你如何在 Java 中保存 DOM 文档？
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How do you save DOM Document in Java?
提问by Chitresh
I am using DOMparser and XPATHto parse a my XMLfile. I have changed a value of a node in the Document Object. However when I open my XMLfile, it doesn't show me any reflection. My DOMparser code is as below :
我正在使用DOM解析器并XPATH解析我的XML文件。我已经更改了Document Object. 但是，当我打开XML文件时，它没有显示任何反射。我的DOM解析器代码如下：
private void setPortNumber(int portNumber) {
try {
Document parsedDocument = parseDocument(tempPath + "/apache-6/conf/server.xml");
XPath xPath = XPathFactory.newInstance().newXPath();
XPathExpression expr;
expr = (XPathExpression) xPath.compile("//Connector");
Object result = expr.evaluate(parsedDocument, XPathConstants.NODESET);
NodeList nodes = (NodeList) result;
for (int i = 0; i < nodes.getLength(); i++) {
Node node =nodes.item(i);
NamedNodeMap attributes = node.getAttributes();
for(int j=0; j< attributes.getLength(); j++){
String value = attributes.item(j).getNodeValue();
if(value.equals("HTTP/1.1")){
Node valueNode = attributes.item(0);
valueNode.setNodeValue(portNumber+"");
}
}
}
} catch (XPathExpressionException e) {}
}
private Document parseDocument(String xmPath) {
Document doc = null;
try {
DocumentBuilderFactory domFactory =
DocumentBuilderFactory.newInstance();
DocumentBuilder builder;
builder = domFactory.newDocumentBuilder();
doc = builder.parse(xmPath);
}catch (Exception e) {}
return doc;
}
How can I save my document after done with changes?
完成更改后如何保存我的文档？
Can anyone help me to resolve this?
谁能帮我解决这个问题？
回答by Lalchand
Here is the sample code for updating an XML file
这是用于更新 XML 文件的示例代码
try
{
DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder = docFactory.newDocumentBuilder();
Document doc = docBuilder.parse(filePath);
Node rootNode = doc.getFirstChild();//for getting the root node
String expersion="books/author";//x-path experssion
XPathFactory factory = XPathFactory.newInstance();
XPath xpath = factory.newXPath();
XPathExpression expr = xpath.compile(expersion);
Node updateNode=null;
Object result = expr.evaluate(doc, XPathConstants.NODESET);
NodeList nodes = (NodeList) result;
updateNode=nodes.item(0);
updateNode.appendChild(doc.createCDATASection("new value"));
TransformerFactory transformerFactory = TransformerFactory.newInstance();
Transformer transformer = transformerFactory.newTransformer();
DOMSource source = new DOMSource(doc);
StreamResult streamResult = new StreamResult(new File(filePath));
transformer.transform(source, streamResult);
}
catch (Exception e) {
e.printStackTrace();
}
回答by ZeissS
You could use the Transformer API to write your DOM to a stream or a file.
您可以使用 Transformer API 将 DOM 写入流或文件。
回答by adarshr
You have to transform the dom object into an XML using the transformer.
您必须使用转换器将 dom 对象转换为 XML。
http://download.oracle.com/javaee/1.4/tutorial/doc/JAXPXSLT4.html
http://download.oracle.com/javaee/1.4/tutorial/doc/JAXPXSLT4.html
