使用RestTemplate:報錯Could not extract response: no suitable HttpMessageConverter found for response typ
阿新 • • 發佈:2018-12-06
專案中需要呼叫微信介面獲取access_token等一系列和微信介面相關的操作,我使用了Spring自帶的RestTemplate類來發送Get或Post請求,直接在Spring配置檔案中依賴注入
<bean id="restTemplate" class="org.springframework.web.client.RestTemplate"/>
使用的時候直接
@Resource
private RestTemplate restTemplate;
結果在呼叫微信介面的時候出了異常
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:微信介面文件雖說返回的是 Json 資料,但是同時返回的 Header 裡面的 Content-Type 值卻是 text/plain 。
最終結果就是導致 RestTemplate 把資料從 HttpResponse 轉換成 Object 的時候,找不到合適的 HttpMessageConverter 來轉換。
在報錯資訊中知道,不支援[text/plain;charset=UTF-8]型別,需要繼承 MappingJackson2HttpMessageConverter 並在構造過程中設定其支援的 MediaType 型別:
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;
}
}
參考:很厲害的作者https://blog.csdn.net/kinginblue/article/details/52706155