servlet查詢代碼如下public void doPost(HttpServletRequest request, HttpServletResponse response)             throws ServletException, IOException {         response.setContentType("text/html");         ServletOutputStream out=response.getOutputStream();         String stnm=request.getParameter("stnm");         try {             Statement stat = conn.createStatement();             ResultSet rs = stat.executeQuery("select * from qstation where stnm ='"+stnm+"'");             while (rs.next()) {                 ResultSetMetaData   rsmd1 = rs.getMetaData();                 int   count = rsmd1.getColumnCount();                 String all="";                 for (int i =1; i < count+1; i++) {                     all=all+rs.getString(i)+",";                 }                 System.out.println(all);                 out.println(all);             }         } catch (Exception e) {             // TODO: handle exception         }     }system.out.println打印的消息是：58238,320101,null,060602,南京,11880.0,3200.0,1,125.0,null,蘇,南京市,南京市轄區,長江流域,中下游區,長江下游,101190101,華東電網,江蘇,1,01,01,2,2,1,220101,但是前臺頁面只顯示：58238,320101,null,060602,請問這是什么問題？