sendmsg.jsp
来自「jsp的技术教程」· JSP 代码 · 共 146 行
JSP
146 行
<%@ page import="java.util.Vector" %>
<%@ page contentType="text/html;charset=gb2312" %>
<%@ page import="java.util.Hashtable" %>
<%@ page import="java.util.Date" %>
<html>
<title>发送聊天信息</title>
<head>
<script language="JavaScript" type="text/javascript">
function setCookie()
{
document.cookie=form1.toTalk.selectedIndex+"#";
}
function setFocus()
{
form1.message.focus();
var cookieValue=document.cookie;
var formValue=cookieValue.split("#");
form1.toTalk.selectedIndex=formValue[1];
_formValue=formValue[0].split(";");
}
</script>
</head>
<body bgcolor="#CCCCFF" onload="setFocus()">
<%!
//define a useful function which will be used by the following code
public void clearVector()
{
Vector _tempchatMsg=(Vector)getServletContext().getAttribute("chatMsg");
if (_tempchatMsg.size()>40)
{
_tempchatMsg.removeAllElements();
_tempchatMsg.addElement("<font color='orange' size='2'>"+"系统管理员清除了消息队列，大家慢聊"+".</font><br>");
}
}
%>
<%
//***********************************************************************************************
//初始化一些常用的变量
boolean boolcanupdatemsg=true;
Vector tempchatMsg=(Vector)getServletContext().getAttribute("chatMsg");
String cUserName=(String)session.getAttribute("username");
Date userTime=new Date();
String timestamp="["+userTime.getHours()+":"+userTime.getMinutes()+":"+userTime.getSeconds()+"]";
//***********************************************************************************************
%>
<%
//***********************************************************************************************
//receive some parameter and analysis them
byte[] temp_t;
String temp_p;
temp_p=request.getParameter("message");
temp_t=temp_p.getBytes("ISO8859-1");
String temp=new String(temp_t);
byte[] talkTo_t;
String talkTo_p;
talkTo_p=request.getParameter("toTalk");
talkTo_t=talkTo_p.getBytes("ISO8859-1");
String talkTo=new String(talkTo_t);
%>
<%
//analysis the parameter
if(temp.startsWith("<"))
{
temp="<font color='red' size='2'>请不要使用html标记"+timestamp+"</font><br>";
tempchatMsg.addElement(temp);
boolcanupdatemsg=false;
getServletContext().setAttribute("chatMsg",tempchatMsg);
}
if (temp.endsWith("/>"))
{
temp="<font color='red' size='2'>请不要使用html标记"+timestamp+"</font><br>";
tempchatMsg.addElement(temp);
boolcanupdatemsg=false;
getServletContext().setAttribute("chatMsg",tempchatMsg);
}
if (talkTo.equals("all"))
{
talkTo="每一个人";
}
%>
<%
cUserName="<font color='red' size='2'>"+cUserName+"</font>";
talkTo="<font color='#0000FF' size='2'>"+talkTo+"</font>";
if (boolcanupdatemsg==true)
{
//update some msg so that the user have the asbility to update the msg
Hashtable userLife=(Hashtable)getServletContext().getAttribute("userLife");
userLife.put((String)session.getValue("username"),new Long(userTime.getTime()));
getServletContext().setAttribute("userLife",userLife);
//**************************************************************
}
if (boolcanupdatemsg==true)
{
tempchatMsg.addElement(cUserName+"对"+talkTo+"说："+temp);
getServletContext().setAttribute("chatMsg",tempchatMsg);
}
%>
<form action="sendmsg.jsp" method="post" onsubmit="setCookie()" id="form1">
<table border="0" cellspacing="3" cellpadding="0">
<tr>
<td><%=session.getValue("username")%></td>
<td align="left" colspan="2">
<input name="message" style="HEIGHT: 21px; WIDTH: 367px">
</td>
</tr>
<tr>
<td align="center">
对象
</td>
<td align="left">
<!--在一个下拉列表中显示所有用户名供用户选择-->
<select name="toTalk">
<option value="all">全体在聊</option>
<%
Vector tempuser=(Vector)getServletContext().getAttribute("chatUser");
for (int i=0;i<tempuser.size();i++)
{
out.println("<option>");
out.println(tempuser.elementAt(tempuser.size()-i-1).toString());
out.println("</option>");
}
%>
</select>
<input type="submit" value="说话呀" name="submit">
</td>
<td>
<a href="leavechat.jsp" target="_top">离开聊天室</a>
</td>
</tr>
</table>
</form>
</body>
</html>
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