Error while extracting response for type [] and content type []，json返回值被解析为xml

在使用restTemplate请求restful接口时，在特定情况下总会将返回的json数据解析为xml数据然后处理，接着就会爆出标题中的错误：

Error while extracting response for type [] and content type [application/xml;charset=UTF-8]; nested exception is org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: Unexpected character '5' (code 53) in content after '<' (malformed start element?).
at [row,col {unknown-source}]: [1,15395]; nested exception is com.fasterxml.jackson.databind.JsonMappingException: Unexpected character '5' (code 53) in content after '<' (malformed start element?).

根据错误信息来看，似乎响应头标记了返回类型为[application/xml;charset=UTF-8]，然而实际情况是所有的返回数据都是[application/json;charset=UTF-8]。

跟踪restTemplate源码，发现由new RestTemplate(httpRequestFactory())创建的实例会有7个converter:

继续跟踪restTemplate的exchange，当对response进行类型转换时，会迭代当前实例中所有的converter，然后选择一个支持当前类型的converter执行，使用canRead来判断：

此时就发现了问题，在特定情况下，响应头的contentType被读作了"application/xml"，然而此时的真实数据仍然为json格式。所以将用于xml格式的converter删除，则迭代器会寻找下一个可执行的converter即MappingJackson2HttpMessageConverter。或者将二者顺序换一下，降低xml的优先级。

解决办法：

1：删除xml的转换器

    @Beanpublic RestTemplate restTemplate() {RestTemplate template = new RestTemplate(httpRequestFactory());// 排除掉xml的解析converter，避免将json数据当做xml解析List<HttpMessageConverter<?>> collect = template.getMessageConverters().stream().filter(m -> !(m instanceof MappingJackson2XmlHttpMessageConverter)).collect(Collectors.toList());template.setMessageConverters(collect);return template;}

2：降低xml转换器优先级

    @Beanpublic RestTemplate restTemplate() {RestTemplate template = new RestTemplate(httpRequestFactory());// 将xml解析的优先级调低int xml = 0, json = 0;List<HttpMessageConverter<?>> messageConverters = template.getMessageConverters();for (int i = 0; i < messageConverters.size(); i++) {HttpMessageConverter<?> h = messageConverters.get(i);if (h instanceof MappingJackson2XmlHttpMessageConverter) {xml = i;} else if (h instanceof MappingJackson2HttpMessageConverter) {json = i;}}Collections.swap(template.getMessageConverters(), xml, json);return template;}

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