JS 判断当前时间是上午还是下午等

 Calendar cal = Calendar.getInstance();

 int hour = cal.get(Calendar.HOUR_OF_DAY);

 if (hour >= 6 && hour < 8) {

  out.print("早上好");

 } else if (hour >= 8 && hour < 11) {

  out.print("上午好");

 } else if (hour >= 11 && hour < 13) {

  out.print("中午好");

 } else if (hour >= 13 && hour < 18) {

  out.print("下午好");

 } else {

  out.print("晚上好");

 }