條件：
date_range作業日期範圍
10一週內
20兩週內
30一個月內
40一個月之後

程式碼：
private SimpleDateFormat sqlsdf = new SimpleDateFormat("yyyy-MM-dd");

public String queryDateCond(int i) {
Calendar cal = Calendar.getInstance();
cal.add(Calendar.DAY_OF_YEAR, i);
return sqlsdf.format(cal.getTime());
}

PS:
DAY_OF_MONTH當月的第幾天，從1開始
DAY_OF_WEEK返回周幾 ，返回只是Calendar定義的 SUNDAY,
 MONDAY, TUESDAY, WEDNESDAY,
 THURSDAY, FRIDAY, and SATURDAY.
DAY_OF_YEAR當年的第幾天，從1開始
具體看jdk中Calendar的類文件

String where = " o.status = 10 o.expire_date";
Date now = new Date();

if (dateRange == 10)
where = where + " <= '" + queryDateCond(7) + "' AND o.expire_date > '" + queryDateCond(-1) + "'";
if (dateRange == 20)
where = where + " <= '" + queryDateCond(14) + "' AND o.expire_date > '" + queryDateCond(-1) + "'";
if (dateRange == 30)
where = where + " <= '" + queryDateCond(31) + "' AND o.expire_date > '" + queryDateCond(-1) + "'";
if (dateRange == 40)
where = where + " > '" + queryDateCond(31) + "'";