dateutil.java

spring+hibernate+struts开发的校务oa系统

package com.yondor.oa.common.utils;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

public class DateUtil {
	
	  /**
     * getDateStr	get a string with format YYYY-MM-DD from a Date object
     * @param date date
     * @return String
     */
    static public String getDateStr(Date date) {
        if (date == null) {
            return "";
        }
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
        return format.format(date);
    }

    static public String getDateStrC(Date date) {
        if (date == null) {
            return "";
        }
        SimpleDateFormat format = new SimpleDateFormat("yyyy年MM月dd日");
        return format.format(date);
    }

    /**
     * getDateStr	get a string with format YYYY-MM-DD HH:mm:ss from a Date object
     * @param date date
     * @return String
     */
    static public String getDateTimeStr(Date date) {
        if (date == null) {
            return "";
        }
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        return format.format(date);
    }

    static public String getDateTimeStrC(Date date) {
        if (date == null) {
            return "";
        }
        SimpleDateFormat format = new SimpleDateFormat("yyyy年MM月dd日 HH时mm分ss秒");
        return format.format(date);
    }

    /**
     * Parses text in 'YYYY-MM-DD' format to produce a date.
     * @param s the text
     * @return Date
     * @throws ParseException
     */
    static public Date parseDate(String s) throws ParseException {
        if (s == "" || s == null) {
            return null;
        }
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
        {
            return format.parse(s);
        }
    }

    static public Date parseDateC(String s) throws ParseException {
        if (s == "" || s == null) {
            return null;
        }

        SimpleDateFormat format = new SimpleDateFormat("yyyy年MM月dd日");
        return format.parse(s);
    }

    /**
     * Parses text in 'YYYY-MM-DD' format to produce a date.
     * @param s the text
     * @return Date
     * @throws ParseException
     */
    static public Date parseDateTime(String s) throws ParseException {
        if (s == "" || s == null) {
            return null;
        }

        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        return format.parse(s);
    }

    static public Date parseDateTimeC(String s) throws ParseException {
        if (s == "" || s == null) {
            return null;
        }

        SimpleDateFormat format = new SimpleDateFormat("yyyy年MM月dd日 HH时mm分ss秒");
        return format.parse(s);
    }

    static public String format(Date date) throws ParseException {
        String datestr = "";
        if (getDateTimeStr(date).equals("")) {
            datestr = "";
        }
        else {
            datestr = getDateTimeStr(date).substring(0, 10);
        }

        return datestr;
    }
    
    /**
     * 计算两个日期相差的天数
     * @param beginDate
     * @param endDate
     * @return
     */
    static public Long compare(Date beginDate,Date endDate){
    	return new Long(endDate.getTime()-beginDate.getTime())/1000/60/60/24;
    }
}