java判断服务器是那种，例如区分tomcat和weblogic

下面是服务器类型探测的类，原理就是用每个应用服务器自己独特的启动类来判断

package com.roger.query.util;
import org.apache.log4j.Logger;
/**
 * @  服务器类型探测
 * @Date  2011/04/13
 * **/
public class ServerUtil {
 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() {
  ServerUtil sd = _instance;
  if (sd._serverId == null) {
   if (ServerUtil.isGeronimo()) {
    sd._serverId = "geronimo";
   } else if (ServerUtil.isJBoss()) {
    sd._serverId = "jboss";
   } else if (ServerUtil.isJOnAS()) {
    sd._serverId = "jonas";
   } else if (ServerUtil.isOC4J()) {
    sd._serverId = "oc4j";
   } else if (ServerUtil.isOrion()) {
    sd._serverId = "orion";
   } else if (ServerUtil.isResin()) {
    sd._serverId = "resin";
   } else if (ServerUtil.isWebLogic()) {
    sd._serverId = "weblogic";
   } else if (ServerUtil.isWebSphere()) {
    sd._serverId = "websphere";
   }
   if (ServerUtil.isJetty()) {
    if (sd._serverId == null) {
     sd._serverId = "jetty";
    } else {
     sd._serverId += "-jetty";
    }
   } else if (ServerUtil.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() {
  ServerUtil 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() {
  ServerUtil 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() {
  ServerUtil 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() {
  ServerUtil 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() {
  ServerUtil 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() {
  ServerUtil 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() {
  ServerUtil 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() {
  ServerUtil 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() {
  ServerUtil 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() {
  ServerUtil 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() {
  ServerUtil 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() {
  ServerUtil 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() {
  ServerUtil 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() {
  ServerUtil 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 ServerUtil() {
 }
 private static Logger _log = Logger.getLogger(ServerUtil.class);
 private static ServerUtil _instance = new ServerUtil();
 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;   
 
}