向Java中的现有XML节点添加新属性?
我想向现有的xml节点添加属性。我不想向xml文件添加新元素(新节点),我只想添加新属性。我怎样才能做到这一点?
特别是我尝试了以下代码行:
Element process = doc.getElementsById("id"); process.setAttribute("modelgroup", "");
TransformerFactory transformerFactory = TransformerFactory.newInstance();
Transformer transformer = transformerFactory.newTransformer();
DOMSource source = new DOMSource(doc);
StreamResult result = new StreamResult(new File("C:\\Users\\Blerta\\workspaceKEPLER\\XML_to_JSON\\SampleExample.xml"));
transformer.transform(source, result);
但是我得到以下异常:
Exception in thread "main" java.lang.NullPointerException at Main.appendAttributes(Main.java:172)
at Main.displayNodes(Main.java:65)
at Main.displayNodes(Main.java:138)
at Main.main(Main.java:42)**
回答:
在DOM解析器中,这非常容易。获取您的节点,只需使用此功能。
((Element)node).setAttribute("attr_name","attr_value");
然后最后更新您的文档。像这样..
Transformer transformer = TransformerFactory.newInstance().newTransformer(); transformer.setOutputProperty(OutputKeys.INDENT, "yes");
transformer.setOutputProperty(OutputKeys.METHOD, "xml");
transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "5");
DOMSource source = new DOMSource(document);
StreamResult result = new StreamResult(new File(tablePath));
transformer.transform(source, result);
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