java - 如何在 Spring Boot 应用程序中插入 XML Prolog 到 Rest XML 响应

Question

如何在 Spring Boot 应用程序中将 XML Prolog 插入到 Rest XML 响应。

我在spring boot rest api中使用jackson xml数据格式。

我当前的 rest-xml 响应是：

<Response>
     <person id = "hello">
        <name>xyz</name>
     </person>
</Response>

虽然我想要：

<?xml version = "1.0" encoding = "UTF-8"?>
<Response>
     <person id = "hello">
        <name>xyz</name>
     </person>
</Response>

标签： javaxmlrestspring-boot

Answer 1

希望这会对某人有所帮助：有一个完整的解决方案，从 Sambit 那里得到答案，稍微调整一下并编写了以下实用程序类。请注意，convertPojoToXmlString() 返回一个 XML 字符串，然后可以将其发送回调用者：

package com.xml.util;
import java.io.IOException;
import java.io.StringWriter;

import javax.xml.stream.FactoryConfigurationError;
import javax.xml.stream.XMLOutputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamWriter;

import com.ctc.wstx.api.WstxInputProperties;
import com.fasterxml.jackson.dataformat.xml.XmlMapper;

/**
 * @author ekariyev
 *
 */
public class XmlUtil {

    private final static XMLOutputFactory xmlOutputFactory = XMLOutputFactory.newFactory();

    static {
        xmlOutputFactory.setProperty(WstxInputProperties.P_RETURN_NULL_FOR_DEFAULT_NAMESPACE, true);
    }

    /**
     * @param object
     * @return
     * @throws XMLStreamException
     * @throws IOException
     * @throws FactoryConfigurationError
     */
    public static String convertPojoToXmlString(final Object object) throws XMLStreamException, IOException {

        final StringWriter stringWriter = new StringWriter();

        try {
            final XMLStreamWriter sw = xmlOutputFactory.createXMLStreamWriter(stringWriter);
            final XmlMapper mapper = new XmlMapper();

            sw.writeStartDocument();

            mapper.writeValue(sw, object);

            sw.writeEndDocument();

            sw.flush();

        } finally {
            stringWriter.close();
        }

        return stringWriter.toString();

    }

}

该解决方案适用于：

<dependency>
    <groupId>com.fasterxml.jackson.dataformat</groupId>
    <artifactId>jackson-dataformat-xml</artifactId>
    <version>2.9.5</version>
</dependency>