使用springboot编写图书管理系统代码

好的，这里提供一个简单的Spring Boot图书管理系统的代码示例，仅供参考：

首先，定义实体类Book：

@Entity
@Table(name = "book")
public class Book {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    @NotBlank
    private String title;

    @NotBlank
    private String author;

    @NotNull
    private Integer year;

    @NotNull
    private Integer total;

    @NotNull
    private Integer borrowed;

    // 省略getter和setter方法
}

然后，定义数据访问层接口BookRepository：

@Repository
public interface BookRepository extends JpaRepository<Book, Long> {
    List<Book> findByTitleContaining(String title);
}

接着，定义业务逻辑层接口BookService：

public interface BookService {
    List<Book> getAllBooks();
    Book getBookById(Long id);
    Book addBook(Book book);
    Book updateBook(Long id, Book book);
    void deleteBook(Long id);
    List<Book> searchBooks(String title);
}

实现业务逻辑层BookServiceImpl：

@Service
public class BookServiceImpl implements BookService {
    @Autowired
    private BookRepository bookRepository;

    @Override
    public List<Book> getAllBooks() {
        return bookRepository.findAll();
    }

    @Override
    public Book getBookById(Long id) {
        return bookRepository.findById(id).orElseThrow(() -> new NotFoundException("Book not found"));
    }

    @Override
    public Book addBook(Book book) {
        book.setId(null);
        return bookRepository.save(book);
    }

    @Override
    public Book updateBook(Long id, Book book) {
        Book oldBook = getBookById(id);
        oldBook.setTitle(book.getTitle());
        oldBook.setAuthor(book.getAuthor());
        oldBook.setYear(book.getYear());
        oldBook.setTotal(book.getTotal());
        oldBook.setBorrowed(book.getBorrowed());
        return bookRepository.save(oldBook);
    }

    @Override
    public void deleteBook(Long id) {
        Book book = getBookById(id);
        bookRepository.delete(book);
    }

    @Override
    public List<Book> searchBooks(String title) {
        return bookRepository.findByTitleContaining(title);
    }
}

最后，定义控制器BookController：

@RestController
@RequestMapping("/books")
public class BookController {
    @Autowired
    private BookService bookService;

    @GetMapping
    public ResponseEntity<List<Book>> getAllBooks() {
        List<Book> books = bookService.getAllBooks();
        return ResponseEntity.ok(books);
    }

    @GetMapping("/{id}")
    public ResponseEntity<Book> getBookById(@PathVariable Long id) {
        Book book = bookService.getBookById(id);
        return ResponseEntity.ok(book);
    }

    @PostMapping
    public ResponseEntity<Book> addBook(@RequestBody Book book) {
        Book newBook = bookService.addBook(book);
        return ResponseEntity.ok(newBook);
    }

    @PutMapping("/{id}")
    public ResponseEntity<Book> updateBook(@PathVariable Long id, @RequestBody Book book) {
        Book updatedBook = bookService.updateBook(id, book);
        return ResponseEntity.ok(updatedBook);
    }

    @DeleteMapping("/{id}")
    public ResponseEntity<Void> deleteBook(@PathVariable Long id) {
        bookService.deleteBook(id);
        return ResponseEntity.noContent().build();
    }

    @GetMapping("/search")
    public ResponseEntity<List<Book>> searchBooks(@RequestParam String title) {
        List<Book> books = bookService.searchBooks(title);
        return ResponseEntity.ok(books);
    }
}

这个示例实现了基本的增删改查和搜索功能，您可以根据实际需求进行调整和扩展。希望能够对您有所帮助。