Java XML api 在自关闭标签之前删除空格

Question

我有一个只包含一个元素的 XML 文件

<Message>

    <Location URI ="XXX:XXX:XXX" />

</Message>

我想使用 Java 读取和打印相同的 XML，但打印后它在 /> 之前丢失了空格

<Message>

    <Location URI ="XXX:XXX:XXX"/>

</Message>

我尝试了 DocumentBuilderFactory 和 Transformer 的不同配置，但结果是一样的。

任何想法？

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();

DocumentBuilder builder = factory.newDocumentBuilder();

Document requestDocument = builder.parse(this.getClass().getResourceAsStream("/message-template.xml"));

TransformerFactory tf = TransformerFactory.newInstance();

Transformer transformer = tf.newTransformer();

transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");

DOMSource domSource = new DOMSource(requestDocument);

StringWriter writer = new StringWriter();

StreamResult result = new StreamResult(writer);

transformer.transform(domSource, result);

System.out.println(writer.toString());