A class for reading XML file content
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 .*; /**
* title: Read XML file information
* description: get the configuration information from the xml configuration file. Excerpt form JDOM.
* copyright: copyright (c) 2004
* company: harmonious
* @ author tzl
* @ version 1.0
*/ public class xmlreader {
/*
# Set the root output configuration in the format of "info [22:35:30] [name] LOGNAME (B. c) [Line] 86 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 = %-5 p [% 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 be read. </Font>
*/
Public xmlreader (string xmlfile ){
M_webapppath = NULL;
Try {
Patternlayout layout = new patternlayout ("%-5 p % 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 during xmlreader Construction:" + ex. tostring ());
}
Catch (jdomexception ex1 ){
Log. Error ("XML file analysis error during 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/xmlconfig/config. xml under the root directory of the published application. </Font>
* @ Param servletobj <font color = "steelblue"> An httpservlet object. </Font>
*/
Public xmlreader (httpservlet servletobj ){
M_webapppath = servletobj. getservletcontext (). getrealpath ("/");
String configfilename = m_webapppath + "xmlconfig/config. xml "; Try {
Patternlayout layout = new patternlayout ("%-5 p % 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 during xmlreader construction (/xmlconfig/config. XML):" + ex. tostring ());
}
Catch (jdomexception ex1 ){
Log. Error ("XML file analysis error during xmlreader construction (/xmlconfig/config. XML):" + ex1.tostring ());
}
Catch (exception ex ){
Log. Error ("xmlreader construction error (/xmlconfig/config. XML):" + ex. tostring ());
}
} /**
* <Font color = "orange"> the absolute path root directory where the web application is published on the Web server. A directory delimiter is provided. </Font>
* @ Return <font color = "tomato"> returns the root directory of the absolute path where the web application is published on the Web server. </Font>
*/
Public String getwebapppath (){
Return m_webapppath;
} /**
* <Font color = "orange"> obtain the configuration information from the configuration file. </Font>
* @ Param key <font color = "steelblue"> name of the configuration to be obtained. </Font>
* @ Param currootname <font color = "steelblue"> the name of the Start Node to be searched. If it is null, It is searched from the root. </Font>
* @ Return <font color = "tomato"> the configured string. </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 the node by name. SPAN traversal and recursive calling. </Font>
* @ Param nodename <font color = "steelblue"> name of the node. </Font>
* @ Param curroot <font color = "steelblue"> Start node from which the query starts. If it is null, start from the root node. </Font>
* @ Return <font color = "tomato"> return the first node found under the specified node. If no value is returned, null is 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 = nestelements. iterator ();
While (iterator. hasnext () & null = retelement ){
Retelement = getelement (element) iterator. Next (), nodename );
}
}
} Return retelement;
} /**
* <Font color = "orange"> obtain the attributes of a specified node. </Font>
* @ Param elementname <font color = "steelblue"> name of the node. </Font>
* @ Param attname <font color = "steelblue"> name of the property to be obtained. </Font>
* @ Return <font color = "tomato"> value of the property to be searched. </Font>
*/
Public String getelementatrriname (string elementname, string attname)
{
Element El = getelement (null, elementname );
If (null = El)
Return NULL; Return El. getattributevalue (attname );
} } |
