A class that reads the contents of an XML file

Xml

A class that reads the contents of an XML file
Package project.util.xml;

Import java.io.*;
Import java.util.*;
Import javax.servlet.http.*;
Import org.apache.log4j.*;
Import org.jdom.*;
Import org.jdom.input.*;

/**
* <p>title: <font color= "Steelblue" size= "ten" > read XML file Information </font></p>
* <p>description: <font color= "Steelblue" > obtains configuration information from the XML configuration file. Excerpt form Jdom. </font></p>
* <p>copyright: <font color= "Steelblue" >copyright (c) 2004</font></p>
* <p>company: <font color= "Steelblue" >Harmonious</font></p>
* @author <font color= "Steelblue" >TZL</font>
* @version <font color= "Steelblue" >1.0</font>
*/

public class XMLReader {
/*
#设置根的输出配置, format "info [2004-05-01 22:35:30] [Name]logname (B.C ) [Line] Msg-->log information
Log4j.rootlogger=debug, Rootappender
log4j.appender.rootappender= Org.apache.log4j.RollingFileAppender
Log4j.appender.rootappender.file=e:/mapxtremesmpl.log
LOG4J.APPENDER.ROOTAPPENDER.MAXFILESIZE=1000KB
Log4j.appender.rootappender.layout= Org.apache.log4j.PatternLayout
log4j.appender.rootappender.layout.conversionpattern=%-5p [%d{yyyy-mm-dd hh:mm : ss}] [name]%c{2} [line]%l msg-->%m%n
*/
static public Logger log = Logger.getlogger (Xmlreader.class);
protected Element m_rootelement = null;
Protected String M_webapppath = null;

/**
* <font color= "Orange" > constructor. </font>
* @param xmlFile <font color= "Steelblue" the absolute path of the configuration file to read. </font>
*/
Public XMLReader (String xmlFile) {
M_webapppath = null;
try {
Patternlayout layout = new Patternlayout ("%-5p%d{yyyy-mm-dd HH:mm:ss} [name]%c{2} [line]%l [MSG]%m%n");
Consoleappender Appender = new Consoleappender (/*new simplelayout (), */layout, "System.err");
Log.addappender (Appender);

Saxbuilder builder = new Saxbuilder ();
Document Nbspdoc = null;
doc = Builder.build (new FileInputStream (XmlFile));
M_rootelement = Doc.getrootelement ();
}
catch (IOException ex) {
Log.error (IO Error in XmlReader construct: + ex.tostring ());
}
catch (Jdomexception Ex1) {
Log.error (Error parsing xml file at XmlReader construction: "+ ex1.tostring ());
}
catch (Exception ex) {
Log.error ("XMLReader Construction Error:" + ex.tostring ());
}
}

/**
* <font color= "Orange" > constructor. The configuration file must be specified as a/xmlconfig/config.xml under the root directory of the published application. </font>
* @param servletobj <font color= "Steelblue" > A random HttpServlet object. </font>
*/
Public XMLReader (HttpServlet servletobj) {
M_webapppath = Servletobj.getservletcontext (). Getrealpath ("/");
String configfilename = M_webapppath + "Xmlconfig/config.xml";

try {
Patternlayout layout = new Patternlayout ("%-5p%d{yyyy-mm-dd HH:mm:ss} [name]%c{2} [line]%l [MSG]%m%n");
Consoleappender Appender = new Consoleappender (/*new simplelayout (), */layout, "System.err");
Log.addappender (Appender);

Saxbuilder builder = new Saxbuilder ();
Document Nbspdoc = null;
doc = Builder.build (new FileInputStream (Configfilename));
M_rootelement = Doc.getrootelement ();
}
catch (IOException ex) {
Log.error ("IO error (/xmlconfig/config.xml) occurred while XmlReader constructs:" + ex.tostring ());
}
catch (Jdomexception Ex1) {
Error parsing xml file (/xmlconfig/config.xml) at Log.error (XmlReader): "+ ex1.tostring ());
}
catch (Exception ex) {
Log.error ("XmlReader construction Error (/xmlconfig/config.xml):" + ex.tostring ());
}
}

/**
* <font color= "Orange" >web application published in the Web server's absolute path root directory, and finally has a directory separator. </font>
* @return <font color= "Tomato" > returns the root directory where Web applications are published in the absolute path of the Web server. </font>
*/
Public String Getwebapppath () {
return m_webapppath;
}

/**
* <font color= "Orange" > Obtain configuration information from the configuration file. </font>
* @param key <font color= "Steelblue" > The name of the configuration to get. </font>
* @param currootname <font color= The start node name of the "Steelblue" > lookup, if null from the root. </font>
* @return <font color= "Tomato" > Configured strings. </font>
*/
public string Getelementvalue (string currootname, string key) {
String value = null;
Element curroot = getelement (null, currootname);
if (null = = Curroot) {
Curroot = m_rootelement;
}
Element Keynode = getelement (Curroot, key);
if (null!= keynode) {
Value = Keynode.gettexttrim ();

}
return value;
}

/**
* <font color= "Orange" > Get node by name. Breadth traversal, recursive invocation. </font>
* @param the name of the nodename <font color= "Steelblue" > node. </font>
* @param curroot <font color= "Steelblue" > The starting node from which to start the lookup, if null from the root. </font>
* @return <font color= "Tomato" > Returns the first node found under the specified node. If NULL is not returned. </font>
*/
private element GetElement (element curroot, String nodename) {
Element retelement = null;

if (null = = NodeName)
return m_rootelement;

if (null = = Curroot) {
Curroot = m_rootelement;
}

if (null!= curroot) {
Retelement = Curroot.getchild (nodename);
if (null = = Retelement) {
List nestelements = Curroot.getchildren ();
Iterator iterator = Nestelements.iterator ();
while (Iterator.hasnext () && null = = Retelement) {
Retelement = GetElement (Element) Iterator.next (), nodename);
}
}
}

return retelement;
}

/**
* <font color= "Orange" > Get the properties of the specified node. </font>
* @param elementname <font color= The name of the "Steelblue" > node. </font>
* @param attname <font color= "Steelblue" > The name of the property to be obtained. </font>
* @return <font color= "Tomato" > The value of the property to find. </font>
*/
public string Getelementatrribute (string elementname, String attname)
{
Element el = getelement (null, elementname);
if (null = = EL)
return null;

Return El.getattributevalue (AttName);
}

}