How to implement asynchronous data querying in Spring Boot?

In Spring Boot, you can use the @Async annotation to implement asynchronous data retrieval. Here are the steps to implement it:

1. Enable asynchronous functionality.

@SpringBootApplication
@EnableAsync
public class YourApplication {

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

}

1. “use asynchronous”

@Service
public class YourService {

    @Async
    public CompletableFuture<String> fetchDataAsync() {
        // 异步查询数据的逻辑
        return CompletableFuture.completedFuture("data");
    }

}

1. Call the method for querying data asynchronously and retrieve the asynchronous results.

@Service
public class YourController {

    private final YourService yourService;

    public YourController(YourService yourService) {
        this.yourService = yourService;
    }

    @GetMapping("/data")
    public CompletableFuture<String> getData() {
        return yourService.fetchDataAsync();
    }

}

By following the steps above, you can achieve the functionality of asynchronously querying data in Spring Boot. When calling the asynchronous method, it will immediately return a CompletableFuture object, which can be used to retrieve the result of the asynchronous operation.