程序中判断应用服务器部类

import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;public class ServerDetector {	public static final String GERONIMO_CLASS =		"/org/apache/geronimo/system/main/Daemon.class";	public static final String JBOSS_CLASS = "/org/jboss/Main.class";	public static final String JETTY_CLASS = "/org/mortbay/jetty/Server.class";	public static final String JONAS_CLASS =		"/org/objectweb/jonas/server/Server.class";	public static final String OC4J_CLASS =		"/oracle/jsp/oc4jutil/Oc4jUtil.class";	public static final String ORION_CLASS =		"/com/evermind/server/ApplicationServer.class";	public static final String PRAMATI_CLASS = "/com/pramati/Server.class";	public static final String RESIN_CLASS =		"/com/caucho/server/resin/Resin.class";	public static final String REXIP_CLASS = "/com/tcc/Main.class";	public static final String SUN7_CLASS =		"/com/iplanet/ias/tools/cli/IasAdminMain.class";	public static final String SUN8_CLASS =		"/com/sun/enterprise/cli/framework/CLIMain.class";	public static final String TOMCAT_CLASS =		"/org/apache/catalina/startup/Bootstrap.class";	public static final String WEBLOGIC_CLASS = "/weblogic/Server.class";	public static final String WEBSPHERE_CLASS =		"/com/ibm/websphere/product/VersionInfo.class";	public static String getServerId() {		ServerDetector sd = _instance;		if (sd._serverId == null) {			if (ServerDetector.isGeronimo()) {				sd._serverId = "geronimo";			}			else if (ServerDetector.isJBoss()) {				sd._serverId = "jboss";			}			else if (ServerDetector.isJOnAS()) {				sd._serverId = "jonas";			}			else if (ServerDetector.isOC4J()) {				sd._serverId = "oc4j";			}			else if (ServerDetector.isOrion()) {				sd._serverId = "orion";			}			else if (ServerDetector.isResin()) {				sd._serverId = "resin";			}			else if (ServerDetector.isWebLogic()) {				sd._serverId = "weblogic";			}			else if (ServerDetector.isWebSphere()) {				sd._serverId = "websphere";			}			if (ServerDetector.isJetty()) {				if (sd._serverId == null) {					sd._serverId = "jetty";				}				else {					sd._serverId += "-jetty";				}			}			else if (ServerDetector.isTomcat()) {				if (sd._serverId == null) {					sd._serverId = "tomcat";				}				else {					sd._serverId += "-tomcat";				}			}			if (_log.isInfoEnabled()) {				_log.info("Detected server " + sd._serverId);			}			if (sd._serverId == null) {				throw new RuntimeException("Server is not supported");			}		}		return sd._serverId;	}	public static boolean isGeronimo() {		ServerDetector sd = _instance;		if (sd._geronimo == null) {			Class c = sd.getClass();			if (c.getResource(GERONIMO_CLASS) != null) {				sd._geronimo = Boolean.TRUE;			}			else {				sd._geronimo = Boolean.FALSE;			}		}		return sd._geronimo.booleanValue();	}	public static boolean isJBoss() {		ServerDetector sd = _instance;		if (sd._jBoss == null) {			Class c = sd.getClass();			if (c.getResource(JBOSS_CLASS) != null) {				sd._jBoss = Boolean.TRUE;			}			else {				sd._jBoss = Boolean.FALSE;			}		}		return sd._jBoss.booleanValue();	}	public static boolean isJetty() {		ServerDetector sd = _instance;		if (sd._jetty == null) {			Class c = sd.getClass();			if (c.getResource(JETTY_CLASS) != null) {				sd._jetty = Boolean.TRUE;			}			else {				sd._jetty = Boolean.FALSE;			}		}		return sd._jetty.booleanValue();	}	public static boolean isJOnAS() {		ServerDetector sd = _instance;		if (sd._jonas == null) {			Class c = sd.getClass();			if (c.getResource(JONAS_CLASS) != null) {				sd._jonas = Boolean.TRUE;			}			else {				sd._jonas = Boolean.FALSE;			}		}		return sd._jonas.booleanValue();	}	public static boolean isOC4J() {		ServerDetector sd = _instance;		if (sd._oc4j == null) {			Class c = sd.getClass();			if (c.getResource(OC4J_CLASS) != null) {				sd._oc4j = Boolean.TRUE;			}			else {				sd._oc4j = Boolean.FALSE;			}		}		return sd._oc4j.booleanValue();	}	public static boolean isOrion() {		ServerDetector sd = _instance;		if (sd._orion == null) {			Class c = sd.getClass();			if (c.getResource(ORION_CLASS) != null) {				sd._orion = Boolean.TRUE;			}			else {				sd._orion = Boolean.FALSE;			}		}		return sd._orion.booleanValue();	}	public static boolean isPramati() {		ServerDetector sd = _instance;		if (sd._pramati == null) {			Class c = sd.getClass();			if (c.getResource(PRAMATI_CLASS) != null) {				sd._pramati = Boolean.TRUE;			}			else {				sd._pramati = Boolean.FALSE;			}		}		return sd._pramati.booleanValue();	}	public static boolean isResin() {		ServerDetector sd = _instance;		if (sd._resin == null) {			Class c = sd.getClass();			if (c.getResource(RESIN_CLASS) != null) {				sd._resin = Boolean.TRUE;			}			else {				sd._resin = Boolean.FALSE;			}		}		return sd._resin.booleanValue();	}	public static boolean isRexIP() {		ServerDetector sd = _instance;		if (sd._rexIP == null) {			Class c = sd.getClass();			if (c.getResource(REXIP_CLASS) != null) {				sd._rexIP = Boolean.TRUE;			}			else {				sd._rexIP = Boolean.FALSE;			}		}		return sd._rexIP.booleanValue();	}	public static boolean isSun() {		if (isSun7() || isSun8()) {			return true;		}		else {			return false;		}	}	public static boolean isSun7() {		ServerDetector sd = _instance;		if (sd._sun7 == null) {			Class c = sd.getClass();			if (c.getResource(SUN7_CLASS) != null) {				sd._sun7 = Boolean.TRUE;			}			else {				sd._sun7 = Boolean.FALSE;			}		}		return sd._sun7.booleanValue();	}	public static boolean isSun8() {		ServerDetector sd = _instance;		if (sd._sun8 == null) {			Class c = sd.getClass();			if (c.getResource(SUN8_CLASS) != null) {				sd._sun8 = Boolean.TRUE;			}			else {				sd._sun8 = Boolean.FALSE;			}		}		return sd._sun8.booleanValue();	}	public static boolean isTomcat() {		ServerDetector sd = _instance;		if (sd._tomcat == null) {			Class c = sd.getClass();			if (c.getResource(TOMCAT_CLASS) != null) {				sd._tomcat = Boolean.TRUE;			}			else {				sd._tomcat = Boolean.FALSE;			}		}		return sd._tomcat.booleanValue();	}	public static boolean isWebLogic() {		ServerDetector sd = _instance;		if (sd._webLogic == null) {			Class c = sd.getClass();			if (c.getResource(WEBLOGIC_CLASS) != null) {				sd._webLogic = Boolean.TRUE;			}			else {				sd._webLogic = Boolean.FALSE;			}		}		return sd._webLogic.booleanValue();	}	public static boolean isWebSphere() {		ServerDetector sd = _instance;		if (sd._webSphere == null) {			Class c = sd.getClass();			if (c.getResource(WEBSPHERE_CLASS) != null) {				sd._webSphere = Boolean.TRUE;			}			else {				sd._webSphere = Boolean.FALSE;			}		}		return sd._webSphere.booleanValue();	}	private ServerDetector() {	}	private static Log _log = LogFactory.getLog(ServerDetector.class);	private static ServerDetector _instance = new ServerDetector();	private String _serverId;	private Boolean _geronimo;	private Boolean _jBoss;	private Boolean _jetty;	private Boolean _jonas;	private Boolean _oc4j;	private Boolean _orion;	private Boolean _pramati;	private Boolean _resin;	private Boolean _rexIP;	private Boolean _sun7;	private Boolean _sun8;	private Boolean _tomcat;	private Boolean _webLogic;	private Boolean _webSphere;}

if(ServerDetector.isTomcat()){//tomcat server path = this.getServletContext().getRealPath("/")+"data\\"+userId+".xls";}else if(ServerDetector.isWebLogic()){//weblogic server path = this.getServletContext().getRealPath("/")  +"\\data\\"+userId+".xls";}