!!!log4j 設定

!log4j.properties 設定例
 ### Stdout ###
 log4j.appender.stdout=org.apache.log4j.ConsoleAppender
 log4j.appender.stdout.Target=System.out
 log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
 log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MMM-dd HH:mm:ss} %5p - %m%n
 
 ### DailyRolling Log ###
 log4j.appender.dailyfile=org.apache.log4j.DailyRollingFileAppender
 log4j.appender.dailyfile.File=c:/Program Files/eclipse3.1/workspace/fugitive/log/fugitive.log
 log4j.appender.dailyfile.DatePattern='.'yyyy-MM-dd 
 log4j.appender.dailyfile.layout=org.apache.log4j.PatternLayout
 log4j.appender.dailyfile.layout.ConversionPattern=%d{yyyy-MMM-dd HH:mm:ss} %5p - %m%n
 
 ### Rolling Log ###
 log4j.appender.rollfile=org.apache.log4j.RollingFileAppender
 log4j.appender.rollfile.File=c:/Program Files/eclipse3.1/workspace/fugitive/log/fugitive.log
 log4j.appender.rollfile.MaxFileSize=5MB 
 log4j.appender.rollfile.MaxBackupIndex=5
 log4j.appender.rollfile.layout=org.apache.log4j.PatternLayout
 log4j.appender.rollfile.layout.ConversionPattern=%d{yyyy-MMM-dd HH:mm:ss} %5p - %m%n
 
 ### Logger Setting (for debugging)  ###
 #log4j.rootLogger=debug,stdout,rollfile
 #log4j.logger.info.typea.testApp=debug,stdout,rollfile
 
 ### Logger Setting  ###
 log4j.logger.info.typea.testApp=info,rollfile
 
!設定ファイルを指定する

http://www.nurs.or.jp/~sug/soft/log4j/log4j3.htm

::プログラム上で、明示的にプロパティファイルを指定するためのクラス。
 import java.util.Properties;
 import org.apache.log4j.Logger;
 import org.apache.log4j.PropertyConfigurator;
 
 public class LogUtil {
   static {
     try {
       Properties prop = new Properties();
       String url = "/" + LogUtil.class.getPackage().getName().replaceAll("\\.", "/") 
                    + "/log4j.properties";
       prop.load(LogUtil.class.getResourceAsStream(url));
       PropertyConfigurator.configure(prop);
     } catch (Exception re) {
       re.printStackTrace();
     }
   }
   private LogUtil() {}
   /**
    * Log4Jロガーを取得する
    * @param clazz
    * @return
    */
   public static Logger getLogger(Class clazz) {
     return Logger.getLogger(clazz);
   }
 }

::使用法
 import org.apache.log4j.Logger;
 protected Logger log = LogUtil.getLogger(Dao.class);