java - Controller 中的commandlinerunner接口(interface)方法需要添加什么spring注释

Question

我正在尝试直接在 Spring Boot 的 Controller 类中将 commandlinerunner 接口(interface)实现为 lambda 表达式，作为其功能接口(interface)。这本来应该作为第一件事运行，但它没有。如果我创建一个单独的类并添加注释 @Component，这会很有效。

.
.
import org.springframework.boot.CommandLineRunner;

@RestController
@RequestMapping("/api/v1")
public class BookController {

@Autowired
private BookRepository bookRepository;

public BookController(BookRepository bookRepository) {
    this.bookRepository = bookRepository;
}


CommandLineRunner obj = (String... args) -> {

    Book entity1 = new Book("How to stay focused", "Miriyam Bali");
    Book entity2 = new Book("Turn the World", "Cliyo Mathew");
    Book entity3 = new Book("New Heights", "Arsana Jyesh");
    Book entity4 = new Book("Create into leaves", "Nicholas A Buzaz");

    List<Book> books = Arrays.asList(entity1, entity2, entity3, entity4);
        this.bookRepository.saveAll(books);
    };

Answer 1

你可以通过这个实现这一点。它会起作用的。

.
.
import org.springframework.boot.CommandLineRunner;

@RestController
@RequestMapping("/api/v1")
public class BookController {

@Autowired
private BookRepository bookRepository;

public BookController(BookRepository bookRepository) {
    this.bookRepository = bookRepository;
}

@Bean
public CommandLineRunner run() throws Exception {
    return args -> {
        Book entity1 = new Book("How to stay focused", "Miriyam Bali");
        Book entity2 = new Book("Turn the World", "Cliyo Mathew");
        Book entity3 = new Book("New Heights", "Arsana Jyesh");
        Book entity4 = new Book("Create into leaves", "Nicholas A Buzaz");

        List<Book> books = Arrays.asList(entity1, entity2, entity3, entity4);
        this.bookRepository.saveAll(books);
    };
}