java工具类------日期工具类

来源：互联网发布：java文件流转文件编辑：程序博客网时间：2024/06/01 07:32

1.不多说直接上代码，小伙伴们可以看注释，代码如下：

import java.text.DateFormat;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;/** * @ClassName: DateUtil * @Description: 日期工具类 * @author wangXi * @date  */public class DateUtil{    /**     * @Title: formatDate     * @Description: 格式化日期     * @param date     * @param formatString     * @return String     */    public static String formatDate(Date date, String formatString)    {        SimpleDateFormat format = new SimpleDateFormat(formatString);        return format.format(date);    }    /**     * @Title: fromStringToDate     * @Description: 自定义日期，注意 日期字符串需和fomat保持一致     * @param fomat     *            例：yyyy-MM-dd     * @param dateStr     *            例：2015-01-01     * @return Date     * @throws ParseException     */    public static Date fromStringToDate(String fomat, String dateStr)            throws ParseException    {        Date date = null;        date = new SimpleDateFormat(fomat).parse(dateStr);        return date;    }    /**     * @Title: currentDayMinus     * @Description: 根据系统参数对当前日期进行相减操作     * @param formatString 日期格式     * @param days     * @return String 当前日期相减后的日期     */    @SuppressWarnings("static-access")    public static String currentDayMinus(int days, String formatString)    {        DateFormat format = new SimpleDateFormat(formatString);        Date date = new Date();        Calendar c = Calendar.getInstance();        c.setTime(date);        c.add(c.DATE, -days);        Date tempDate = c.getTime();        String currentDayMinus = format.format(tempDate);        return currentDayMinus;    }    /**     * @Title: currentDayMinus     * @Description: 根据系统参数对当前日期进行相加操作     * @param formatString     *            日期格式     * @param days     * @return String 当前日期相加后的日期     */    @SuppressWarnings("static-access")    public static String currentDayAddition(int days, String formatString)    {        DateFormat format = new SimpleDateFormat(formatString);        Date date = new Date();        Calendar c = Calendar.getInstance();        c.setTime(date);        c.add(c.DATE, +days);        Date tempDate = c.getTime();        String currentDayMinus = format.format(tempDate);        return currentDayMinus;    }    /**     * @Title: currentDayAdditionReturnDate     * @Description: 当前日期加n天，返回Date类型     * @param days     * @return Date     */    public static Date currentDayAdditionReturnDate(Date date, int days)    {        // Date date = new Date();        Calendar c = Calendar.getInstance();        c.setTime(date);        c.add(Calendar.DATE, +days);        Date tempDate = c.getTime();        // String currentDayMinus = format.format(tempDate);        return tempDate;    }    /**     * @Title: currentSecondPlus     * @Description: 对当前日期进行秒的加减运算     * @param second     *            与当前时间的差     * @param formatString     * @return String     */    @SuppressWarnings("static-access")    public static String currentSecondPlus(int second, String formatString)    {        DateFormat format = new SimpleDateFormat(formatString);        Date date = new Date();        Calendar c = Calendar.getInstance();        c.setTime(date);        c.add(c.SECOND, second);        Date tempDate = c.getTime();        String restul = format.format(tempDate);        return restul;    }    /**     * @Title: currentDateMinusMin     * @Description: 当前日期     * @param minutes     * @return Date     */    public static Date currentDateMinusMin(int minutes)    {        Date date = new Date();        Calendar c = Calendar.getInstance();        c.setTime(date);        c.add(Calendar.MINUTE, -minutes);        Date tempDate = c.getTime();        return tempDate;    }    /**     * @Title: getCurrentDate     * @Description: 获取当前日期，不带时间     * @return     * @throws ParseException     */    public static Date getCurrentDate() throws ParseException    {        Date today = new Date();        String todayStr = DateUtil.formatDate(today, "yyyy.MM.dd");        Date currentDate = DateUtil.fromStringToDate("yyyy.MM.dd", todayStr);        return currentDate;    }    /**     * @Title: removeTimeInDate     * @Description: 删除日期中的时间     * @param date     * @return Date     * @throws ParseException     */    public static Date removeTimeInDate(Date date) throws ParseException    {        String dateStr = DateUtil.formatDate(date, "yyyy.MM.dd");        Date newDate = DateUtil.fromStringToDate("yyyy.MM.dd", dateStr);        return newDate;    }    /**     * @Title: dateMinus     * @Description: 两日期相减     * @param endDate     * @param currentDate     * @return double     */    public static double dateMinus(Date endDate, Date currentDate)    {        double longTime = endDate.getTime() - currentDate.getTime();        double day = longTime / 1000 / 60 / 60 / 24;        return day;    }    /**     * @Title: getCurrentDateTime     * @Description: 获取当前时间     * @return String     */    public static String getCurrentDateTime()    {        DateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");        return format.format(new Date());    }        /**     * @Title: getCurrentDateStr     * @Description: 获取当前日期串     * @return     */    public static String getCurrentDateStr()    {        DateFormat format = new SimpleDateFormat("yyyy-MM-dd");        return format.format(new Date());    }

    /**     * @Title: getCurrentDateTime     * @Description: 获取当前时间     * @return String     */    public static String getCurrentDateTimeByFomat(String fomat)    {        DateFormat format = new SimpleDateFormat(fomat);        return format.format(new Date());    }    /**     * @Title: getFirstDayOfLastMonth     * @Description: 获取某日期 前n个月的第一天     * @return     * @throws ParseException     */    public static Date getFirstDayOfLastMonth(Date date, int n)            throws ParseException    {        // SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");        // 获取前月的第一天        Calendar cal_1 = Calendar.getInstance();// 获取当前日期        cal_1.setTime(date);        cal_1.add(Calendar.MONTH, -n);        cal_1.set(Calendar.DAY_OF_MONTH, 1);// 设置为1号,当前日期既为本月第一天        Date result = cal_1.getTime();        // String firstDay = format.format(cal_1.getTime());        return removeTimeInDate(result);    }   }

至此，日期方法总结完毕了，该工具类基本上能够满足小伙伴们在开发中遇到的日期问题，希望对大家有帮助！

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