如何在从端点返回的XML中添加XML声明

我已将以下内容添加到我的应用程序中

@Bean
public MappingJackson2XmlHttpMessageConverter mappingJackson2XmlHttpMessageConverter() {
    MappingJackson2XmlHttpMessageConverter xmlConverter = new MappingJackson2XmlHttpMessageConverter();
    XmlMapper objectMapper = new XmlMapper();
    objectMapper.configure(ToXmlGenerator.Feature.WRITE_XML_DECLARATION, true);
    xmlConverter.setObjectMapper(objectMapper);
    return xmlConverter;
}

但是，返回的xml如下所示，即缺少xml声明。你知道我还需要补充什么吗

<Data>
<description></description>
<codeList>
    <codeList>
        <description>User ID</description>
        <key>dfdfeee</key>
    </codeList>
    <codeList>
        <description>Activation ID</description>
        <key>2ddddd9881</key>
    </codeList>
</codeList>

用户ID
DFE
激活ID
2DD9881

声明bean：

@Bean
public MappingJackson2XmlHttpMessageConverter mappingJackson2XmlHttpMessageConverter(Jackson2ObjectMapperBuilder builder) {
    XmlMapper xmlMapper = builder.createXmlMapper(true).build();
    xmlMapper.configure(ToXmlGenerator.Feature.WRITE_XML_DECLARATION, true);
    return new MappingJackson2XmlHttpMessageConverter(xmlMapper);
}

顺便说一句，这应该覆盖在中自动配置的bean

org.springframework.boot.autoconfigure.web.JacksonHttpMessageConvertersConfiguration.MappingJackson2XmlHttpMessageConverterConfiguration

此外，如果您有，这种方法应该应用所有XmlMapper/ObjectMapper定制。

声明bean：

@Bean
public MappingJackson2XmlHttpMessageConverter mappingJackson2XmlHttpMessageConverter(Jackson2ObjectMapperBuilder builder) {
    XmlMapper xmlMapper = builder.createXmlMapper(true).build();
    xmlMapper.configure(ToXmlGenerator.Feature.WRITE_XML_DECLARATION, true);
    return new MappingJackson2XmlHttpMessageConverter(xmlMapper);
}

顺便说一句，这应该覆盖在中自动配置的bean

org.springframework.boot.autoconfigure.web.JacksonHttpMessageConvertersConfiguration.MappingJackson2XmlHttpMessageConverterConfiguration

---

此外，如果您有，这种方法应该应用所有XmlMapper/ObjectMapper自定义设置。

可能您可以尝试使用

@Order（1）

，它将替换默认bean

@Configuration
@Order(1)
public class HttpMessageConverterConfig {

    @Bean
    public MappingJackson2XmlHttpMessageConverter mappingJackson2XmlHttpMessageConverter(
            Jackson2ObjectMapperBuilder builder) {
        XmlMapper xmlMapper = builder.createXmlMapper(true).build();
        xmlMapper.configure(ToXmlGenerator.Feature.WRITE_XML_DECLARATION, true);
        return new MappingJackson2XmlHttpMessageConverter(xmlMapper);
    }

}

---

可能您可以尝试使用

@Order（1）

，它将替换默认bean

@Configuration
@Order(1)
public class HttpMessageConverterConfig {

    @Bean
    public MappingJackson2XmlHttpMessageConverter mappingJackson2XmlHttpMessageConverter(
            Jackson2ObjectMapperBuilder builder) {
        XmlMapper xmlMapper = builder.createXmlMapper(true).build();
        xmlMapper.configure(ToXmlGenerator.Feature.WRITE_XML_DECLARATION, true);
        return new MappingJackson2XmlHttpMessageConverter(xmlMapper);
    }

}