尝试使用 POST RestTemplate 调用外部 API 时出现 BadRequest 400

Question

我必须在 Java Spring 中调用一个外部 API，在其中我必须按如下方式传递 JSON 对象（XXX 和 YYY 是参数）。如何使用以下类传递这个 JSON 对象？

{
  "codecConfigId": "XXXXXXXX", 
  "inputStreams": [{
    "inputId": "Input_Teste_1024_1",
    "inputPath": "YYYYYYYYYYYYY",
    "selectionMode": "AUTO"
  }]
}

我尝试了什么

StreamsForCodecs streams = new StreamsForCodecs();
streams.setCodecConfigId(codecConfigId);
streams.setInputStream(path.toString());

MultiValueMap<String, String> headers = new LinkedMultiValueMap<String, String>();
HashMap<String, String> map = new HashMap<String, String>();
map.put("Content-Type", "application/json");
map.put("x-api-key", "XXXXXXX");
map.put("Accept", "application/json");

StreamsForCodecs 是一个与另一个类相关联的类，因为我需要传递上面的 JSON，所以我创建了这两个类。

public class StreamsForCodecs implements Serializable {

    private static final long serialVersionUID = 1L;
    private String codecConfigId;
    ArrayList<InputStreamsCodec> inputStreams = new ArrayList<InputStreamsCodec>();

...
    // Setter Methods

    public void setCodecConfigId(String codecConfigId) {
        this.codecConfigId = codecConfigId;
    }

    public void setInputStream(String path) {
        InputStreamsCodec inputStreamsCodec = new InputStreamsCodec();
        inputStreamsCodec.setInputPath(path);
        inputStreams.add(inputStreamsCodec);
    }

}

class InputStreamsCodec implements Serializable {

    private static final long serialVersionUID = 1L;
    private String inputPath;
...
Some GetAndSetters

    public void setInputPath(String inputPath) {
        this.inputPath = inputPath;
    }
}

我也尝试了requestEntity、request、RestTemplate.postForEntity 和RestTemplate.exchange，但在所有情况下我都收到了错误的请求。当我尝试从 POSTman 调用它时，我没有收到错误消息。

HttpEntity<StreamsForCodecs> requestEntity = new HttpEntity(streams, headers);
request = new HttpEntity(requestEntity, headers);
ResponseEntity<StreamsForCodecsResponse> response= new RestTemplate().exchange(url, HttpMethod.POST, requestEntity, StreamsForCodecsResponse.class);
//ResponseEntity<StreamsForCodecsResponse> response= new //RestTemplate().postForEntity(url, request, StreamsForCodecsResponse.class);
System.out.println(response.getBody());

这是异常堆栈跟踪的一部分。

org.springframework.web.client.HttpClientErrorException$BadRequest: 400 Bad Request
    at org.springframework.web.client.HttpClientErrorException.create(HttpClientErrorException.java:79) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]
    at org.springframework.web.client.DefaultResponseErrorHandler.handleError(DefaultResponseErrorHandler.java:122) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]
    at org.springframework.web.client.DefaultResponseErrorHandler.handleError(DefaultResponseErrorHandler.java:102) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]
    at org.springframework.web.client.ResponseErrorHandler.handleError(ResponseErrorHandler.java:63) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]
    at org.springframework.web.client.RestTemplate.handleResponse(RestTemplate.java:778) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]
    at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:736) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]
    at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:670) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]
    at org.springframework.web.client.RestTemplate.exchange(RestTemplate.java:579) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]
    at com.carlosdv93.controller.CreateStreamsForCodecs.createStreamsForCodecsPOST(CreateStreamsForCodecs.java:42) ~[classes/:na]

Answer 1

您没有发送正确的 http 标头，您将所有正确的标头放在 map 对象中但从未发送过，更改您的代码并填充 headers 对象而不是 map nad 并使用请求：

MultiValueMap<String, String> headers = new LinkedMultiValueMap<String, String>();
headers.add("Content-Type", "application/json");
headers.add("x-api-key", "XXXXXXX");
headers.add("Accept", "application/json");

您也可以使用HttpHeaders 来设置标题：

HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType. APPLICATION_JSON);
headers.set("x-api-key", "XXXXXXX");
headers.setAccept(Collections.singletonList(MediaType.APPLICATION_JSON));
HttpEntity<StreamsForCodecs> requestEntity = new HttpEntity<>(streams, headers);
ResponseEntity<StreamsForCodecsResponse> response = new RestTemplate().exchange(url, HttpMethod.POST, requestEntity, StreamsForCodecsResponse.class);

Answer 2

我猜你没有将你的对象转换为 JSON。

    JSONObject requestJson = new JSONObject(streams).toString();
    HttpEntity<StreamsForCodecs> requestEntity = new HttpEntity<>(requestJson , headers);

希望这会有所帮助 使用fullstack guy提到的HttpHeaders和HttPEntity