JAVA读取XML文件数据（转）

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE managers SYSTEM "manager-config.dtd"><managers>  <manager name="DBConnectionManager" >    <service>net.csdn.blog.xport.IDBConnectionManager</service>    <implementation>net.csdn.blog.xport.impl.DBConnectionManagerCommonImpl</implementation>  </manager>  <manager name="NTAccountIdendify" >        <service>net.csdn.blog.xport.IDomainIdentify</service>        <implementation>net.csdn.blog.xport.impl.DomainIdentifyImpl</implementation>  </manager></managers>


按照下面的代码读取：

// 查找以manager作为tag标记，属性中存在name且属性值为"DBConnectionManager"的// XML节点, 并返回此节点的DOM Element对象！// 类似name字段为PK值，且name="DBConnectionManager"managerElement        = XMLFileUtil.findElement(xmlDomContent.getRootElement(),                                  "manager",                                  "name",                                  "DBConnectionManager");if (managerElement != null) {  //取得Element中的implementation属性对象...  serviceImplElement = managerElement.element("implementation");  if (serviceImplElement != null) {    //取这个属性的值...    serviceImplClassString = serviceImplElement.getText();  }}


Source of XML Utility Class：

/* * @(#)XMLFileUtil.java    1.0 2004/12/20 * * Copyright 2004 Shark Wang, All rights reserved.  */ package net.csdn.blog.xport;import java.net.URL;import java.util.Iterator;import org.apache.log4j.LogManager;import org.apache.log4j.Logger;import org.dom4j.Attribute;import org.dom4j.Document;import org.dom4j.Element;import org.dom4j.io.SAXReader;/** * The <code>XmlUtil</code> class supported your code to read/write xml * data from the file. all methods in this class depend on <code>dom4j</code>. * * @author  Shark Wang * @version 1.0, 2004/12/20 * @since   Tutorial 1.0 */public class XMLFileUtil {  private static Logger logger = LogManager.getLogger(XMLFileUtil.class);  /**   * read xml content from some file, and load xml data into the   * Document object.   *   * @param filePath String   * @return Document   */  public static Document LoadXmlFile(String filePath) {    /* marked by Shark Wang     *****************************************************************       //get resolver to ignore the DTD validation       EntityResolver resolver = new EntityResolver() {           public InputSource resolveEntity(String publicId,                                            String systemId) {               return new InputSource(new StringBufferInputStream(""));           }       };       //create reader       SAXReader reader = new SAXReader();       //set reader attribute to ignore DTD validation       reader.setEntityResolver(resolver);       reader.setValidation(false);       reader.setIncludeExternalDTDDeclarations(false);       reader.setIncludeInternalDTDDeclarations(false);     *******************************************************************     */    SAXReader reader = new SAXReader();    //try to load xml data into Document object    Document doc = null;    try {      String urlString = null;      if (filePath.startsWith("/")) {        urlString = "file://" + filePath;      }      else {        urlString = "file:///" + filePath;      }      logger.debug("XML File's URL :" + urlString);      doc = reader.read(new URL(urlString));    }    catch (Exception ex) {      logger.info("Can not load " + filePath);      logger.debug(ex.getMessage(), ex);    }    //return Document object    return doc;  }  /**   * Get attribute value by name for some xml element.   *   * @param element Element   * @param attributeName String   * @return String   */  public static String getAttributeValue(Element element,                                         String attributeName) {    String attributeValue = null;    for (Iterator i = element.attributeIterator(); i.hasNext(); ) {      Attribute attribute = (Attribute) i.next();      if (attribute.getName().equals(attributeName)) {        attributeValue = (String) attribute.getData();        break;      }    }    return attributeValue;  }  public static Element findElement(Element searchedElement,                                    String targetNodePrefix,                                    String targetNodeAttributeName,                                    String targetNodeAttributeValue) {    Element elementTarget = null;    for (Iterator i = searchedElement.elementIterator(targetNodePrefix);         i.hasNext(); ) {      Element element = (Element) i.next();      String strManagerName =          XMLFileUtil.getAttributeValue(element,                                        targetNodeAttributeName);      if (strManagerName.equals(targetNodeAttributeValue)) {        elementTarget = element;        break;      }    }    return elementTarget;  }  private XMLFileUtil() {  }}