RestClientException:无法提取响应.找不到合适的HttpMessageConverter [英] RestClientException: Could not extract response. no suitable HttpMessageConverter found

问题描述

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txt文件中，然后使用杰克逊解析它，一切都很好

I save the response on a txt file and parse it using jackson, and everything is fine

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

and I assume I should get the same result using RestTemplate but that's not the case

RestTemplate restTemplate = new RestTemplate();
        MessageList messageList = 
                restTemplate.getForObject("http://592693f43c87815f9b8145e9:[e-mail]/api/devicetypes/591570373c87894b4eece34d/messages", MessageList.class);

我改错了

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)

我尝试设置contentType:

I tried to set the 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);

但随后出现编译错误

The method getForObject(String, Class<T>, Object...) in the type RestTemplate is not applicable for the arguments (String, HttpEntity<String>, 
 Class<MessageList>)

我还试图添加一个Jackson消息转换器

I also tried to add a the Jackson Message converter

  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:

But then I got this error:

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
@EnableWebMvc
public class MvcConf extends WebMvcConfigurationSupport {

    protected void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        converters.add(converter());
        addDefaultHttpMessageConverters(converters);
    }

    @Bean
    MappingJackson2HttpMessageConverter converter() {

        MappingJackson2HttpMessageConverter converter 
                    = new MappingJackson2HttpMessageConverter();
        return converter;
    }

}

但是我得到了错误:

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)

推荐答案

此处的主要问题是从服务接收到的内容类型[text/html; charset = iso-8859-1] ，实际内容类型应为 application/json; charset = iso-8859-1

The main problem here is content type [text/html;charset=iso-8859-1] received from the service, however the real content type should be application/json;charset=iso-8859-1

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).就是这样

In order to overcome this you can introduce custom message converter. and register it for all kind of responses (i.e. ignore the response content type header). Just like this

List<HttpMessageConverter<?>> messageConverters = new ArrayList<HttpMessageConverter<?>>();        
//Add the Jackson Message converter
MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();

// Note: here we are making this converter to process any kind of response, 
// not only application/*json, which is the default behaviour
converter.setSupportedMediaTypes(Collections.singletonList(MediaType.ALL));        
messageConverters.add(converter);  
restTemplate.setMessageConverters(messageConverters); 

这篇关于RestClientException:无法提取响应.找不到合适的HttpMessageConverter的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！