timestamp转换成Date格式

	/**
	 *时间戳转换为Date类型 
	 */
    public Date convert(Object val) {
        if ( val instanceof TIMESTAMP ) {
            try {
                TIMESTAMP ts = (TIMESTAMP)val;
                return ts.dateValue();
            } catch (SQLException e) {
            }
        } else {
            return this.convert(val);
        }
		return null;
    }