没有找到适合响应类型的 HttpMessageConverter

no suitable HttpMessageConverter found for response type(没有找到适合响应类型的 HttpMessageConverter)

问题描述

使用弹簧，使用此代码:

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 的片段:

@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.

如果您可以控制服务器响应，请将其修改为将 Content-type 设置为 application/xml、text/xml 或与 application/*+xml 匹配的东西.

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，则需要编写和注册自己的 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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