找不到适合响应类型的 HttpMessageConverter [英] no suitable HttpMessageConverter found for response type
问题描述
使用spring,代码如下:
Using spring, with this code :
List<HttpMessageConverter<?>> messageConverters = restTemplate.getMessageConverters();
for(HttpMessageConverter httpMessageConverter : messageConverters){
System.out.println(httpMessageConverter);
}
ResponseEntity<ProductList> productList = restTemplate.getForEntity(productDataUrl,ProductList.class);
我明白了
org.springframework.http.converter.ByteArrayHttpMessageConverter@34649ee4
org.springframework.http.converter.StringHttpMessageConverter@39fba59b
org.springframework.http.converter.ResourceHttpMessageConverter@383580da
org.springframework.http.converter.xml.SourceHttpMessageConverter@409e850a
org.springframework.http.converter.support.AllEncompassingFormHttpMessageConverter@673074aa
org.springframework.http.converter.xml.Jaxb2RootElementHttpMessageConverter@1e3b79d3
org.springframework.http.converter.json.MappingJackson2HttpMessageConverter@52bb1b26
org.springframework.web.client.RestClientException: Could not extract response: no suitable HttpMessageConverter found for response type [class com.mycopmany.ProductList] and content type [text/html;charset=UTF-8]
pojo 的一个片段:
The a snippet of the pojo :
@XmlRootElement(name="TheProductList")
public class ProductList {
@XmlElement(required = true, name = "date")
private LocalDate importDate;
推荐答案
从 Spring 的角度来看,使用 RestTemplate
注册的 HttpMessageConverter
实例都不能转换text/html
内容到 ProductList
对象.感兴趣的方法是 HttpMessageConverter#canRead(Class, MediaType)
.以上所有的实现都返回false
,包括Jaxb2RootElementHttpMessageConverter
.
From a Spring point of view, none of the HttpMessageConverter
instances registered with the RestTemplate
can convert text/html
content to a ProductList
object. The method of interest is HttpMessageConverter#canRead(Class, MediaType)
. The implementation for all of the above returns false
, including Jaxb2RootElementHttpMessageConverter
.
由于没有 HttpMessageConverter
可以读取您的 HTTP 响应,因此处理失败并出现异常.
Since no HttpMessageConverter
can read your HTTP response, processing fails with an exception.
如果你可以控制服务器响应,修改它以将Content-type
设置为application/xml
、text/xml
,或者匹配 application/*+xml
.
If you can control the server response, modify it to set the Content-type
to application/xml
, text/xml
, or something matching application/*+xml
.
如果您不控制服务器响应,则需要编写并注册自己的HttpMessageConverter
(可以扩展Spring 类,请参阅AbstractXmlHttpMessageConverter
及其子类),可以读取和转换text/html
.
If you don't control the server response, you'll need to write and register your own HttpMessageConverter
(which can extend the Spring classes, see AbstractXmlHttpMessageConverter
and its sub classes) that can read and convert text/html
.
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