Скачать или смотреть A Simple Spring Boot JAR Example

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Summary: Learn how to create a basic Spring Boot application and package it into a JAR file for deployment. Explore the steps involved in setting up a Spring Boot project and executing it as a standalone JAR file.
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Spring Boot has revolutionized the way developers build Java applications, providing a streamlined approach to creating robust, production-ready systems. One of the key benefits of Spring Boot is its ability to package applications into executable JAR (Java ARchive) files, making deployment and distribution straightforward.

Here's a simple example to demonstrate how to create a Spring Boot application and package it into a JAR file:

Step 1: Set Up Your Development Environment
Ensure you have Java and Maven installed on your system. You can download and install them from their respective official websites if you haven't already.

Step 2: Create a New Spring Boot Project
You can use Spring Initializr to bootstrap a new Spring Boot project. Alternatively, you can create a new Maven project in your preferred IDE (Integrated Development Environment) and add the necessary dependencies manually. For this example, let's use Spring Initializr.

Head to Spring Initializr and configure your project with the necessary dependencies. At a minimum, you'll need the Spring Web dependency to build a basic web application. You can also specify other dependencies based on your project requirements.

Step 3: Build and Run Your Application Locally
Once you've generated the project, import it into your IDE or navigate to the project directory in your terminal. Use Maven to build the project:

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This command compiles the code, runs the tests, and packages the application into a JAR file located in the target directory.

Next, execute the JAR file using the following command:

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Replace <your-application-name> with the name of the generated JAR file. This command starts the embedded Tomcat server and deploys your Spring Boot application.

Step 4: Access Your Application
Once the application is up and running, you can access it in your web browser by navigating to http://localhost:8080 (assuming your application runs on the default port).

Step 5: Customize Your Application (Optional)
Feel free to customize your Spring Boot application by adding additional features, endpoints, or dependencies based on your requirements. Spring Boot's auto-configuration and opinionated defaults make it easy to extend and modify your application.

Step 6: Package Your Application for Deployment
When you're ready to deploy your application to a production environment, simply package it into a JAR file using Maven:

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This creates an updated JAR file in the target directory, ready for deployment to your server environment.

That's it! You've successfully created a basic Spring Boot application and packaged it into a JAR file for deployment. Spring Boot's simplicity and convention-over-configuration approach make it an excellent choice for building modern Java applications.