Java Spring Boot API Development Guide

The steps to write API interfaces in Spring Boot are as follows:

1. Create a Spring Boot project: You can create a new Spring Boot project using Spring Initializr and select the necessary dependencies.
2. Create a Controller class: Create a Controller class in the project to handle API requests. You can annotate this class with @RestController to indicate that it is a RESTful API interface.

@RestController
public class ApiController {

    @GetMapping("/api/hello")
    public String hello() {
        return "Hello, World!";
    }
}

1. Define API endpoints: Define API endpoints in the Controller class using annotations like @GetMapping and @PostMapping to specify request methods and paths.
2. Run the project: Start the Spring Boot project and access the defined API endpoint path to call the corresponding interface.

These are the basic steps to create API interfaces in Spring Boot, and the design of the API interfaces can be further improved and optimized according to specific business needs.