Date of issue

database Stored in the database date format string for 20131203
but the page needs to display yyyy-MM-dd HH: mm: ss format
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	public static void main(String[] args) throws Exception {
  		String date = "20131203";
  		DateFormat df = new SimpleDateFormat("yyyyMMdd");
  		Date d = df.parse(date);
  		df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
  		String newDate = df.format(d);
  		System.out.println(newDate);
  	}

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Date date = new SimpleDateFormat (" yyyy-MM-dd HH: mm: ss "). parse (" 20131203 ");
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20131203 inside the database you no hours minutes and seconds . Your front display yyyy-MM-dd bar
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final format must also be of type String

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required date conversion , specifically forgotten.
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in the database conversion easier

TO_CHAR (TO_DATE ('20131203 ',' YYYYMMDD '),' YYYY-MM-DD HH24: MI: SS ')
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if it is fixed yyyyMMdd eight string , then string concatenation direct interception not on the line

  public static String test3(String str){
  	StringBuffer sb = new StringBuffer(str);
  	sb.insert(6, "-");
  	sb.insert(4, "-");
  	sb.append(" 00:00:00");
  	return sb.toString();
  }
  

or sql query when splicing
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database should be how to write it : I put the database code stickers out :
select date
from t_user
should be added to any place


Also you can control in the page ?

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this does not work , the database may change
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that you still enumerate all instances it, if the database is not yyyyMMdd is MM -dd- yyyy Year day and so on all kind of situation is not dealt with all the wonderful work , keep it at least have a fixed rule it