Java XML dom:防止折叠空元素 [英] Java XML dom: prevent collapsing empty element

问题描述

我使用 javax.xml.parsers.DocumentBuilder ，并想将 org.w3c.dom.Document 写入文件.

I use the javax.xml.parsers.DocumentBuilder, and want to write a org.w3c.dom.Document to a file.

如果元素为空，则默认输出为折叠:

If there is an empty element, the default output is a collapsed:

<element/>

我可以更改此行为，以便不折叠元素吗?即:

Can I change this behavior so that is doesn't collapse the element? I.e.:

<element></element>

感谢您的帮助.

推荐答案

这实际上取决于您将文档写入文件的方式，并且与DOM本身无关.以下示例使用了流行的基于Transformer的方法:

This actualy depends on the way how you're writing a document to a file and has nothing to do with DOM itself. The following example uses popular Transformer-based approach:

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();      
Document document = factory.newDocumentBuilder().newDocument();             
Element element = document.createElement("tag");                            
document.appendChild(element);                                              
TransformerFactory transformerFactory = TransformerFactory.newInstance();   
Transformer transformer = transformerFactory.newTransformer();              
transformer.setOutputProperty(OutputKeys.METHOD, "html");                   
DOMSource source = new DOMSource(document);                                 
StreamResult result = new StreamResult(System.out);                         
transformer.transform(source, result);                                 

它按预期输出< tag></tag> .请注意，更改输出方法还有其他副作用，例如缺少XML声明.

It outputs <tag></tag> as you're expecting. Please note, that changing the output method has other side effects, like missing XML declaration.

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