这里的主要问题是从服务接收到的 ，但是实际的内容类型应该是
为了克服这个问题，您可以引入自定义消息转换器。并为所有类型的响应注册它（即忽略响应内容类型标头）。像这样
List<HttpMessageConverter<?>> messageConverters = new ArrayList<HttpMessageConverter<?>>();//Add the Jackson Message converterMappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();// Note: here we are making this converter to process any kind of response, // not only application/*json, which is the default behavIoUrconverter.setSupportedMediaTypes(Collections.singletonList(MediaType.ALL));messageConverters.add(converter); restTemplate.setMessageConverters(messageConverters);解决方法
使用curl命令：
curl -u 591bf65f50057469f10b5fd9:0cf17f9b03d056ds0e11e48497e506a2 https://backend.tdk.com/api/devicetypes/59147fd79e93s12e61499ffe/messages
我收到JSON响应：
{'data':[{'device':'18SE62','time':1494516023,'data':'3235','snr':'36.72',...
我将响应保存在一个txt文件中，然后使用杰克逊进行解析，一切都很好
ObjectMapper mapper = new ObjectMapper();File f = new File(getClass().getResource ('/result.json').getFile());MessageList messageList = mapper.readValue(f,MessageList.class);
我认为我应该使用RestTemplate得到相同的结果，但事实并非如此
RestTemplate restTemplate = new RestTemplate();MessageList messageList = restTemplate.getForObject('http://592693f43c87815f9b8145e9:f099c85d84d4e325a2186c02bd0caeef@backend.tdk.com/api/devicetypes/591570373c87894b4eece34d/messages',MessageList.class);
我出现了错误
Exception in thread 'main' org.springframework.web.client.RestClientException: Could not extract response: no suitable HttpMessageConverter found for response type [class com.tdk.domain.backend.MessageList] and content type [text/html;charset=iso-8859-1] at org.springframework.web.client.HttpMessageConverterExtractor.extractData(HttpMessageConverterExtractor.java:109) at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:655) at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:613) at org.springframework.web.client.RestTemplate.getForObject(RestTemplate.java:287) at com.tdk.controllers.restful.client.RestTemplateExample.main(RestTemplateExample.java:27)
我试图设置contentType：
HttpHeaders headers = new HttpHeaders();headers.setContentType(MediaType.APPLICATION_JSON);HttpEntity<String> entity = new HttpEntity<String>('parameters',headers);MessageList messageList = restTemplate.getForObject(url,entity,MessageList.class);
但是我得到了一个编译错误
The method getForObject(String,Class<T>,Object...) in the type RestTemplate is not applicable for the arguments (String,HttpEntity<String>,Class<MessageList>)
我还尝试添加一个Jackson消息转换器
List<HttpMessageConverter<?>> messageConverters = new ArrayList<HttpMessageConverter<?>>(); //Add the Jackson Message converter messageConverters.add(new MappingJackson2HttpMessageConverter());//Add the message converters to the restTemplate restTemplate.setMessageConverters(messageConverters); MessageList messageList = restTemplate.getForObject(url,MessageList.class);
但是后来我得到了这个错误：
Exception in thread 'main' org.springframework.web.client.RestClientException: Could not extract response: no suitable HttpMessageConverter found for response type [class com.tdk.domain.backend.MessageList] and content type [text/html;charset=iso-8859-1] at org.springframework.web.client.HttpMessageConverterExtractor.extractData(HttpMessageConverterExtractor.java:109) at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:655) at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:613) at org.springframework.web.client.RestTemplate.getForObject(RestTemplate.java:287) at com.tdk.controllers.restful.client.RestTemplateExample.main(RestTemplateExample.java:51)
我也尝试添加课程
@Configuration@EnableWebMvcpublic class MvcConf extends WebMvcConfigurationSupport { protected void configureMessageConverters(List<HttpMessageConverter<?>> converters) {converters.add(converter());addDefaultHttpMessageConverters(converters); } @Bean MappingJackson2HttpMessageConverter converter() {MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();return converter; }}
但我得到了错误：
org.springframework.web.client.RestClientException: Could not extract response: no suitable HttpMessageConverter found for response type [class com.tdk.domain.backend.MessageList] and content type [text/html;charset=iso-8859-1] at org.springframework.web.client.HttpMessageConverterExtractor.extractData(HttpMessageConverterExtractor.java:109) at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:655) at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:613) at org.springframework.web.client.RestTemplate.getForObject(RestTemplate.java:287)
