📄 一个读取xml文件内容的类.htm
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<td height="36" align="center" valign="middle" bgcolor="#FFFFFF" style="word-break:break-all" class="title"><strong>一个读取xml文件内容的类</strong></td>
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<td height="40" align="right" valign="middle" bgcolor="#FFFFFF" style="word-break:break-all">作者：Javazealot
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<td height="623" align="left" valign="top" class="content">一个读取xml文件内容的类 <br>package project.util.xml;<br><br>import java.io.*;<br>import java.util.*;<br>import javax.servlet.http.*;<br>import org.apache.log4j.*;<br>import org.jdom.*;<br>import org.jdom.input.*;<br><br>/**<br>* <p>Title: <font color="steelblue" size="10">读取xml文件信息</font></p><br>* <p>Description: <font color="steelblue">从XML配置文件中获得配置信息。excerpt form jdom。</font></p><br>* <p>Copyright: <font color="steelblue">Copyright (c) 2004</font></p><br>* <p>Company: <font color="steelblue">Harmonious</font></p><br>* @author <font color="steelblue">TZL</font><br>* @version <font color="steelblue">1.0</font><br>*/<br><br>public class XMLReader {<br>/*<br>#设置根的输出配置，格式为 "info [2004-05-01 22:35:30] [name]logname(b.c) [line] 86 msg-->log信息"<br>log4j.rootLogger=DEBUG, rootAppender<br>log4j.appender.rootAppender=org.apache.log4j.RollingFileAppender<br>log4j.appender.rootAppender.File=e:/MapXtremeSmpl.log<br>log4j.appender.rootAppender.MaxFileSize=1000KB<br>log4j.appender.rootAppender.layout=org.apache.log4j.PatternLayout<br>log4j.appender.rootAppender.layout.ConversionPattern=%-5p [%d{yyyy-mm-dd HH:mm:ss}] [name] %c{2} [line] %L msg--> %m%n<br>*/<br>static public Logger log = Logger.getLogger(XMLReader.class);<br>protected Element m_RootElement = null;<br>protected String m_webAppPath = null;<br><br>/**<br>* <font color="orange">构造函数。</font><br>* @param xmlFile <font color="steelblue">要读取的配置文件的绝对路径。</font><br>*/<br>public XMLReader(String xmlFile) {<br>m_webAppPath = null;<br>try {<br>PatternLayout layout = new PatternLayout("%-5p %d{yyyy-MM-dd HH:mm:ss} [name] %c{2} [line] %L [msg] %m%n");<br>ConsoleAppender appender = new ConsoleAppender(/*new SimpleLayout(),*/layout, "System.err");<br>log.addAppender(appender);<br><br>SAXBuilder builder = new SAXBuilder();<br>document．nbspdoc = null;<br>doc = builder.build(new FileInputStream(xmlFile));<br>m_RootElement = doc.getRootElement();<br>}<br>catch (IOException ex) {<br>log.error("XMLReader构造时出现IO错误:" + ex.toString());<br>}<br>catch (JDOMException ex1) {<br>log.error("XMLReader构造时分析XML文件出错:" + ex1.toString());<br>}<br>catch (Exception ex) {<br>log.error("XMLReader 构造出错:" + ex.toString());<br>}<br>}<br><br>/**<br>* <font color="orange">构造函数。配置文件必须指定为发布的应用的根目录下的/XmlConfig/Config.xml。</font><br>* @param servletObj <font color="steelblue">随便一个HttpServlet对象。</font><br>*/<br>public XMLReader(HttpServlet servletObj) {<br>m_webAppPath = servletObj.getServletContext().getRealPath("/");<br>String configFileName = m_webAppPath + "XmlConfig/Config.xml";<br><br>try {<br>PatternLayout layout = new PatternLayout("%-5p %d{yyyy-MM-dd HH:mm:ss} [name] %c{2} [line] %L [msg] %m%n");<br>ConsoleAppender appender = new ConsoleAppender( /*new SimpleLayout(),*/layout, "System.err");<br>log.addAppender(appender);<br><br>SAXBuilder builder = new SAXBuilder();<br>document．nbspdoc = null;<br>doc = builder.build(new FileInputStream(configFileName));<br>m_RootElement = doc.getRootElement();<br>}<br>catch (IOException ex) {<br>log.error("XMLReader构造时出现IO错误（/XmlConfig/Config.xml）:" + ex.toString());<br>}<br>catch (JDOMException ex1) {<br>log.error("XMLReader构造时分析XML文件出错（/XmlConfig/Config.xml）:" + ex1.toString());<br>}<br>catch (Exception ex) {<br>log.error("XMLReader构造出错（/XmlConfig/Config.xml）:" + ex.toString());<br>}<br>}<br><br>/**<br>* <font color="orange">web应用发布在web服务器的绝对路径根目录，最后已经有目录分割符。</font><br>* @return <font color="tomato">返回web应用发布在web服务器的绝对路径的根目录。</font><br>*/<br>public String getWebAppPath() {<br>return m_webAppPath;<br>}<br><br>/**<br>* <font color="orange">从配置文件中获得配置信息。</font><br>* @param key <font color="steelblue">要获取的配置名称。</font><br>* @param curRootName <font color="steelblue">查找的起始节点名称，如果为null从根开始查找。</font><br>* @return <font color="tomato">配置的字符串。</font><br>*/<br>public String getElementvalue(String curRootName, String key) {<br>String value = null;<br>Element curRoot = getElement(null, curRootName);<br>if (null == curRoot) {<br>curRoot = m_RootElement;<br>}<br>Element keyNode = getElement(curRoot, key);<br>if (null != keyNode) {<br>value = keyNode.getTextTrim();<br><br>}<br>return value;<br>}<br><br>/**<br>* <font color="orange">根据名字获得节点。广度遍历，递归调用。</font><br>* @param nodeName <font color="steelblue">节点的名字。</font><br>* @param curRoot <font color="steelblue"> 从开始查找的起始节点，如果为null从根开始查找。</font><br>* @return <font color="tomato">返回从指定节点下找到的第一个节点。如果没有返回null。</font><br>*/<br>private Element getElement(Element curRoot, String nodeName) {<br>Element retElement = null;<br><br>if (null == nodeName)<br>return m_RootElement;<br><br>if (null == curRoot) {<br>curRoot = m_RootElement;<br>}<br><br>if (null != curRoot) {<br>retElement = curRoot.getChild(nodeName);<br>if (null == retElement) {<br>List nestElements = curRoot.getChildren();<br>Iterator iterator = nestElements.iterator();<br>while (iterator.hasNext() && null == retElement) {<br>retElement = getElement( (Element) iterator.next(), nodeName);<br>}<br>}<br>}<br><br>return retElement;<br>}<br><br>/**<br>* <font color="orange">获得指定节点的属性。</font><br>* @param elementName <font color="steelblue">节点的名称。</font><br>* @param attName <font color="steelblue">要获得的属性的名称。</font><br>* @return <font color="tomato">要查找的属性的值。</font><br>*/<br>public String getElementAtrribute(String elementName, String attName)<br>{<br>Element el = getElement(null, elementName);<br>if (null == el)<br>return null;<br><br>return el.getAttributevalue(attName);<br>}<br><br>}</td>
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