我想做一個可以接受兩個 Path 變數的 api，其中一個變數是可選的。在這篇
由于我使用 JHipster 生成了我的 Spring Boot 應用程式，因此當我沒有給出 Optional 引數的值時，在郵遞員上。我收到了這個錯誤
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如果有人能幫助我理解為什么會發生這種情況和/或如何解決它，我將不勝感激。先感謝您。
uj5u.com熱心網友回復：
也許嘗試將 2 個路徑添加到 @GetMapping？
@GetMapping("/users/{dateDu}", "/users/{dateDu}/{??dateAu}")
uj5u.com熱心網友回復：
不確定這是否能解決您的問題，但您可能應該洗掉引數注釋中的 false 標志：
@PathVariable Optional<LocalDate> dateAu并添加兩個路徑：@GetMapping(value = {"/users/{dateDu}", "/users/{dateDu}/{dateAu}"})。
uj5u.com熱心網友回復：
你應該改變你的
@GetMapping("/users/{dateDu}/{dateAu}")
至
@GetMapping(value = {"/users/{dateDu}", "/users/{dateDu}/{dateAu}"})
看起來你根本不需要Optional。請注意，Optional它旨在用作回傳型別。不建議嘗試將其用作引數。參考：https ://rules.sonarsource.com/java/RSPEC-3553
我嘗試在沒有以下情況下重構您的代碼Optional：
@GetMapping(value = {"/users/{dateDu}", "/users/{dateDu}/{dateAu}"})
public ResponseEntity<List<User>> getAllUsersByDate(
@PathVariable LocalDate dateDu,
@PathVariable(required = false) LocalDate dateAu,
@org.springdoc.api.annotations.ParameterObject Pageable pageable) {
dateAu = dateAu == null ? LocalDate.now() : dateAu;
Page<User> page = userRepository.getUsersByDate(dateDu, dateAu, pageable);
HttpHeaders headers = PaginationUtil
.generatePaginationHttpHeaders(ServletUriComponentsBuilder.fromCurrentRequest(), page);
return ResponseEntity.ok().headers(headers).body(page.getContent());
}
那么它應該是作業。
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