Long转String
Calendar c = Calendar.getInstance();
c.setTimeInMillis(contractPurchasePoDetailVO.getGmtCreateTime());
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
excelVO.setGmtCreateTime(sdf.format(c.getTime()));
Long转String
Calendar c = Calendar.getInstance();
c.setTimeInMillis(contractPurchasePoDetailVO.getGmtCreateTime());
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
excelVO.setGmtCreateTime(sdf.format(c.getTime()));
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