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Discover the steps to effectively add CSS to your Spring Boot application, ensuring your styles are applied correctly and enhancing your web application's appearance.
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How to Properly Add CSS to Your Spring Boot Application

If you're developing a Spring Boot application, you may encounter challenges when trying to integrate CSS into your web pages, particularly if you've previously come across guides not tailored for Spring Boot. In this guide, we'll address a common issue: why your CSS might not be loading and how to solve it effectively.

The Problem

Many developers, especially those new to Spring Boot, often face issues when attempting to add CSS files. Here’s a brief overview of the problem you might be facing:

You have added a CSS file to your project.

You linked the CSS file in your HTML, but the styles are not being applied.

For instance, you may have added a CSS file named csstest.css in the src/main/resources/static/css folder and linked to it in your test.html file located in src/main/resources/templates. While the expectation is that the CSS styles would apply to your HTML content, they remain unchanged, leading to confusion and frustration.

Let’s break down the steps to ensure your CSS is correctly configured to work with your Spring Boot application.

Solution: Adding CSS in Spring Boot

To ensure that your CSS is properly loaded and applied, follow these organized steps:

1. Verify CSS File Location

Make sure that your CSS file (csstest.css) is indeed located in the correct directory:

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

The static directory is essential, as Spring Boot serves static resources from this folder by default.

2. Linking the CSS File in HTML

In your HTML file (in this case, test.html), the link to the CSS file should be correctly specified. Ensure the following structure is adopted:

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

Important Note: It's crucial to include the leading slash (/css/csstest.css) to ensure correct path resolution for your CSS file.

3. Configure Spring Security (if applicable)

If Spring Security is integrated into your application, it can prevent static resources from being accessed. To allow access to your CSS files, you need to explicitly ignore them in your security configuration.

Here’s how you can do that:

Ensure your configuration class extends WebSecurityConfigurerAdapter.

Use the @ EnableWebSecurity annotation on your configuration class.

Here’s an implementation example:

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By adding this configuration, Spring will allow access to any files under /css/**, thereby preventing your CSS from being blocked by Spring Security.

4. Testing Your Setup

After completing the above steps, restart your Spring Boot application and check if the styles are applied when you refresh your HTML page. Once you do, you should see your CSS content take effect as expected.

Conclusion

Integrating CSS into your Spring Boot application can be straightforward if you ensure that your file locations, link references, and security configurations are correct. By following the provided steps and ensuring that you have the necessary setup, you can achieve a visually appealing application with ease.

If you continue to face issues, double-check each step, and ensure that your server is correctly serving static resources. Happy coding!