在SpringBoot中使用RickandMorty的API回傳Null

我正在嘗試了解 Spring Boot 中的 API，并且我正在努力使用 Rick and Morty API，當我提供 getAllCharacters 時，API 會毫無問題地回傳所有字符，但是，例如，當我嘗試只檢索一個字符（使用相同的邏輯，只是更改端點）

服務：

package com.burakkutbay.springbootresttemplateexample.service;

import com.burakkutbay.springbootresttemplateexample.pojo.Character;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.*;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestTemplate;

import java.util.List;

@Service
public class ApiServiceImpl implements ApiService {

    @Autowired
    private RestTemplate restTemplate;

    @Autowired
    private HttpHeaders httpHeaders;

    private static final String CHAHRACTER_API = "https://rickandmortyapi.com/api/character";

    @Override
    public Character getAllCharacter() {

        httpHeaders.setAccept(List.of(MediaType.APPLICATION_JSON));

        HttpEntity<String> entity = new HttpEntity<>(httpHeaders);

        ResponseEntity<Character> response = restTemplate.exchange(CHAHRACTER_API, HttpMethod.GET,
                entity, Character.class);

        return response.getBody();
    }
}

控制器

package com.burakkutbay.springbootresttemplateexample.controller;

import com.burakkutbay.springbootresttemplateexample.pojo.Character;
import com.burakkutbay.springbootresttemplateexample.service.ApiService;
import com.burakkutbay.springbootresttemplateexample.service.ApiServiceImpl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class ApiController {

    @Autowired
    private ApiService apiService;

    @GetMapping("/")
    public ResponseEntity<Character> getCharacters() {
        Character characters = apiService.getAllCharacter();
        return new ResponseEntity<>(characters, HttpStatus.OK);
    }
}

該代碼回傳所有字符，但是，只是為了了解，如果我試圖獲取更改服務類中private static final String CHAHRACTER_API = "https://rickandmortyapi.com/api/character";for的特定字符private static final String CHAHRACTER_API = "https://rickandmortyapi.com/api/character/2";，則回傳 null

{
    "info": null,
    "results": null
}

?誰能解釋一下為什么可以檢索json的許多元素但不能檢索一個？

謝謝！

uj5u.com熱心網友回復：

獲取所有字符的 api 的 JSON 回應是這樣的結構：

https://rickandmortyapi.com/api/character

{
    "info": {
    "count": 826,
    "pages": 42,
    "next": "https://rickandmortyapi.com/api/character/?page=2",
    "prev": null
    }
    "results": [
    {
      "id": 1,
      "name": "Rick Sanchez",
      "status": "Alive",
      "species": "Human",
      "type": "",
      "gender": "Male",
      "origin": {
        "name": "Earth",
        "url": "https://rickandmortyapi.com/api/location/1"
      },
      "location": {
        "name": "Earth",
        "url": "https://rickandmortyapi.com/api/location/20"
      },
      "image": "https://rickandmortyapi.com/api/character/avatar/1.jpeg",
      "episode": [
        "https://rickandmortyapi.com/api/episode/1",
        "https://rickandmortyapi.com/api/episode/2",
        // ...
      ],
      "url": "https://rickandmortyapi.com/api/character/1",
      "created": "2017-11-04T18:48:46.250Z"
    },
   ]
}

而獲取單個字符的 api 的 JSON 回應具有不同的結構：

https://rickandmortyapi.com/api/character/2

{
  "id": 2,
  "name": "Morty Smith",
  "status": "Alive",
  "species": "Human",
  "type": "",
  "gender": "Male",
  "origin": {
    "name": "Earth",
    "url": "https://rickandmortyapi.com/api/location/1"
  },
  "location": {
    "name": "Earth",
    "url": "https://rickandmortyapi.com/api/location/20"
  },
  "image": "https://rickandmortyapi.com/api/character/avatar/2.jpeg",
  "episode": [
    "https://rickandmortyapi.com/api/episode/1",
    "https://rickandmortyapi.com/api/episode/2",
    // ...
  ],
  "url": "https://rickandmortyapi.com/api/character/2",
  "created": "2017-11-04T18:50:21.651Z"
}

如您所見"results"，單字符 JSON 回應中沒有 Array 物件。因此，您需要相應地閱讀回應。

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