Question

我是Spring的新手，并尝试使用RestTemplate进行休息请求。 Java代码应该与下面的curl命令相同：

curl --data "name=feature&color=#5843AD" --header "PRIVATE-TOKEN: xyz" "https://someserver.com/api/v3/projects/1/labels"

但服务器拒绝使用400 Bad Request

的RestTemplate

RestTemplate restTemplate = new RestTemplate();
HttpHeaders headers = new HttpHeaders();
headers.add("PRIVATE-TOKEN", "xyz");
HttpEntity<String> entity = new HttpEntity<String>("name=feature&color=#5843AD", headers);
ResponseEntity<LabelCreationResponse> response = restTemplate.exchange("https://someserver.com/api/v3/projects/1/labels", HttpMethod.POST, entity, LabelCreationResponse.class);

有人可以告诉我我做错了吗？

Answer 1

我认为问题在于，当您尝试向服务器发送数据时，没有设置内容类型标题，该标题应该是两个中的一个：＆＃34; application / json＆＃34;或＆＃34; application / x-www-form-urlencoded＆＃34; 。在你的情况下是：＆＃34; application / x-www-form-urlencoded＆＃34;根据您的样本参数（名称和颜色）。此标头表示＆＃34;客户端向服务器发送的数据类型＆＃34;。

RestTemplate restTemplate = new RestTemplate();

HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
headers.add("PRIVATE-TOKEN", "xyz");

MultiValueMap<String, String> map =
    new LinkedMultiValueMap<String, String>();
map.add("name","feature");
map.add("color","#5843AD");

HttpEntity<MultiValueMap<String, String>> entity =
    new HttpEntity<MultiValueMap<String, String>>(map, headers);

ResponseEntity<LabelCreationResponse> response =
    restTemplate.exchange("https://foo/api/v3/projects/1/labels",
                          HttpMethod.POST,
                          entity,
                          LabelCreationResponse.class);

Answer 2

您需要将Content-Type设置为application / json。必须在请求中设置Content-Type。以下是用于设置Content-Type

的修改代码

final String uri = "https://someserver.com/api/v3/projects/1/labels";
String input = "US";
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
headers.add("PRIVATE-TOKEN", "xyz");
HttpEntity<String> request = new HttpEntity<String>(input, headers);
ResponseEntity<LabelCreationResponse> response = restTemplate.postForObject(uri, request,  LabelCreationResponse.class);

这里，HttpEntity是用您的输入构建的，即“US”和标题。如果有效，请告诉我，如果没有，请分享例外情况。干杯！

Answer 3

如果标题是有效标题，可能是标题问题检查，是否指的是＆＃34; BasicAuth＆＃34;头？

HttpHeader headers = new HttpHeaders();
    headers.add("Content-Type", MediaType.APPLICATION_FORM_URLENCODED.toString());
    headers.add("Accept", MediaType.APPLICATION_JSON.toString()); //Optional in case server sends back JSON data

    MultiValueMap<String, String> requestBody = new LinkedMultiValueMap<String, String>();
    requestBody.add("name", "feature");
    requestBody.add("color", "#5843AD");

    HttpEntity formEntity = new HttpEntity<MultiValueMap<String, String>>(requestBody, headers);

    ResponseEntity<LabelCreationResponse> response = 
                    restTemplate.exchange("https://example.com/api/request", HttpMethod.POST, 
                                          formEntity, LabelCreationResponse.class);

Answer 4

我的问题，MessageConverters 包含其他转换器可能会将实体转换为 json（如 FastJsonHttpMessageConverter）。所以我在前面添加了 FormHttpMessageConverter 并且效果很好。

<T> JuheResult<T> postForm(final String url, final MultiValueMap<String, Object> body) {
    HttpHeaders headers = new HttpHeaders();
    headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
    HttpEntity<MultiValueMap<String, Object>> requestEntity = new HttpEntity<>(body, headers);
    return exchange(url, HttpMethod.POST, requestEntity);
}

<T> JuheResult<T> exchange(final String url, final HttpMethod method, final HttpEntity<?> requestEntity) {
    ResponseEntity<JuheResult<T>> response = restTemplate.exchange(url, method, requestEntity,
            new JuheResultTypeReference<>());
    logger.debug("调用结果 {}", response.getBody());
    return response.getBody();
}

public JuheSupplierServiceImpl(RestTemplateBuilder restTemplateBuilder) {
    Duration connectTimeout = Duration.ofSeconds(5);
    Duration readTimeout = Duration.ofSeconds(5);

    restTemplate = restTemplateBuilder.setConnectTimeout(connectTimeout).setReadTimeout(readTimeout)
            .additionalInterceptors(interceptor()).build();
    restTemplate.getMessageConverters().add(0, new FormHttpMessageConverter());
}

fastjson 防止 resttemplate 转换 json 以外的其他媒体类型

具有URL编码数据的Spring RestTemplate POST请求

4 个答案: