Web jsp开发学习——网上直播聊天室的简单开发

整个界面为chat.jsp：

如果用户没有登录，就不能进行聊天。

为将发言的句子传到页面上，要设置一个<iframe></iframe>虚拟框架，将allmessage.jsp的内容转过来

而allmessage.jsp里的内容是通过application获取发言的内容。点击“发言”，会调用chat.do的servlet，

使用重定向可以将application传到allmessage.jsp

Web jsp开发学习——网上直播聊天室的简单开发

chat.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<!DOCTYPE html>

<html>

<head>

<meta charset="UTF-8">

<title>直播室</title>

<style>

    #main #allmsg{border:solid 1px #ccc; height:400px;}

    #main #mymsg input[type=text]{width:800px; height:30px; }

    #main #mymsg input[type=submit]{width:80px; height:36px;

        font-size:20px; vertical-algin:middle; line-height:30px;}

</style>

<script>

    function Clear(){

        var frm = document.getElementById("form1");

        var obj = document.getElementById("msg");

        frm.submit();

        obj.value = "";

        return false

    }

</script>

</head>

<body>

<jsp:include page = "head.jsp?col=4"></jsp:include>

<div id="main" class="layout">

    <div id="allmsg">

        <iframe src="allmessage.jsp" width="1000" height="400" name="f1" frameborder="0"></iframe>

    </div>

    <%

        String user = (String)session.getAttribute("username");

        if(user!=null){

    %>

        <div id="mymsg">

            <form id="form1" action="chat.do" method="post" target="f1" onsubmit="return Clear();">

            <input type="text" id="msg" name="message">

            <input type="submit" value="发言">

            </form>

        </div>

    <%

        }

    %>

</div>

<%@ include file="foot.jsp" %>

</body>

</html>

ChatServlet doGet

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        // TODO Auto-generated method stub

        //获取表单数据

        request.setCharacterEncoding("utf-8");

        String msg = request.getParameter("message");

        System.out.println(msg);

        //获取session

        HttpSession session = request.getSession();

        String user = (String)session.getAttribute("username");

        //加入application

        ServletContext application = this.getServletContext();

        String allmsg = (String)application.getAttribute("chat");

        if(allmsg == null) {

            allmsg = "["+Tools.getTime()+"]"+ user + "说：" + msg + "<br>";

        }else {

            allmsg += "["+Tools.getTime()+"]"+ user + "说：" + msg + "<br>";

        }

        application.setAttribute("chat", allmsg);

        System.out.println(allmsg);

        // 重定向

        response.sendRedirect("allmessage.jsp");

    }

获取时间用这个