postmsg.jsp

可以马上用的JSP聊天程序

<%@ page import="java.util.Date"%>
<%	
String User = (String) session.getAttribute("User");
//从session对象中取得名称为User的资料

//判断session对象中的User资料, 是否为空值, 是则代表用户尚未完成登录
if(User == null)   
	response.sendRedirect("LogFrm.jsp"); //将浏览器导向至登录网页

String Msg = null; 

//下面的for循环将把每个信息向后移动
for(int i = 40; i >= 2; i--)
{
	Msg = (String)application.getAttribute("Msg" + (i - 1));
	application.setAttribute("Msg" + i, Msg);
}

Date Now = new Date(); //取得目前的系统时间
String year = String.valueOf(Now.getYear() + 1900);
String month = String.valueOf(Now.getMonth() + 1);
String day = String.valueOf(Now.getDate());
String hour = String.valueOf(Now.getHours());
String minute = String.valueOf(Now.getMinutes());
String second = String.valueOf(Now.getSeconds());

String time = year + "/" + month + "/" + day + " "
	      + hour + ":" + minute + ":" + second;
//取得目前的日期与时间

Msg = "<TD><IMG SRC = images/" + session.getAttribute("Sex") +
      ".gif></TD><TD><Font Size=4 Color = Gray><B>" +
      session.getAttribute("User") + "</B></Font></TD>" +
      "<TD width = 300><Font Size=4><B>说:" + 
      request.getParameter("Msg") + "</B></FONT></TD>" +
      "<TD><Font Size=4 Color = Red>[" + time + "]</Font></TD>";
//设置新信息字串

application.setAttribute("Msg1", Msg);
//设置新信息

response.sendRedirect("chat.jsp");
//将子窗口导向回到用于显示信息的chat.jsp
%>