Скачать или смотреть How to Run a Servlet-Filter from a Different Project Without Using Spring's @Component or @Bean

This guide explores how to integrate a servlet filter from a separate project into your Spring Boot application without relying on Spring annotations.
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This video is based on the question https://stackoverflow.com/q/74003740/ asked by the user 'Gourav Kumar' ( https://stackoverflow.com/u/19208792/ ) and on the answer https://stackoverflow.com/a/74003857/ provided by the user 'xerx593' ( https://stackoverflow.com/u/592355/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Introduction

Have you ever faced the challenge of using a servlet filter from one project in another application, especially when you want to avoid annotation dependencies like @Component or @Bean? This is a common issue when working with middleware in Java applications.

In this post, we will discuss how to apply a servlet filter designed in one project to another, avoiding significant changes to your codebase. We’ll break down the process into manageable sections, explaining how to make your middleware filter independent of Spring.

Understanding the Situation

Let's clarify the scenario:

Project A: This project contains the middleware servlet filter that you want to use.

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Project B: This is your main application where you want to include the middleware.

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The Problem

The challenge arises when you want to use the filter from Project A in Project B without attaching the filter directly to Spring using @Component. You want to keep the filter usable in non-Spring applications as well.

The Solution

Making the Filter Independent

To achieve independence from Spring while maintaining the functionality of your filter, follow these steps:

Remove the @Component Annotation: This allows your middleware class to be treated as a plain Java class rather than a Spring-managed bean.

Declare a bean in your Spring Boot application to create an instance of your filter:

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Configuration for Non-Spring Applications

To use the filter in traditional web applications (like those using servlets and JSP), you will need to register the filter in your web.xml. Here's how you can do it:

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Important Considerations

Ensure that your middleware filter does not import any Spring dependencies (import org.springframework...) to maintain its independence.

If you need to pass parameters to your filter, you can utilize <init-param> within the web.xml configuration.

Conclusion

By following the steps outlined above, you can effectively utilize a servlet filter from a different project without the constraints of Spring annotations. This setup allows you to keep your applications modular and adaptable, ready for changes in both Spring and non-Spring environments.

This approach not only simplifies your project structure but also enhances the reusability of your components across different applications.

Feel free to experiment with these methods and consider applying them to your current projects to improve functionality and maintainability.