日期转换方法

/**
     * 获取实时时间
     * @return
     */
    public String nowDate() {
        Date day = new Date();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        String today = sdf.format(day);
        return today;
    }
    
    /**
     * 转换时间 09:45:00
     * @param str
     * @return
     */
    public static Date strToDate(String str) {
        SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss");
        Date date = null;
        try {
            date = sdf.parse(str);
        } catch (ParseException e) {

        }
        return date;
        
    }
    
    /**
     * 日期转字符串
     * @param date
     * @return
     */
    public static String DateToString(Date date) {
        
        SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss");
        String string = sdf.format(date);
        return string;
    }
    
    public static String DateToString2(Date date) {
        
        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
        String string = sdf.format(date);
        return string;
    }