Java XML Dom解析工具

缩进等

transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "no");

transformer.setOutputProperty(OutputKeys.INDENT, "yes");

transformer.setOutputProperty(OutputKeys.STANDALONE, "yes");

transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");

从其他的Document中引入Element

有时会有需求，要从其他的Xml中读取某些节点，添加到当前Xml中，只需要使用 Document.importNode

Document source = XmlUtil.load("1.xml"), target = XmlUtil.getDocumentBuilder().newDocument();

Element node = source.getDocumentElement();

Node imported = target.importNode(node, true);

引入Element时 处理namespace

如果引入节点的命名空间和当前不同，需要处理命名空间问题

XmlUtil.renameNamespaceRecursive(imported, "http://fuckingday.com");

工具类

package org.go;

import java.io.FileInputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.StringWriter;

import java.io.Writer;

import javax.xml.parsers.DocumentBuilder;

import javax.xml.parsers.DocumentBuilderFactory;

import javax.xml.parsers.ParserConfigurationException;

import javax.xml.transform.OutputKeys;

import javax.xml.transform.Transformer;

import javax.xml.transform.TransformerException;

import javax.xml.transform.TransformerFactory;

import javax.xml.transform.dom.DOMSource;

import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Document;

import org.w3c.dom.Node;

import org.w3c.dom.NodeList;

import org.xml.sax.SAXException;

public class XmlUtil {

public static DocumentBuilder getDocumentBuilder() {

DocumentBuilder parser = null;

try {

DocumentBuilderFactory df = DocumentBuilderFactory.newInstance();

df.setNamespaceAware(true);

parser = df.newDocumentBuilder();

return parser;

} catch (ParserConfigurationException e) {

e.printStackTrace();

}

return null;

}

public static Document load(String filePath) throws SAXException, IOException {

DocumentBuilder parser = getDocumentBuilder();

InputStream in = new FileInputStream(filePath);

Document document = parser.parse(in);

return document;

}

public static void toFile(Document doc, String file) throws TransformerException {

TransformerFactory tf = TransformerFactory.newInstance();

Transformer transformer = tf.newTransformer();

transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "no");

transformer.setOutputProperty(OutputKeys.INDENT, "yes");

transformer.setOutputProperty(OutputKeys.STANDALONE, "yes");

transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");

transformer.transform(new DOMSource(doc), new StreamResult(file));

}

public static String toString(Document doc) throws TransformerException {

TransformerFactory tf = TransformerFactory.newInstance();

Transformer transformer = tf.newTransformer();

transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "no");

transformer.setOutputProperty(OutputKeys.INDENT, "yes");

transformer.setOutputProperty(OutputKeys.STANDALONE, "yes");

transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");

Writer writer = new StringWriter();

transformer.transform(new DOMSource(doc), new StreamResult(writer));

return writer.toString();

}

public static void renameNamespaceRecursive(Node node, String namespace)

{

Document document = node.getOwnerDocument();

if (node.getNodeType() == Node.ELEMENT_NODE)

{

document.renameNode(node, namespace, node.getNodeName());

}

NodeList list = node.getChildNodes();

for (int i = 0; i < list.getLength(); ++i)

{

renameNamespaceRecursive(list.item(i), namespace);

}

}

}