固定时间加上日，星期，或者月份

Date performtime = (Date) map.get("performtime") == null ? null : (Date) map.get("performtime");
//如果下一次执行时间大于当时时间，则跳出，不执行
Date now = new Date();
if (performtime != null && performtime.after(now)) {
     continue;
}
String performratetime=map.get("performratetime").toString();
if (performratetime.contains("日")){
    String str1=performratetime.substring(0, performratetime.indexOf(","));
    int a = Integer.parseInt(str1);
    Calendar ca = Calendar.getInstance();
    ca.setTime(performtime);
    ca.add(Calendar.DATE, a);
    performtime = ca.getTime();
} if (performratetime.contains("周")){
    String str1=performratetime.substring(0, performratetime.indexOf(","));
    int a = Integer.parseInt(str1)*7;
    Calendar ca = Calendar.getInstance();
    ca.setTime(performtime);
    ca.add(Calendar.DATE, a);
    performtime = ca.getTime();
} if (performratetime.contains("月")){
    String str1=performratetime.substring(0, performratetime.indexOf(","));
    int a = Integer.parseInt(str1);
    Calendar ca = Calendar.getInstance();
    ca.setTime(performtime);
    ca.add(Calendar.MONTH, a);
    performtime = ca.getTime();
}

固定时间加上日，星期，或者月份

原文：https://www.cnblogs.com/2048tw/p/14784110.html