春天RestTemplate沒有內容類型

Question

我用彈簧機器人連接到服務器獲取JSON並將其映射到一個對象類：

罐子：

jackson-core-asl-1.9.2.jar 
jackson-mapper-asl-1.9.2.jar 
spring-android-auth-1.0.0.M4.jar 
spring-android-core-1.0.0.M4.jar 
spring-android-rest-template-1.0.0.M4.jar 

來源：

RestTemplate restTemplate = new RestTemplate(/* clientHttpRequestFactory */); 

ClientHttpRequestFactory clientHttpRequestFactory = new SimpleClientHttpRequestFactory(); 
restTemplate.setRequestFactory(clientHttpRequestFactory); 

MappingJacksonHttpMessageConverter httpMessageConverter = new MappingJacksonHttpMessageConverter(); 
List<MediaType> supportedMediaTypes = new ArrayList<MediaType>(); 
supportedMediaTypes.add(new MediaType("application", "json")); 
httpMessageConverter.setSupportedMediaTypes(supportedMediaTypes); 

List<HttpMessageConverter<?>> httpMessageConverters = restTemplate 
       .getMessageConverters(); 
httpMessageConverters.add(httpMessageConverter); 
restTemplate.setMessageConverters(httpMessageConverters); 

MultiValueMap<String, Object> map = new LinkedMultiValueMap<String, Object>(); 
map.add("param1", "param1"); 
map.add("param2", "2"); 

T t = restTemplate.postForObject(url, map, T.class); 

來自服務器的結果是一個json字符串，如：

{"aaa":"111", "bbb":"222"} 

結果是：

Caused by: org.springframework.web.client.RestClientException: Cannot extract response: no Content-Type found 
    at org.springframework.web.client.HttpMessageConverterExtractor.extractData(HttpMessageConverterExtractor.java:60) 
    at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:470) 
    at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:425) 
    at org.springframework.web.client.RestTemplate.postForObject(RestTemplate.java:303) 

必須有在響應標頭中沒有Content-Type。我怎樣才能讓RestTemplate不在乎Content-Type？

Answer 1

這看起來像是繼承自Spring 3.0.x代碼的一個缺陷。有關詳細信息，請參閱https://jira.springsource.org/browse/SPR-7911。您可以嘗試列出的解決方法之一here