如何用Java保存DOM文档?
我正在使用如何用Java保存DOM文档?,java,xml,dom,xpath,document,Java,Xml,Dom,Xpath,Document,我正在使用DOM解析器和XPATH解析我的XML文件。我已更改了文档对象中节点的值。但是,当我打开XML文件时,它不会显示任何反射。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 =
DOM
解析器和XPATH
解析我的XML
文件。我已更改了文档对象
中节点的值。但是,当我打开XML
文件时,它不会显示任何反射。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;
}
private void setPortNumber(int-portNumber){
试一试{
Document parsedDocument=parseDocument(tempPath+“/apache-6/conf/server.xml”);
XPath=XPathFactory.newInstance().newXPath();
xpathexpressionexpr;
expr=(XPathExpression)xPath.compile(“//连接器”);
Object result=expr.evaluate(parsedDocument,XPathConstants.NODESET);
节点列表节点=(节点列表)结果;
对于(int i=0;i
更改完成后如何保存文档
有人能帮我解决这个问题吗?您可以使用Transformer API将DOM写入流或文件。您必须使用Transformer将DOM对象转换为XML
以下是更新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();
}