DOM方式读取XML工具类

package com.itheima;

import java.io.IOException;
import java.lang.reflect.Method;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
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 DOM4XMLUtils {

	// 获取整个XML文件的Document
	public static Document getDocument(String path) {
		DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
		Document document = null;
		try {
			DocumentBuilder db = dbf.newDocumentBuilder();
			document = db.parse(path);
		} catch (ParserConfigurationException e) {
			throw new RuntimeException(e);
		} catch (SAXException e) {
			throw new RuntimeException(e);
		} catch (IOException e) {
			throw new RuntimeException(e);
		}
		return document;
	}

	// 更新修改后的XML文件
	public static void writer2xml(Document document, String path) {

		TransformerFactory tf = TransformerFactory.newInstance();
		try {
			Transformer ts = tf.newTransformer();
			ts.transform(new DOMSource(document), new StreamResult(path));
		} catch (TransformerConfigurationException e) {
			throw new RuntimeException(e);
		} catch (TransformerException e) {
			throw new RuntimeException(e);
		}
	}

	// 将xml文件映射成javaBean 注意 xml文件Node 不能为中文
	@SuppressWarnings({ "rawtypes", "unchecked" })
	public static Object converToBean(Class clazz, Node ele) {
		Object object = null;

		try {
			object = clazz.newInstance();
			Class[] parameterTypes = new Class[] { String.class };
			NodeList list = ele.getChildNodes();
			int len = list.getLength();
			for (int i = 0; i < len; i++) {
				try {
					Node node = list.item(i);
					String nodeName = node.getNodeName().trim();
					String nodeVal = null;
					Node valueNode = node.getFirstChild();
					if (valueNode != null) {
						nodeVal = valueNode.getNodeValue();
					}

					Object[] arguments = new Object[] { nodeVal };
					if (nodeName.length() > 0) {
						String first = nodeName.substring(0, 1);
						String last = nodeName.substring(1);
						Method method = clazz.getMethod(
								"set" + first.toUpperCase() + last,
								parameterTypes);
						method.invoke(object, arguments);
					}
				} catch (NoSuchMethodException e) {
				}
			}
			return object;
		} catch (Exception e) {
			return null;
		}
	}
}