java转换日期的工具类

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package com.lingan.common;

import java.sql.Timestamp;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.regex.Pattern;

import org.apache.commons.lang.StringUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class DateUtils {
    private static Log log = LogFactory.getLog(DateUtils.class);
    public final static SimpleDateFormat dateMillTimeFormat = new SimpleDateFormat(
            "yyyyMMddHHmmssSSS");
    public final static SimpleDateFormat dateTimeFormat = new SimpleDateFormat(
            "yyyy-MM-dd HH:mm:ss.SSS");
    public final static java.util.regex.Pattern pattern = Pattern
            .compile("^[0-9]{4}[/-][0-9]{1,2}[/-][0-9]{1,2}( +[0-9]{2}(:[0-9]{2}(:[0-9]{2}\\.?[0-9]{0,3})?)?)?$");

    public synchronized static Date toDate(String date) {
        Date d = null;
        // 20110201==>yyyyMMdd
        // 2011/01/01==>yyyy/MM/dd
        // 2011-01-01==>yyyy-MM-dd
        try {
            if (!pattern.matcher(date).matches()) {
                throw new Exception(date+" is not a date format.");
            }
            String rdate = date.replaceAll("[/ :.-]", "");
            if (rdate.length() < 8) {
                throw new Exception();
            } else {
                while (rdate.length() < 17) {
                    rdate += "0";
                }
            }
            d = dateMillTimeFormat.parse(rdate);
        } catch (Exception e) {
            log.error(date + " 日期格式錯誤.");
        }
        return d;
    }

    public static Date toDate(Timestamp date) {
        return date;
    }

    public static Date toDate(Object date) {
        Date d = null;
        if (date instanceof Date) {
            d = (Date) date;
        } else if (date instanceof String) {
            d = toDate((String) date);
        }
        return d;
    }
    public static Timestamp toTimeStamp(Object obj){
        if (obj==null || StringUtils.isBlank(obj.toString())){
            return null;
        }
        Date date = toDate(obj);
        return new Timestamp(date.getTime());
    }
    public synchronized static String format(Date date) {
        return dateTimeFormat.format(date);
    }

    public synchronized static String format(Timestamp date) {
        return dateTimeFormat.format(date);
    }
    public static String format(Date date, String format) {
        return new SimpleDateFormat(format).format(date);
    }

    public synchronized static String format(Object date) {
        String formatDate = null;
        if (date instanceof Date) {
            formatDate = dateTimeFormat.format((Date) date);
        }
        return formatDate;
    }

    public static void main(String[] args) {
        System.out.println("1:" + DateUtils.toDate("2011"));
        System.out.println("2:" + DateUtils.toDate("2011/12/20"));
        System.out.println("3:" + DateUtils.toDate("2011/12/20 17:20:30"));
        System.out.println("4:" + DateUtils.toDate("2011/12/20 17:20"));
        System.out.println("5:"
                + DateUtils.toDate(new Timestamp(Calendar.getInstance()
                        .getTime().getTime())));
        System.out.println("6:"
                + DateUtils.format(new Timestamp(Calendar.getInstance()
                        .getTime().getTime())));

        System.out.println("10:" + DateUtils.toDate("2010/12/01"));
        System.out.println("11:" + DateUtils.toDate("2011-01-01"));

补充：软件开发 , Java ,