Create a login page
<% @ Page Language = "Java" pageencoding = "gb2312" %>
<! Doctype HTML public "-// W3C // dtd html 4.01 transitional // en">
<HTML>
<Head>
<Meta http-equiv = "Content-Type" content = "text/html; charset = gb2312"/>
<Title> User Logon </title>
</Head>
<Body>
<Form action = "chart. jsp" method = "Post">
Account <input type = "text" name = "username"/>
Password <input type = "password" name = "passwd"/>
<Input type = "Submit" value = "OK"/>
</Form>
</Body>
</Html>
Create a chat page named chart. jsp
<% @ Page contenttype = "text/html; charset = GBK" Import = "Java. util. *" %>
<%
String Path = request. getcontextpath ();
String basepath = request. getscheme () + ": //" + request. getservername () + ":" + request. getserverport () + path + "/";
%>
<! Doctype HTML public "-// W3C // dtd html 4.01 transitional // en">
<HTML>
<Head>
<Base href = "<% = basepath %>">
<Meta http-equiv = "Content-Type" content = "text/html; charset = gb2312"/>
<Title> my JSP 'chart. js' starting page </title>
<Meta http-equiv = "Pragma" content = "no-Cache">
<Meta http-equiv = "cache-control" content = "no-Cache">
<Meta http-equiv = "expires" content = "0">
<Meta http-equiv = "keywords" content = "keyword1, keyword2, keyword3">
<Meta http-equiv = "Description" content = "this is my page">
<! --
<LINK rel = "stylesheet" type = "text/CSS" href = "styles.css">
-->
<% Response. setintheader ("refresh", 10); %>
</Head>
<Body>
Welcome to the website Chat System
<%
/**
Purpose: To simulate a chat room Program
Test method: open three IE Windows on the local machine and go to the logon interface. Speak again.
The response may not be very fast. Wait for a while. I have tested it.
**/
Try {
// Obtain the user passed through the user login interface
String loginname = request. getparameter ("username ");
// Obtain the user's sessionid
String usersessionid = (string) Session. getattribute ("usersessionid ");
// Retrieve the user account based on sessionid
String name = (string) Session. getattribute (usersessionid + "user ");
// If loginnmae! = NULL indicates the first time the user logs in
If (loginname! = NULL)
{// Create a sessionid for the first login and use the current system time as the sessionid
Usersessionid = system. currenttimemillis () + "";
Session. setattribute ("usersessionid", usersessionid );
// The storage account is in the session
Session. setattribute (usersessionid + "user", loginname );
}
// Obtain the user's speech
String word = request. getparameter ("yourwords ");
// Speaks from history of all users in the Application
String chart = (string) application. getattribute ("chart ");
// When the speech reaches a certain length, it will be cleared to avoid depletion of memory
If (chart! = NULL & chart. Length ()> 10000) application. setattribute ("chart ","");
If (name! = NULL & word! = NULL ){
// Assemble the statement that the user speaks on the screen:
String userword = new date () + "username: [" + name + "]:" + word;
// Save the user's speech to the history
Chart + = userword + "/R/N ";
Application. setattribute ("chart", chart );
}
%>
<Textarea rows = "15" Cols = "40" name = "output" style = "width: 100%">
<% IF (name! = NULL) Out. Print (Chart );
%>
</Textarea>
<% IF (name! = NULL) Out. Print (name + "say"); %>
<Form action = "" method = "Post">
<Input type = "text" size = "45" name = "yourwords">
<Input type = "hidden" name = "chart"> <br>
<Input type = "Submit" value = "send"/>
</Form>
</Body>
</Html>
<%} Catch (exception e ){
E. printstacktrace ();
} %>
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