Скачать или смотреть How to Connect Spring Boot Backend with Frontend

Learn how to easily connect a `Spring Boot` backend with a `frontend` using best practices and essential configurations. Transition from Freemarker to more flexible design options.
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How to Connect Spring Boot Backend with Frontend: A Step-by-Step Guide

Connecting a Spring Boot backend to a frontend application can be a challenge, especially if you're transitioning from using Freemarker templates and looking for better design possibilities. If you’re comfortable with developing simple REST applications and now want to integrate them with your HTML pages, you're in the right place! In this post, we'll explore how to establish a seamless connection between your backend and frontend applications.

Understanding the Problem

When building applications using Spring Boot and a separate frontend framework (like React, Vue, or even plain HTML/CSS), you need to enable communication between the two parts. The backend needs to accept requests from the frontend, and this is where configuring Cross-Origin Resource Sharing (CORS) becomes essential. If you merely rely on basic annotations, you may miss out on more customized configurations that fit larger applications.

Solution Overview

To effectively connect your Spring Boot backend with your frontend, you'll need to set up CORS correctly. Below are the detailed steps you'll need to follow to ensure a smooth connection.

Step 1: Use @ CrossOrigin Annotation

For quick setups, you can simply use the @ CrossOrigin annotation in your controller. This allows your Spring Boot application to accept requests from specified origins. However, for better scalability and control, it’s advisable to create a dedicated configuration class.

Step 2: Create CORS Configuration

Create Configuration Package: Under src/main/java, create a new package named yourProject.configuration (replace yourProject with your actual project name) to hold your configuration classes.

Create WebConfig Class: Inside this package, create a class named WebConfig. This class will implement WebMvcConfigurer and standardize the CORS settings.

Here's a sample implementation:

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

Step 3: Define Allowed Origins and Methods

In your application.properties file, you must define which origins and methods are permitted. Below is a sample configuration:

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

Recap: Best Practices

Utilize @ CrossOrigin for quick setups, but opt for a dedicated WebConfig class for larger applications.

Clearly define allowed origins and methods in application.properties for secure communication.

Regularly review your CORS settings to ensure they meet your application's needs.

Conclusion

Connecting your Spring Boot backend with a frontend application doesn't have to be a daunting task. By following the above steps, you can establish a robust configuration that allows easy and secure communication between the two. Whether you choose to stick with simple annotations or adopt a more comprehensive approach using dedicated configuration, the key is to understand your application's requirements and choose the best route accordingly.

By effectively managing CORS, you can focus on developing a beautiful user interface with modern frontend frameworks while ensuring your backend is responding correctly to requests. Happy coding!