String into Date type of problem

previously Date date = new Date (Str s) s can be converted to Date type.
now also be specified with Simpledateformat style : If Simpledateformat ss = new Simpledateformat ("yyyy-MM-dd HH: mm: ss") Date type to turn through the parse.
But there is a problem, I wanted to write a utility class , I do not know what kind of style the incoming string , how to convert Date types? Seek expert advice ah
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not. . .
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fully automatic is not possible, the regular expression can be specified in several formats that can be entered and then determine the conversion
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exhaustive of all types , according to the passed parameter types to match to type conversion .
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pass two parameters can write a utility class , such as:

  public static Date toDateSafely(String simpleType,String stringDate){
  		try{
  			SimpleDateFormat dateFormat = new SimpleDateFormat(simpleType); 
  		    return dateFormat.parse(stringDate); 
  		}catch(Exception e){
  			return null;
  		}
  	}
  
  

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commons there DateUtils can
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make a sauce just 22
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  	/**
  	 * String 转 Date
  	 * auther: shijing
  	 * 2014-5-9下午03:16:14
  	 * @param str
  	 * @param format
  	 * @return
  	 */
  	public static Date string2Date(String str, String format) {
  		DateFormat dateFormat = new SimpleDateFormat(format);
  		Date date = null;
  		try {
  			date = dateFormat.parse(str);
  		}
  		catch (ParseException e) {
  			e.printStackTrace();
  		}
  		return date;
  	}

This is what I often write DateUtils One way
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uncertainty inflicted on one parameter . . .
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as exhaustive . . .
constantly try catch to try and succeed on the return, failure to continue to parse.
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  import java.text.ParseException;
  import java.text.SimpleDateFormat;
  import java.util.Date;
  
  public class Test3 {
  	public static Date parseDate(String time) {
  		String pattern = "";
  		if (time.contains("-")) {
  			pattern += "yyyy-MM-dd";
  		} else if (time.contains("年")) {
  			pattern += "yyyy年MM月dd日";
  		}
  		if (time.contains("上午") || time.contains("下午")) {
  			if (!pattern.equals("")) {
  				pattern += " ";
  			}
  			pattern += "a";
  		}
  		if (time.contains(":")) {
  			if (!pattern.equals("")) {
  				pattern += " ";
  			}
  			pattern += "HH:mm:ss";
  		}
  		try {
  			return new SimpleDateFormat(pattern).parse(time);
  		} catch (ParseException e) {
  			e.printStackTrace();
  			return null;
  		}
  	}
  
  	public static void main(String[] args) {
  		System.out.println(parseDate("2014-05-26 下午 16:22:13"));
  		System.out.println(parseDate("2014-05-26"));
  		System.out.println(parseDate("16:22:13"));
  		System.out.println(parseDate("2014-05-26 16:22:13"));
  		System.out.println(parseDate("2014年05月26日 16:22:13"));
  	}
  }
  

basic common no problem
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lazy to have boundaries. . Unless you know your format is fixed and that several, and then one by one to try , otherwise it is impossible to have a universal method 01/02/2014
For example , the format does not tell you , how do you know this is February 1 , or January 2 ? Both formats are very common format , so I can not judge
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For example, I now have two strings

		String input1="2014-05-23 09:23:33";
  		String input2="2014-05-23 上午09:23:33";

how to put them into a Date type ,
with SimpleDateFormat dateFormat = new SimpleDateFormat ("yyyy-MM-dd HH: mm: ss"); input1 can only turn one way how to write as much as possible . match many styles , or what can be achieved?
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able to write a simple example ?
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en, yes, but every time you call this method must know what form stringDate time string to the corresponding rid simpleType. lazy I think the point is , I do not have to care about what it was like passed in stringDate , give me time to turn on the type of good
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Thank you join , knot posted . No wonder, then ah unequal share