/***
* 根据父节点目录获取所有子节点目录信息
* @param parentId
* @return
*/
public List getCatalog( int parentId){
   Connection conn = null;
         Statement stmt = null;
         ResultSet rs = null;
   List list=new ArrayList();
   try
        {
                conn = DBUtil.getConnection();
                stmt = conn.createStatement();
                String queryStr1 = "SELECT ID,CATALOGNAME,PARENTID,level FROM TM_BOOKCATALOG_TAB START WITH PARENTID = "+parentId+" CONNECT BY PRIOR ID IN PARENTID";
               // System.out.println("------------------执行"+queryStr1);
                rs = stmt.executeQuery(queryStr1);
                while (rs.next())
                {
                Bookcatalog bc = new Bookcatalog();
                bc.setId(Integer.parseInt(rs.getString("ID")));
                bc.setCatalogname(rs.getString("CATALOGNAME"));
                bc.setParentid(Integer.parseInt(rs.getString("PARENTID")));
                bc.setLevel(Integer.parseInt(rs.getString("level")));
                // System.out.println("------------------结果"+bc.getCatalogname());
                list.add(bc);
                }
               
               /// System.out.println("------------------执行");
        }
        catch (SQLException se)
        {
                se.printStackTrace();
                throw new BookCatalogDAOSysException("树形查询出错");
        }
        finally
        {
                DBUtil.closeResultSet(rs);
                DBUtil.closeStatement(stmt);
                DBUtil.closeConnection(conn);
        }
       
   return list;
}
int level= ( (Bookcatalog)allCataLog.get(i)).getLevel();
以下是循环中打印的树形目录

<!-- 目录 -->
     <%
      if (level==1)
      {
     %><img src="images/images/bg_1.gif" border=0/><%
      }else
      {
     %><img src="images/images/bg_3.gif" border=0/><%
      }
      for (int j=0;j<level-1;j++)
      {
     %><img src="images/images/bg_31.gif" border=0/><%
      } 
     %>
    
     <%
        if (level>1)
      {
     %><img src="images/images/bg_2.gif" border=0/><%
      }
     %>    
      <%=( (Bookcatalog)allCataLog.get(i)).getCatalogname() %>