring Boot is not just about writing a regex; it involves proper logic to ascertain the validation of user inputs. By applying the provided code corrections and implementing best practices, you can enhance user experience and input accuracy in your applications. If you have any further queries or encounter issues, feel free to discuss them in the comments below!