MappingJackson2HttpMessageConverter

MappingJackson2HttpMessageConverter 默认只支持 application/json 格式，，如果服务器返回的是text/plain不能转换

扩展一个可以转换text/plain的转换器：

public class RestTemplateMessageConverter extends MappingJackson2HttpMessageConverter {

    public RestTemplateMessageConverter() {
        List<MediaType> mediaTypeList = new ArrayList<>();
        mediaTypeList.add(MediaType.APPLICATION_JSON);
        mediaTypeList.add(MediaType.TEXT_PLAIN);
        setSupportedMediaTypes(mediaTypeList);
    }
}

注入restTemplate

  @Bean
    public RestTemplate restTemplate(){
        RestTemplate restTemplate = new RestTemplate();
        List<HttpMessageConverter<?>> messageConverters = restTemplate.getMessageConverters();
        messageConverters.add(new RestTemplateMessageConverter());
        return restTemplate;
    }