日期格式化工具类DateFormat

import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Date;public class DateFormat {/** * Date转换成固定格式 * @param date  * @param pattern(yyyy-MM-dd HH:mm:ss) * @return  String */public static String dateToString(Date date, String pattern) {return new SimpleDateFormat(pattern).format(date);}// String--->Date/** * String转换成Date * @param str "2012-12-20" * @param pattern "yyyy-MM-dd HH:mm:ss" * @return  Date */public static Date stringToDate(String str,String pattern){Date date = null;try {SimpleDateFormat sdf = new SimpleDateFormat(pattern);date=sdf.parse(str.trim());} catch (ParseException e) {e.printStackTrace();}return date;}}