Spring Boot Application in Java

Spring Boot Application in Java

A **Spring Boot** application in Java is a framework used to build standalone,
production-ready Java applications quickly and easily.
It is built on top of the **Spring Framework** and reduces complex configuration work.

## Key Features of Spring Boot
* Auto Configuration
* Embedded servers like Tomcat
* Easy dependency management
* Rapid application development
* Microservices support

## Advantages
* Less boilerplate code
* Faster development
* Easy REST API creation
* Simplified deployment

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Basic Spring Boot Flow

1. Create project
2. Add dependencies
3. Create main class
4. Run application

Example of Spring Boot Main Class

```java
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class MyApplication {

public static void main(String[] args) {
SpringApplication.run(MyApplication.class, args);
}
}
```

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Important Annotations
* `@SpringBootApplication`
* `@RestController`
* `@Autowired`
* `@Service`
* `@Repository`

Example REST API

```java
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloController {

@GetMapping("/hello")
public String hello() {
return "Hello Spring Boot";
}
}
```

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When you run the application and open:

```text
http://localhost:8080/hello
```

Output:
```text
Hello Spring Boot
```

## Tools Commonly Used
* Java JDK
* Maven or Gradle
* IntelliJ IDEA / Eclipse
* MySQL
* Postman

## Official Website
[Spring Boot Documentation](https://spring.io/projects/spring-boot?utm_source=chatgpt.com)

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