下拉框

1.VO属性设为MAP：
   private HashMap cityHm = null;
   /**
     * 设置城市信息
     * @param id 城市ID
     * @param desc 城市显示名
     */
    public void setCityHm(String id,String desc)
    {
        if(cityHm == null){
            cityHm = new HashMap();
        }
        cityHm.put(id,desc);
    }

    public void setCityHm(HashMap cityHm)
    {
        this.cityHm=cityHm;
    }
    /**
     * 获取城市HASH年信息
     * @return HashMap 城市信息的HASHMAP
     */
    public HashMap getCityHm()
    {
        return cityHm;
    }


2.ACTIONFORM属性设为List：
    public List getCityList()
    {
        return cityList;
    }

    public void setCityList(List cityList)
    {
        this.cityList = cityList;
    }

3.Service层中查数据赋值到MAP中：
... ...
String citySql="select CITYID,CITYNAME,PROVINCEID from city c  where c.PROVINCEID = ?";
String[] cityParam={provinceId};  //通过省ID查相关城市
HashMap cityMap=this.parseParam(citySql,cityParam);
if(cityMap==null){
      cityMap=new HashMap();
}
if(typeId==ActionConstants.ACT_ID_UPDATE){
      cityMap.put("-1", "请选择");
}else if(typeId==ActionConstants.ACT_ID_ADD){
      cityMap.put("-1", "请选择");
}else if(typeId==ActionConstants.ACT_ID_QUERY){
      cityMap.put("-1", "全部");
}
vo.setCityHm(cityMap);
retrun vo;
... ...


4.Action 中赋值: getList调用下面方法

MiscPrefixInitVO initVO = (MiscPrefixInitVO)result.getretVO();
prefixNumForm.setCityList(getList(initVO.getCityHm()));
return mapping.findForward("query");

/**
     * 把hashMap内容排序后放到List
     *
     * @param map HashMap
     * @param select int
     * @return ArrayList
     */
    private List getList(HashMap map)
    {
        ArrayList list = new ArrayList();
        if(map == null){
            return list;
        }
        LabelValueBean labelValue = null;

        //排序
        Set set = map.keySet();
        Object[] obj = set.toArray();
        int[] iobj = new int[obj.length];
        List keylist = new ArrayList();
        for(int i = 0; i < obj.length; ++i){
            iobj[i] = Integer.parseInt(obj[i] + "");
            keylist.add(new Integer(iobj[i]));
        }
        Collections.sort(keylist);
        //~排序结束

        Iterator itor = keylist.iterator();
        String key = null;
        while(itor.hasNext()){
            key = itor.next() + "";
            labelValue = new LabelValueBean(map.get(key) + "", key);
            list.add(labelValue);
        }
        return list;
    }

5.JSP页面显示：
<html:select property="city">
        <html:optionsCollection name="prefixNumForm" property="cityList"/>
</html:select>



直接传SQL语句合查询条件的参数查数据：-----------------------------------------------------------------------
返回的是map

 private HashMap parseParam(String sql,Object[] param)throws FrameException{
    ResultSet rs = null ;
    PreparedStatement stm = null ;
    Connection conn = null ;
    HashMap map=new HashMap();
    try 
    {
      conn=JdbcConnSource.getConnection();
    }
    catch (Exception ex) 
    {
        FrameException fe =new FrameException(OAMErrorCodeConst._EC_WTC_DB_ERROR,ex);
        throw fe;
    }
    try
    {
      stm = conn.prepareStatement ( sql ) ;
      if ( param != null )
        for ( int i = 0 ; i < param.length ; i++ )
          stm.setObject ( i + 1 , param[i]) ;
      	  rs = stm.executeQuery () ;
      while(rs.next())
      {
        map.put(rs.getString(1),rs.getString(2));
      }
    }
    catch ( SQLException e )
    {
        FrameException fe =new FrameException(OAMErrorCodeConst._EC_WTC_DB_ERROR,e);
        throw fe;
    }
    catch ( Exception e )
    {
        FrameException fe =new FrameException(OAMErrorCodeConst._EC_WTC_DB_ERROR,e);
        throw fe;
    }
    finally
    {
      JdbcConnSource.close(rs, stm, conn);
    }
    return map;
  }