<form action="${pageContext.request.contextPath }/first.do" method="post">

   <h1>参数绑定转换器</h1>

                出生日期:<input name="birthday" value="${birthday}"/><br/><br/>

                年龄:<input name="age" value="${age }"/><br/><br/>

      <input type="submit" value="注册"/>

   </form>

public class MyDateEditor extends PropertiesEditor{

    @Override

    public void setAsText(String source) throws IllegalArgumentException {

      SimpleDateFormat sdf=getDate(source);

      try {

		setValue(sdf.parseObject(source));

      } catch (ParseException e) {

		e.printStackTrace();

      }

    }

	private SimpleDateFormat getDate(String source) {

		SimpleDateFormat sdf=null;

		if (Pattern.matches("^\\d{4}-\\d{2}-\\d{2}$", source)) {

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

		}else if (Pattern.matches("^\\d{4}/\\d{2}/\\d{2}$", source)) {

			sdf=new SimpleDateFormat("yyyy/MM/dd");

		}else if (Pattern.matches("^\\d{4}\\d{2}\\d{2}$", source)) {

			sdf=new SimpleDateFormat("yyyyMMdd");

		}else {

			throw new TypeMismatchException("", Date.class);

		}

		return sdf;

	}

}