如何在Jackson xml解析器中将octet-stream解析为json？

Question

我有时收到一个web服务响应，其中content-type=application/octet-stream设置，无论如何它实际上是application/xml。

由于我无法控制网络服务，我仍然想告诉杰克逊（我正在使用spring-boot）将这些响应解析为xml。但是怎么样？

我首先尝试为jackson mapper提供octet-stream，这对于目前为止工作：

@Bean
public RestTemplateCustomizer customizeJackson2MessageConverter() {
    return restTemplate -> {
        for (var converter : restTemplate.getMessageConverters()) {
            if (converter instanceof MappingJackson2HttpMessageConverter) { 
                jackson.getSupportedMediaTypes().add((MediaType.APPLICATION_OCTET_STREAM);
            }
        }
    };
}

但是：当它进入解析时，如何告诉jackson忽略/重写内容类型，并仍然将其解析为普通的json？

Caused by: org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: Unexpected character ('<' (code 60)): expected a valid value (number, String, array, object, 'true', 'false' or 'null'); nested exception is com.fasterxml.jackson.core.JsonParseException: Unexpected character ('<' (code 60)): expected a valid value (number, String, array, object, 'true', 'false' or 'null')
 at [Source: (ByteArrayInputStream); line: 1, column: 2]
    at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.readJavaType(AbstractJackson2HttpMessageConverter.java:245) ~[spring-web-5.1.6.RELEASE.jar:5.1.6.RELEASE]
    at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.read(AbstractJackson2HttpMessageConverter.java:227) ~[spring-web-5.1.6.RELEASE.jar:5.1.6.RELEASE]
    at org.springframework.web.client.HttpMessageConverterExtractor.extractData(HttpMessageConverterExtractor.java:102) ~[spring-web-5.1.6.RELEASE.jar:5.1.6.RELEASE]
    ... 113 more

Answer 1

我按照@chrylis的建议做了：

public class ContentTypeInterceptor implements ClientHttpRequestInterceptor {
    @Override
    public ClientHttpResponse intercept(HttpRequest request, byte[] body, ClientHttpRequestExecution execution) throws IOException {
        ClientHttpResponse http = execution.execute(request, body);

        HttpHeaders headers = http.getHeaders();
        if (headers.getContentType() == MediaType.APPLICATION_OCTET_STREAM) {
            headers.setContentType(MediaType.APPLICATION_XML);
        }

        return http;
    }
}