java获取时间整点工具代码

　　/**获取上n个小时整点小时时间
     * @param date
     * @return
     */
    public static String getLastHourTime(Date date,int n){
        Calendar ca = Calendar.getInstance();
        ca.set(Calendar.MINUTE, 0);
        ca.set(Calendar.SECOND, 0);
        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
        ca.set(Calendar.HOUR_OF_DAY, ca.get(Calendar.HOUR_OF_DAY)-n);
        date = ca.getTime();
        return sdf.format(date);
    }
    /**获取当前时间的整点小时时间
     * @param date
     * @return
     */
    public static String getCurrHourTime(Date date){
        Calendar ca = Calendar.getInstance();
        ca.set(Calendar.MINUTE, 0);
        ca.set(Calendar.SECOND, 0);
        date = ca.getTime();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
        return sdf.format(date);
    }

原文地址：https://www.cnblogs.com/lm970585581/p/9212237.html