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());