org.slf4j.Loggerでのinfo()メソッドの使用
public void info(String format, Object argArray[])
{
if(logger.isInfoEnabled())
{
FormattingTuple ft = MessageFormatter.arrayFormat(format, argArray);
logger.log(FQCN, Level.INFO, ft.getMessage(), ft.getThrowable());
}
}
使用例1:
private final Logger log = LoggerFactory.getLogger(getClass());
log.info("backlog={}", new Object[]{backlog});//backlog Java , toString()
出力は次のとおりです.
backlog=Backlog [backlogId=null, employeeId=36, backlogHead=Test, backlogBody= :2016-10-1, : , createDate=Tue Nov 01 16:44:03 CST 2016, scheduledDate=Mon Feb 01 16:44:03 CST 2016]
使用例2:
private final Logger log = LoggerFactory.getLogger(getClass());
log.info("add Backlog -> employeeId={}, backlogHead={}, scheduledDate={}", new Object[]{
backlog.getEmployeeId(), backlog.getBacklogHead(), backlog.getScheduledDate()});
出力は次のとおりです.
add Backlog -> employeeId=36, backlogHead=Test, scheduledDate=Mon Feb 01 16:44:03 CST 2016]
public void info(String msg)
{
logger.log(FQCN, Level.INFO, msg, null);
}
使用例1:
log.info("backlog=" + backlog);
出力結果:
backlog=Backlog [backlogId=null, employeeId=36, backlogHead=Test, backlogBody= :2016-10-1, : , createDate=Tue Nov 01 16:44:03 CST 2016, scheduledDate=Mon Feb 01 16:44:03 CST 2016]
public void info(String format, Object arg)
{
if(logger.isInfoEnabled())
{
FormattingTuple ft = MessageFormatter.format(format, arg);
logger.log(FQCN, Level.INFO, ft.getMessage(), ft.getThrowable());
}
}
使用例1:
log.info("delete backlog -> backlogId={}", backlogId);
出力は次のとおりです.
delete backlog -> backlogId=69
まとめ:2番目のパラメータがObjectの場合、1番目のStringパラメータには「{}」が対応し、Object[]配列の場合、配列にはいくつかのオブジェクトがあり、前のStringパラメータにはいくつかの{}カッコが対応します.