（1）<%request.setCharacterEncoding("GB2312");String chatUser=(String)session.getAttribute("chatUser");session.setAttribute("chatUser",chatUser);String chatText=(String)application.getAttribute("chatText");
if(chatText==null)
{chatText="";}if(chatText!=null){chatText+="<br>"+chatUser+":"+chatText;}
%>
（2）
<%request.setCharacterEncoding("GB2312");String chatUser=request.getParameter("chatUser");String chatText=request.getParameter("chatText");
//chatText+="<br>"+chatText;application.setAttribute("chatText",chatText);response.sendRedirect("chatIndex.jsp"); %>
//输出的时候字符怎么不能存储呢