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/*
参数pattern注意大小写:
年yyyy
月MM
日dd
时HH
分mm
秒ss
毫秒SS
*/

public static String getDateStr(Timestamp timestamp) {
    if (timestamp != null) {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd", Locale.CHINA);
        return sdf.format(timestamp);
    }

    return "";
}