/**

      * 字符串转Date方法

      * @param dateStr

      * @param format 如yyyy-MM-dd HH:mm:ss等

      * @return

      * @throws Exception

      */

     public static Date stringToDate(String dateStr,String format) throws Exception{

         if(dateStr==null||"".equals(dateStr)){

             throw new Exception("stringToDate:要转换的日期参数为空！");

         }

         Date date = null;

         try{

             SimpleDateFormat sdf = new SimpleDateFormat(format);

             date = sdf.parse(dateStr);

         }catch(Exception e){

             e.printStackTrace();

         }

         return date;

     }

     /**

      * Date转字符串方法

      * @param date

      * @param format 如yyyy-MM-dd HH:mm:ss等

      * @return

      * @throws Exception

      */

     public static String dateToString(Date date,String format) throws Exception{

         if(date==null){

             throw new Exception("dateToString:要转换的日期参数为空！");

         }

         String dateStr = "";

         try{

             SimpleDateFormat sdf = new SimpleDateFormat(format);

             dateStr = sdf.format(date);

         }catch(Exception e){

             e.printStackTrace();

         }

         return dateStr;

     }