下拉列表日期保存不变的写法

  com.huanglq.util;
public class PublicOption{
public static String getNumSelOption(int from, int to, String val)
{
        StringBuffer sb = new StringBuffer();
        String szIdx = "";
        String szVal = "";
        if (val != null) szVal = val;
        for (int i=from; i<=to; i++)
        {
            if (i<10) szIdx = "0"+i;
            else szIdx = ""+i;
            if (szIdx.equals(szVal) || szIdx.equals("0"+szVal))
                sb.append("  <option value='"+szIdx+"' selected>"+i+"</option> \n");
            else
                sb.append("  <option value='"+szIdx+"'>"+i+"</option> \n");
        }
        return sb.toString();
  }
}

页面的对应内容:
<tr>
              <td height="30"><font color="#FF6600">＊</font>出生日期：</td>
              <td> <input name="birthday" type="hidden"><input name="birthdayYear" type="text" size="4" maxlength="4">年
                <select name="birthdayMonth">
                   <% out.println(com.huanglq.util.PublicOption.getNumSelOption(1, 12, birthdayMonth)); %>
                </select>
                月
                <select name="birthdayDay">
                   <% out.println(com.huanglq.util.PublicOption.getNumSelOption(1, 31, birthdayDay)); %>
                </select>
                日 </td>
            </tr>
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上 面的在提交时用 的 ,做显示时要先从action获得entity类,然后就可以直接用entity类的属性来显示了