servlet的问题。。求助。。在线等。。

补一下代码，这个就是显示主题的代码。。
out.println("<html>");
        out.println("<head><title>论坛主页</title></head>");
        out.println("<body bgcolor=\"#ffffff\">");
        out.println("<form action=\"\"><table align=center border=1>");
        out.println("<tr><th colspan=3 align=center>论坛主题</th></tr><th "+
                    "colspan=3 align=center>|发帖人|   |主题|</th></tr>");
        LInkDB objDB=new LInkDB();
        con=objDB.DataBaseLink();
        try {
            Statement st = con.createStatement();
            rs = st.executeQuery("select * from topic");
            while(rs.next()){
                String TID=rs.getString(1);
                session.setAttribute("TID",TID);
                String TUID=rs.getString(2);
                //session.setAttribute("TUID",TUID);
                String Topic=rs.getString(3);
                //session.setAttribute("Topic",Topic);
                out.println("<tr><td>"+objSt.Topic(TUID)+"</td>");
                out.println("<td><a href=\"servlet?TID="+TID+"topicservlet\">"+Topic+"</a></td></tr>");
            }
        } catch (SQLException ex) {
            ex.printStackTrace();
        }
        if(session.isNew()){
            out.print("请<a align=center href=\"Enter.html\">登录</a>发表");
        }else{
            out.print("<a align=center href=\"\">发表新帖</a>");
        }
        out.println("</tbale></body>");
        out.println("</html>");
        out.close();