时间类型转换 String，Date

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 时间类型转换 Date--->String

private Date collectTime;
private String stringDateTime;

public String getStringDateTime(){
		String dateStr = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss").format(collectTime);
		return dateStr;
}

时间类型转换 String--> Date

private Date collectTime;
private String stringDateTime;

public String getCollectTime(){
        SimpleDateFormat sdf= new SimpleDateFormat("yyyy-MM-dd");
        Date date = sdf.parse(stringDateTime);
		return date;
	}