jsp-简单的猜数小游戏

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<%

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%>">

    <title>My JSP 'game.jsp' 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">

    -->

  </head>

  <body>

    <%!int count = 0;%>

    <%

        Object obj = session.getAttribute("numint");//第一次访问的时候，为null，第二次访问之后，都有值

        if (obj == null) {

            Random r = new Random();

            obj = r.nextInt(100);

            session.setAttribute("numint", obj);

        }

        int rm = Integer.parseInt(obj.toString());

    %>

    <%

        String numstr = request.getParameter("num");//获取猜数的数字

        int cou=0;

        if (numstr != null && !"".equals(numstr)) {//直接浏览器url访问jsp，num值为null，提交的时候，没有输入num的值，num值为""

            //num肯定是有值

            count++;

            cou=count;

            int num = Integer.parseInt(numstr);

            if (num > rm) {

                out.println("太大了");

            } else if (num < rm) {

                out.println("太小了");

            } else {

                out.println("终于猜正确了");

                Random r = new Random();

                obj = r.nextInt(100);

                session.setAttribute("numint", obj);

                count=0;

            }

        }

    %>

    欢迎您玩猜数游戏,猜了

    <%=cou%>次<%--<%out.print(rm); --%>

    <form action="game.jsp" method="post">

        <br> 输入数字 <input name="num"> <input type="submit"

            value="点击确认">

    </form>

  </body>

</html>
运行截图:
巴特西

jsp-简单的猜数小游戏

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