日志界别动态调整2

package ***.cbb.log;import org.apache.log4j.Level;import org.apache.log4j.Logger;import org.apache.log4j.spi.LoggerRepository;/** * 日志级别修改类，可以不停机（tomcat不需要重启）实现对日志记录级别的修改， * 并即时生效。 * @author jianfeng.lu * */public final class LogLevelChanger{  private static final Logger logger = Logger.getLogger(LogLevelChanger.class);  private static LogLevelChanger instance;  public static synchronized LogLevelChanger getInstance()  {    if (null == instance)      instance = new LogLevelChanger();    return instance;  }  public boolean changeLogLevel(String paramString)  {    if ((null == paramString) || ("".equals(paramString.trim())))    {      logger.warn("[amulog] changeLogLevel() strLevel is empty");      return false;    }    if ("Debug".equalsIgnoreCase(paramString))    {      logger.getLoggerRepository().getRootLogger().setLevel(Level.DEBUG);      return true;    }    if ("Info".equalsIgnoreCase(paramString))    {      logger.getLoggerRepository().getRootLogger().setLevel(Level.INFO);      return true;    }    if ("Warn".equalsIgnoreCase(paramString))    {      logger.getLoggerRepository().getRootLogger().setLevel(Level.WARN);      return true;    }    if ("Error".equalsIgnoreCase(paramString))    {      logger.getLoggerRepository().getRootLogger().setLevel(Level.ERROR);      return true;    }    if ("DEFAULT".equalsIgnoreCase(paramString))    {      logger.getLoggerRepository().getRootLogger().setLevel(getDefaultLogLevel());      return true;    }    logger.debug("[amulog] changeLogLevel() exit");    return false;  }  private Level getDefaultLogLevel()  {    logger.debug("[amulog] getDefaultLogLevel() enter.");    Level localLevel = null;    String str = LogMgrHelper.getInstance().getDefaultLogLevel();    if ("error".equalsIgnoreCase(str))      localLevel = Level.ERROR;    else if ("warn".equalsIgnoreCase(str))      localLevel = Level.WARN;    else if ("info".equalsIgnoreCase(str))      localLevel = Level.INFO;    else if ("debug".equalsIgnoreCase(str))      localLevel = Level.DEBUG;    else      localLevel = Level.ERROR;    logger.debug("[amulog] getDefaultLogLevel() leave.");    return localLevel;  }  public String getLogLevel()  {    String str = logger.getLoggerRepository().getRootLogger().getLevel().toString();    if ("Debug".equalsIgnoreCase(str))      str = "Debug";    if ("Info".equalsIgnoreCase(str))      str = "Info";    if ("Warn".equalsIgnoreCase(str))      str = "Warn";    if ("Error".equalsIgnoreCase(str))      str = "Error";    return str;  }}