ConvertUtils.register(new Converter(){

       public Object convert(Class type, Object value){

          if(value == null){

             return null;

          }

          if(!(value instanceof String)){

             throws ConversionException("只支持八种基本默认数据类型转换");

          }

          String str = (String)value;

          if(str.trim().equals("")){

             return null;

          }

          SimpleDateFormat dr = new SimpleDateFormat("yyyy-MM-dd");

          try{

          return dr.parse(str);

          }catch(ParseException e){

            throws RuntimeException(e);  //e，异常链不可断

          }

       }

 }, Date.class)