log4j設定

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);