在SpringBoot中使用HATEOAS的方法

@Data
@Entity
public class Book {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    private String title;
}

{
    "content": {
        "id": 1,
        "title": "The Hobbit"
    },
    "_links": {
        "self": {
            "href": "http://localhost:8080/book/1"
        }
    }
}

spring.jpa.hibernate.ddl-auto=validate
spring.datasource.url=jdbc:h2:mem:testdb
spring.datasource.driverClassName=org.h2.Driver
spring.datasource.username=sa
spring.datasource.password=password
spring.jpa.database-platform=org.hibernate.dialect.H2Dialect

public interface BookRepository extends CrudRepository<Book, Long> {
    long deleteByTitle(String title);

    @Modifying
    @Query("delete from Book b where b.title=:title")
    void deleteBooks(@Param("title") String title);
}

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-hateoas</artifactId>
        </dependency>

public class BookModel extends RepresentationModel<BookModel> {
    private final Book content;
    @JsonCreator
    public BookModel(@JsonProperty("content") Book content) {
        this.content = content;
    }
    public Book getContent() {
        return content;
    }
}

	@RequestMapping("/book/{id}")
	public HttpEntity<Book> getBook(@PathVariable("id") Long id) {
		Book book= bookRepository.findById(id).get();
		BookModel bookModel = new BookModel(book);
		bookModel.add(linkTo(methodOn(BookController.class).getBook(id)).withSelfRel());
		return new ResponseEntity(bookModel, HttpStatus.OK);
	}

    @Test
    void envEndpointNotHidden() throws Exception {
        mockMvc.perform(get("/book/1"))
                .andExpect(jsonPath("$.content.title").value("The Hobbit"));
    }

	@Test
	void envEndpointNotHidden() throws Exception {
		Traverson traverson = new Traverson(new URI("http://localhost:" + this.port + "/book/1"), MediaTypes.HAL_JSON);
		String bookTitle = traverson.follow("self").toObject("$.content.title");
		assertThat(bookTitle).isEqualTo("The Hobbit");
	}