java中验证日期格式

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.regex.Matcher;
import java.util.regex.Pattern;


public class DateTimeCheck {
/**
* 验证日期时间格式
* 
* @param args
*/
public static void main(String[] args) {
String checkValue = "2008-09-11 14:17:11";
DateFormat dateFormat = new SimpleDateFormat("yyyyMMdd HH:mm:ss");
Date d = null;
if (checkValue != null && !checkValue.equals("")) {
if (checkValue.split("/").length > 1) {
dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
}
if (checkValue.split("-").length > 1) {
dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
}
} else {
return;
}
try {
d = dateFormat.parse(checkValue);
System.out.println(d);
} catch (Exception e) {
System.out.println("格式错误");
return;

}

String eL = "^((\\d{2}(([02468][048])|([13579][26]))[\\-\\/\\s]?((((0?[13578])|(1[02]))[\\-\\/\\s]?((0?[1-9])|([1-2][0-9])|(3[01])))|(((0?[469])|(11))[\\-\\/\\s]?((0?[1-9])|([1-2][0-9])|(30)))|(0?2[\\-\\/\\s]?((0?[1-9])|([1-2][0-9])))))|(\\d{2}(([02468][1235679])|([13579][01345789]))[\\-\\/\\s]?((((0?[13578])|(1[02]))[\\-\\/\\s]?((0?[1-9])|([1-2][0-9])|(3[01])))|(((0?[469])|(11))[\\-\\/\\s]?((0?[1-9])|([1-2][0-9])|(30)))|(0?2[\\-\\/\\s]?((0?[1-9])|(1[0-9])|(2[0-8]))))))(\\s(((0?[0-9])|([1-2][0-9]))\\:([0-5]?[0-9])((\\s)|(\\:([0-5]?[0-9])))))?$";
Pattern p = Pattern.compile(eL);
Matcher m = p.matcher(checkValue);
boolean b = m.matches();
if (b) {
System.out.println("格式正确");
} else {
System.out.println("格式错误");
}


}
}