使用RestTemplate:报错Could not extract response: no suitable HttpMessageConverter found for response typ

项目中需要调用微信接口获取access_token等一系列和微信接口相关的操作，我使用了Spring自带的RestTemplate类来发送Get或Post请求，直接在Spring配置文件中依赖注入

<bean id="restTemplate" class="org.springframework.web.client.RestTemplate"/>

使用的时候直接

@Resource
private RestTemplate restTemplate;

结果在调用微信接口的时候出了异常

Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed;
nested exception is org.springframework.web.client.RestClientException:
Could not extract response: no suitable HttpMessageConverter found for response type [] and content type [text/plain;charset=UTF-8]] with root cause org.springframework.web.client.RestClientException:
Could not extract response: no suitable HttpMessageConverter found for response type [] and content type [text/plain;charset=UTF-8]

原因：微信接口文档虽说返回的是 Json 数据，但是同时返回的 Header 里面的 Content-Type 值却是 text/plain 。

最终结果就是导致 RestTemplate 把数据从 HttpResponse 转换成 Object 的时候，找不到合适的 HttpMessageConverter 来转换。

在报错信息中知道，不支持[text/plain;charset=UTF-8]类型，需要继承 MappingJackson2HttpMessageConverter 并在构造过程中设置其支持的 MediaType 类型：

public class WxMappingJackson2HttpMessageConverter extends MappingJackson2HttpMessageConverter {public WxMappingJackson2HttpMessageConverter(){List<MediaType> mediaTypes = new ArrayList<>();mediaTypes.add(MediaType.TEXT_PLAIN);mediaTypes.add(MediaType.TEXT_HTML); setSupportedMediaTypes(mediaTypes);}
}

public class RestTemplateUtil {public static RestTemplate getInstance() {RestTemplate restTemplate = new RestTemplate();restTemplate.getMessageConverters().add(new WxMappingJackson2HttpMessageConverter());return restTemplate;}
}

参考：很厉害的作者https://blog.csdn.net/kinginblue/article/details/52706155

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