org.w3c.dom.Document和org.dom4j.Document常用操作

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.StringReader;
import java.io.StringWriter;
import java.io.UnsupportedEncodingException;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

/**
 * Xml工具類.
 * 
 * @author qingwu
 * @date 2013-04-26
 */
public class XmlUtils {
	
	public static String XML_HEAD = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>";
	public static String ROOT_BEIGN = "<root>";
	public static String ROOT_END   = "</root>";

	/**************************** dom4j begin ********************************/

	/**
	 * 字符串轉org.dom4j.Document.
	 * 
	 * @param xml
	 *            xml字符串
	 * @return org.dom4j.Document文檔對象
	 * @author qingwu
	 * @date 2013-6-26 上午10:00:00
	 */
	public static org.dom4j.Document strToDom4jDoc(String xml) {
		try {
			return DocumentHelper.parseText(xml);
		} catch (DocumentException e) {
			throw new CaughtException(e);
		}
	}

	/**
	 * 文件轉org.dom4j.Document.
	 * 
	 * @param fileName
	 *            以“/”開頭，根據工程項目相對路徑讀取
	 * @return org.dom4j.Document
	 * @author qingwu
	 * @date 2013-6-26 上午10:00:00
	 */
	public static org.dom4j.Document fileToDocument(String fileName) {
		InputStream is = XmlUtils.class.getResourceAsStream(fileName);
		SAXReader reader = new SAXReader();
		Document doc = null;
		try {
			doc = reader.read(is);
		} catch (DocumentException e) {
			throw new CaughtException(e);
		} finally {
			try {
				is.close();
			} catch (IOException e) {
				throw new CaughtException(e);
			}
		}
		return doc;
	}

	/**
	 * 輸入流轉org.dom4j.Document
	 * 
	 * @param is
	 *            輸入流
	 * @return org.dom4j.Document文檔對象
	 * @author qingwu
	 * @date 2013-6-26 上午10:00:00
	 */
	public static org.dom4j.Document inputStreamToDom4jDoc(InputStream is) {
		try {
			SAXReader reader = new SAXReader();
			return reader.read(is);
		} catch (DocumentException e) {
			throw new CaughtException(e);
		}
	}

	/**
	 * org.dom4j.Document轉字符串.
	 * 
	 * @param document
	 *            org.dom4j.Document文檔對象
	 * @return xml字符串
	 * @author qingwu
	 * @date 2013-6-26 上午10:00:00
	 */
	public static String docToStr(org.dom4j.Document document) {
		return document.asXML();
	}

	/**************************** dom4j end ********************************/

	/**************************** w3c begin ********************************/

	/**
	 * 字符串轉org.w3c.dom.Document.
	 * 
	 * @param xml
	 *            xml字符串
	 * @return org.dom4j.Document文檔對象
	 * @author qingwu
	 * @date 2013-6-26 上午10:00:00
	 */
	public static org.w3c.dom.Document strToW3cDoc(String xml) {
		DocumentBuilder builder;
		try {
			builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
			return builder.parse(new InputSource(new StringReader(xml)));
		} catch (ParserConfigurationException e) {
			throw new CaughtException(e);
		} catch (SAXException e) {
			throw new CaughtException(e);
		} catch (IOException e) {
			throw new CaughtException(e);
		}
	}

	/**
	 * 輸入流轉org.w3c.dom.Document.
	 * 
	 * @param is
	 *            輸入流
	 * @return org.dom4j.Document文檔對象
	 * @author qingwu
	 * @date 2013-6-26 上午10:00:00
	 */
	public static org.w3c.dom.Document inputStreamToW3cDoc(InputStream is) {
		DocumentBuilder builder;
		try {
			builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
			return builder.parse(is);
		} catch (ParserConfigurationException e) {
			throw new CaughtException(e);
		} catch (SAXException e) {
			throw new CaughtException(e);
		} catch (IOException e) {
			throw new CaughtException(e);
		}
	}

	/**
	 * org.w3c.dom.Document轉字符串.
	 * 
	 * @param document
	 *            org.dom4j.Document文檔對象
	 * @return xml字符串
	 * @author qingwu
	 * @date 2013-6-26 上午10:00:00
	 */
	public static String docToStr(org.w3c.dom.Document document) {
		String result = null;

		if (document != null) {
			StringWriter strWtr = new StringWriter();
			StreamResult strResult = new StreamResult(strWtr);
			TransformerFactory tfac = TransformerFactory.newInstance();
			try {
				javax.xml.transform.Transformer t = tfac.newTransformer();
				t.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
				t.setOutputProperty(OutputKeys.INDENT, "yes");
				t.setOutputProperty(OutputKeys.METHOD, "xml"); // xml, html,
				// text
				t.setOutputProperty(
						"{http://xml.apache.org/xslt}indent-amount", "4");
				t.transform(new DOMSource(document.getDocumentElement()),
						strResult);
			} catch (Exception e) {
				System.err.println("XML.toString(Document): " + e);
			}
			result = strResult.getWriter().toString();
			try {
				strWtr.close();
			} catch (IOException e) {
				throw new CaughtException(e);
			}
		}

		return result;
	}

	/**
	 * 獲得org.w3c.dom.Document唯一節點的文本值.
	 * 
	 * @param doc
	 *            org.w3c.dom.Document文檔對象
	 * @param nodeName
	 *            節點名稱(唯一節點)
	 * @return
	 * @author qingwu
	 * @date 2013-6-26 上午10:00:00
	 */
	public static String getNodeText(org.w3c.dom.Document doc, String nodeName) {
		return getNodeText(doc, nodeName, 0);
	}

	/**
	 * 獲得org.w3c.dom.Document指定索引節點的文本值.
	 * 
	 * @param doc
	 *            org.w3c.dom.Document文檔對象
	 * @param nodeName
	 *            節點名稱
	 * @param index
	 *            數組標誌（從0開始）
	 * @return
	 * @author qingwu
	 * @date 2013-6-26 上午10:00:00
	 */
	public static String getNodeText(org.w3c.dom.Document doc, String nodeName,
			int index) {
		NodeList node = doc.getElementsByTagName(nodeName);
		if (node.getLength() > index && node.item(index) != null) {
			return node.item(index).getTextContent();
		}
		return null;
	}

	/**
	 * 獲得org.w3c.dom.Node節點下指定nodeName節點的文本值.
	 * 
	 * @param node
	 *            org.w3c.dom.Node
	 * @param nodeName
	 *            節點名稱
	 * @return
	 * @author qingwu
	 * @date 2013-6-26 上午10:00:00
	 */
	public static String getNodeText(org.w3c.dom.Node node, String nodeName) {
		org.w3c.dom.Node childNode = getChildNode(node, nodeName);
		if (childNode != null) {
			return childNode.getTextContent();
		}
		return null;
	}

	/**
	 * 獲得org.w3c.dom.Node節點下指定nodeName節點.
	 * 
	 * @param node
	 *            org.w3c.dom.Node
	 * @param nodeName
	 *            節點名稱
	 * @return
	 * @author qingwu
	 * @date 2013-6-26 上午10:00:00
	 */
	public static org.w3c.dom.Node getChildNode(org.w3c.dom.Node node,
			String nodeName) {
		NodeList list = node.getChildNodes();
		for (int i = 0; i < list.getLength(); i++) {
			if (list.item(i).getNodeName().equals(nodeName)) {
				return list.item(i);
			}
		}
		return null;
	}

	/**************************** w3c end ********************************/

	/**
	 * 格式化XML字符串(utf-8編碼).
	 * 
	 * @param xmlMsg
	 * @return
	 */
	public static String formatXml(String xmlMsg) {
		return formatXml(xmlMsg, null);
	}

	/**
	 * 格式化XML字符串.
	 * 
	 * @param xmlMsg
	 * @param encoding
	 * @return
	 */
	public static String formatXml(String xmlMsg, String encoding) {
		org.dom4j.Document _document = strToDom4jDoc(xmlMsg);
		String paramXML = "";
		if (encoding == null) {
			encoding = "utf-8";
		}
		try {
			OutputFormat format = OutputFormat.createPrettyPrint();
			format.setEncoding(encoding);
			ByteArrayOutputStream out = new ByteArrayOutputStream();
			XMLWriter writer = new XMLWriter(out, format);
			writer.write(_document);
			writer.flush();
			writer.close();
			paramXML = out.toString(format.getEncoding());
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return paramXML;
	}

}