如何在Java中保存DOM文档? [英] How do you save DOM Document in Java?
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问题描述
我正在使用 DOM
解析器和 XPATH
来解析我的 XML
文件。我已经在文档对象
中更改了一个节点的值。但是当我打开我的 XML
文件时,它不会显示任何反映。我的 DOM
解析器代码如下:
I am using DOM
parser and XPATH
to parse a my XML
file. I have changed a value of a node in the Document Object
. However when I open my XML
file, it doesn't show me any reflection. My DOM
parser code is as below :
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;
}
完成更改后如何保存我的文档?
How can I save my document after done with changes?
有人可以帮我解决吗?
推荐答案
以下是更新示例代码一个XML文件
Here is the sample code for updating an XML file
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();
}
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