java判断字符串是否是日期

public class StringUtil {/** * 判断字符串值是否为空 * @param value * @return */public static boolean isEmpty(String value){if(value == null || "".equals(value)){return true;}return false;}public static boolean isDate(String value,String format){SimpleDateFormat sdf = null;ParsePosition pos = new ParsePosition(0);//指定从所传字符串的首位开始解析if(value == null || isEmpty(format)){return false;}try {sdf = new SimpleDateFormat(format);sdf.setLenient(false);Date date = sdf.parse(value,pos);if(date == null){return false;}else{System.out.println("-------->pos : " + pos.getIndex());System.out.println("-------->date : " + sdf.format(date));//更为严谨的日期,如2011-03-024认为是不合法的if(pos.getIndex() > sdf.format(date).length()){return false;}return true;}} catch (Exception e) {e.printStackTrace();return false;}}public static void main(String[] args) {System.out.println(isDate("21011-02-18","yyyy-MM-dd"));}}