How to Write and Read from application.yaml in a Spring Boot Application at Runtime скачать в хорошем качестве

How to Write and Read from application.yaml in a Spring Boot Application at Runtime

Learn how to dynamically write and read key-value pairs from an `application.yaml` file in your Spring Boot application during runtime. This guide covers step-by-step instructions with practical examples. --- This video is based on the question https://stackoverflow.com/q/65785475/ asked by the user 'Sulaiman Ahmed Z' ( https://stackoverflow.com/u/9082269/ ) and on the answer https://stackoverflow.com/a/65856302/ provided by the user 'Sulaiman Ahmed Z' ( https://stackoverflow.com/u/9082269/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions. Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: How can I write and read to and from a application.yaml at runtime using java code in a spring boot application? Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l... The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license. If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com. --- How to Write and Read from application.yaml in a Spring Boot Application at Runtime If you’ve been working with Spring Boot and YAML configurations, you might have come across the need to modify your application's configuration files on the fly. The ability to write to and read from application.yaml or application.properties at runtime can be quite beneficial, such as when you want to store user-specific settings or other dynamically generated data. In this guide, we will provide you with a clear and concise method to accomplish this using Java code within a Spring Boot application. Understanding the Challenge Many developers face the challenge of effectively managing application configurations that can change over time. The key aspects to consider include: Dynamic Key-Value Pair: You might need to allow either dynamic entries or predefined keys that require runtime modification. Accessibility: Once you've written new values in the YAML or properties file, you want to ensure those values can be accessed across your application whenever needed. Solution Overview To achieve the above goals, we will utilize Spring Boot's @ ConfigurationProperties. This powerful feature allows us to bind the properties from the configuration file to Java classes, making it easier to work with configuration values. Step 1: Add Necessary Dependencies To start, ensure you have the required dependencies in your pom.xml if you are using Maven. If you're using Gradle, you can add the equivalent dependencies. [[See Video to Reveal this Text or Code Snippet]] Step 2: Create a Configuration Class Create a configuration class to bind your properties. For example: [[See Video to Reveal this Text or Code Snippet]] In this example, properties prefixed with custom will be bound to the myValue field. Step 3: Writing to the YAML File To write new values into the application.yaml file, you can create a service that handles file writing. Here is a simplified version of how you might do that: [[See Video to Reveal this Text or Code Snippet]] Step 4: Reading from the YAML File Reading from the YAML file is straightforward, especially since it’s tied to the binding class you created earlier. You can access the value dynamically as shown below: [[See Video to Reveal this Text or Code Snippet]] Step 5: Refreshing Context (Optional) Sometimes, you'll need to refresh the application context to reflect the changes made. You can achieve this using @ RefreshScope or by leveraging Spring Cloud Config for more advanced scenarios. Conclusion In this guide, we’ve shown you how to write and read from application.yaml in a Spring Boot application at runtime using @ ConfigurationProperties. By using these steps, you can dynamically manage configuration values tailored to your application needs. If you have additional questions or need further assistance, feel free to drop your thoughts in the comments below!