Java XML 简要读写工具

piranha

##这个工具类主要完成字符型XML的读取和把对象转换成XML的操作

工具类
package cn.net.jk.common.utils;import java.io.StringReader;import javax.xml.parsers.DocumentBuilder;import javax.xml.parsers.DocumentBuilderFactory;import javax.xml.xpath.XPath;import javax.xml.xpath.XPathConstants;import javax.xml.xpath.XPathFactory;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import org.w3c.dom.Node;import org.w3c.dom.NodeList;import org.xml.sax.InputSource;import bsh.This;import com.thoughtworks.xstream.XStream;import com.thoughtworks.xstream.io.xml.DomDriver;public class XMLHelper {private static Log logger = LogFactory.getLog(This.class); XPath xpath = null;org.w3c.dom.Document doc = null;public XMLHelper(String xmlStr) {try {DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();DocumentBuilder db = dbf.newDocumentBuilder();doc = db.parse(new InputSource(new StringReader(xmlStr)));xpath = XPathFactory.newInstance().newXPath();} catch (Exception e) {logger.error(e);}}/** * XML生成方法，可以把对象转换成XML 生成的根名称是类名 *  * @param o * @return */public synchronized static String objectToXml(Object o) {String xml = "";try {XStream xStream = new XStream(new DomDriver());xStream.alias(o.getClass().getSimpleName(), o.getClass());xml = xStream.toXML(o);} catch (Exception e) {logger.error(e);}return xml;}public String getNodeValue(String nodePath)throws Exception{String returnvalue = "";try {returnvalue=(String)xpath.evaluate(nodePath, doc, XPathConstants.STRING);} catch (Exception e) {logger.error(e);}return returnvalue;}public NodeList getNodeList(String nodeName){NodeList cusinfoList = null;try {cusinfoList=(NodeList)xpath.evaluate(nodeName, doc, XPathConstants.NODESET);} catch (Exception e) {logger.error(e);}return cusinfoList;}public String getNodeValueFromNode(String nodePath,Node node)throws Exception{try {System.out.println("node:"+node);return xpath.evaluate(nodePath, node);} catch (Exception e) {logger.error(e);}return "";}}

使用例子
//初始化工具类,XmlStr是外部传入   XMLHelper helper = new XMLHelper(XmlStr);      try {   //获取属性   System.out.println(helper.getNodeValue("/NodeCondition/nodeCode"));         //获取列表数据   NodeList nl = helper.getNodeList("/NodeCondition/contacts/cn.net.withub.smsp.orm.dc.ContactMan");      //循环获取列表中详细属性   for(int j=0;j<nl.getLength();j++){     Node node=nl.item(j);          String phoneNumber = helper.getNodeValueFromNode("phoneNumber", node);     System.out.println("phoneNumber:"+phoneNumber);}} catch (Exception e) {e.printStackTrace();}


例子XML

<NodeCondition>  <contacts>    <cn.net.withub.smsp.orm.dc.ContactMan>      <userName>a1</userName>      <userType>1</userType>      <phoneNumber>190000000</phoneNumber>    </cn.net.withub.smsp.orm.dc.ContactMan>    <cn.net.withub.smsp.orm.dc.ContactMan>      <userName>a2</userName>      <userType>3</userType>      <phoneNumber>190000003</phoneNumber>    </cn.net.withub.smsp.orm.dc.ContactMan>  </contacts>  <nodeCode>SP2001</nodeCode>  <isSpecialSned>0</isSpecialSned></NodeCondition>