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);

		}

	}

}