jsp实现简单聊天室
实现简单聊天室。要求以B/S方式实现多人聊天，可以保留聊天者的昵称和聊天内容。主要由7个jsp页面组成main.jsp<%@ page language="java" contentType="text/html; charset=UTF-8" import="java.util.*" pageEncoding="utf-8"%><!DOCTYPE html PUBLI...
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实现简单聊天室。要求以B/S方式实现多人聊天，可以保留聊天者的昵称和聊天内容。
主要由7个jsp页面组成
main.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
</head>
<frameset rows="80%,*">
<frameset cols="20%,*">
<frame src="list.jsp"/>
<frame src="msg.jsp"/>
</frameset>
<% response.setHeader("refresh", "10"); %>
<frame src="send.jsp"/>
</frameset>
</html>
login.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'login.jsp' starting page</title>
</head>
<body>
<%
String msg = (String) request.getAttribute("msg");
if(msg == null){
msg = "";
}
%>
<p><%=msg %></p>
<form action="deal_login.jsp" method="post" name="login_form">
<p align="center" >用户名<input type="text" name="username"/></p>
<p align="center"><input type="submit" value="登入"/></p>
</form>
</body>
</html>
deal_login.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'deal_login.jsp' starting page</title>
</head>
<body>
<%
request.setCharacterEncoding("utf-8");
//获取login.jsp表单中提交过来得值
String username = request.getParameter("username");
//判断用户名是否为空
if(username.trim().length() == 0){
request.setAttribute("msg", "用户名不得为空");
request.getRequestDispatcher("login.jsp").forward(request,response);
return ;
}
//从application作用域中取出用户列表
List<Object> users = (List<Object>) application.getAttribute("users");
//如果没有用户列表，进行实例化
if(users == null){
users = new ArrayList<Object>();
}
//查看当前列表中是否包含当前得登录用户
if(users.contains(username)){
//包含登入用户，设置提醒信息
request.setAttribute("msg", "该用户已登入，请重新登入");
request.getRequestDispatcher("login.jsp").forward(request,response);
return;
}
//将登入用户的用户名加入该用户列表
users.add(username);
application.setAttribute("users", users);
session.setAttribute("user", username);
response.sendRedirect("main.jsp");
%>
</body>
</html>
loginOff.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'loginOff.jsp' starting page</title>
</head>
<body>
<%
//从application作用域中读取用户列表
List<Object> users = (List<Object>)application.getAttribute("users");
String username = (String) session.getAttribute("user");
//从该用户列表中移除该用户
users.remove(username);
application.setAttribute("users",users);
//注销该用户的会话
session.invalidate();
%>
<jsp:forward page="login.jsp"/>
</body>
</html>
list.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'list.jsp' starting page</title>
</head>
<body>
<%
//设置刷新间隔
response.setHeader("refresh", "1");
//从application作用域中读取用户列表
List<Object> users = (List<Object>) application.getAttribute("users");
out.print("目前在线的人有："+ users.size()+"人");
for(int i=0;i<users.size();i++){
String username = (String) users.get(i);
out.print("<li>"+username);
}
%>
</body>
</html>
msg.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
</head>
<body>
<%
response.setHeader("refresh", "1");
List<Object> msgs = (List<Object>) application.getAttribute("msgs");
List<Object> to_sb = (List<Object>) application.getAttribute("private");
List<Object> from_sb = (List<Object>) application.getAttribute("S_private");
String user = (String)session.getAttribute("user");
try{
for(int i=0;i< msgs.size();i++){
String t1 = (String) msgs.get(i);
String t2 = (String) to_sb.get(i);
String t3 = (String) from_sb.get(i);
if(t2.equals(user) || t2.equals("所有人") || t3.equals(user)){
out.print(t1);
}
}
}catch(Exception e){}
%>
</body>
</html>
send.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
</head>
<body>
<form action="" method="post">
<p align="right">
<%=session.getAttribute("user") %>：
发送消息给：
<select name="select">
<option value="0">所有人</option>
<%
List<Object> users = (List<Object>) application.getAttribute("users");
for(int i=0;i<users.size();i++){
String username = (String) users.get(i);%>
<option value="<%=i+1 %>"><%=username %></option>
<%}
%>
</select>
<input type="text" name="message" size="50" /><br>
<input type="submit" value="发送"/>
<input type="button" value="退出登录" onClick="parent.location.href='loginOff.jsp'">
</form>
<%
String user = (String) session.getAttribute("user");
request.setCharacterEncoding("utf-8");
String message = request.getParameter("message");
String to="";
try{
//被发送信息方
List<Object> tmp = (List<Object>) application.getAttribute("users");
String SS = request.getParameter("select");
int a = Integer.parseInt(SS);
if(a==0){
to="所有人";
}
else{
to=(String)tmp.get(a-1);
}
}catch(Exception e){}
List<Object> msgs = (List<Object>) application.getAttribute("msgs");
if(msgs == null){
msgs = new ArrayList<Object>();
}
List<Object> to_sb = (List<Object>) application.getAttribute("private");
if(to_sb == null){
to_sb = new ArrayList<Object>();
}
List<Object> from_sb = (List<Object>) application.getAttribute("S_private");
if(from_sb == null){
from_sb = new ArrayList<Object>();
}
if(message != null && !message.equals("")){
msgs.add(user+"发送信息给"+to+":" +message +"<br/>");
to_sb.add(to);
from_sb.add(user);
application.setAttribute("msgs", msgs);
application.setAttribute("private", to_sb);
application.setAttribute("S_private", from_sb);
}
%>
</body>
</html>
实验效果：
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