您能否帮助我，并解释一下我该如何传递作者价值？
@GetMapping(value = "/search")
public ResponseEntity<List<Book>> searchBooksByTitleAndAuthor(
@RequestParam(value = "title", required = false) final String title,
@RequestParam(value = "author", required = false) final Author author) {
HttpStatus httpStatus = HttpStatus.OK;
List<Book> books = null;
if (title == null && author == null) {
log.info("Empty request");
httpStatus = HttpStatus.BAD_REQUEST;
} else if (title == null || author == null) {
books = bookService.getBooksByTitleOrAuthor(title, author);
} else {
Optional<Book> book = bookService.getBookByTitleAndAuthor(title, author);
if (book.isPresent()) {
books = Arrays.asList(book.get());
}
}
if (books == null) {
return new ResponseEntity<>(httpStatus);
} else {
return new ResponseEntity<>(books, httpStatus);
}
}
和
Author类看起来像：@Entity
@NoArgsConstructor
@AllArgsConstructor
@Getter
@EqualsAndHashCode
@ToString
public final class Author {
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
private Long id;
private String name;
private LocalDate dateOfBirth;
private String bio;
}
在这种情况下，使用author或@RequestParam代替请求正文是一种好方法吗？
我考虑过只请求作者姓名的String，但这会影响服务的方法。
最佳答案
根据https://lankydanblog.com/2017/03/11/passing-data-transfer-objects-with-get-in-spring-boot/，...您可以（在author.dateOfBirth上设置一些转换注释之后）：
在String参数上使用@RequestParam（然后让您的控制器/某人
进行转换）：
..., @RequestParam(value = "author", required = false) final String author) {
...final Author author = new ObjectMapper().setDateFormat(simpleDateFormat)
.readValue(author, Author.class);
在这种情况下，您会要求：
http://localhost:8080/myApp/search?title=foo&author={"id"="1",...}
或者：省略
@RequestParam，但是传递对象（并让spring进行转换）：...(@RequestParam(value = "title", required = false) final String title,
final Author author)
并要求像：
http://localhost:8080/myApp/search?title=foo&id=1&name=Donald E. Knuth&...
也可以看看：
Spring MVC: Complex object as GET @RequestParam
Spring REST - binding GET parameters to nested objects
Spring map GET request parameters to POJO automatically