found for response type [class [B] and content type [image/jpeg]

• RestTemplate报错found for response type [class [B] and content type [image/jpeg]。
• 解决方案：增加消息转换器。

// 常用的2个StringHttpMessageConverter、MappingJackson2HttpMessageConverter
StringHttpMessageConverter m = new StringHttpMessageConverter(Charset.forName("UTF-8"));
RestTemplate restTemplate = new RestTemplateBuilder().additionalMessageConverters(m).additionalMessageConverters(new MappingJackson2HttpMessageConverter()).build();
// 重点是要增加这个
restTemplate.getMessageConverters().add(new ByteArrayHttpMessageConverter());