文章摘要
这篇文章描述了一个基于JavaServer Pages（JSR）的猜拳游戏应用。用户通过提交选项（“jiandao”、“shitou”或“bu”）参与游戏，而服务器端会随机生成一个选项进行比较。根据结果，服务器会更新玩家的胜负和平局统计，并将结果存储在数据库中。文章还提到了使用 strengthened digests 的安全措施以防止跨站脚本攻击。核心内容是展示一个简单的游戏逻辑和数据统计功能。
<html>
<head>
<base href=”https://www.jb51.net/article/<%=basePath%>” >
<title>My JSP ‘result.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=”https://www.jb51.net/article/styles.css” rel=”external nofollow” rel=”external nofollow” >
–>
</head>
<body>
<%
String pathnew=request.getContextPath();
//获取游戏参与者的选项值
String res=request.getParameter(“option”);
String reslong=res+”.jpg”;
//产生随机数进行匹配图片
int com=(int)Math.random()*3;
String computer=String.valueOf(com);
//computer=0 jiandao
//computer=1 shiyou
//computer=2 bu
if(computer.equals(“0″)){
computer=”jiandao”;
}
else if(computer.equals(“1″)){
computer=”shitou”;
}
else{
computer=”bu”;
}
String computerlong=computer+”.jpg”;
int win=0;
int lost=0;
int ping=0;
Object objwin=session.getAttribute(“win”);
Object objlost=session.getAttribute(“lost”);
Object objping=session.getAttribute(“ping”);
if(objwin==null){
session.setAttribute(“win”,String.valueOf(win));
}
if(objlost==null){
session.setAttribute(“lost”,String.valueOf(lost));
}
if(objping==null){
session.setAttribute(“ping”,String.valueOf(ping));
}
%>
<h3>结果是</h3>
<!– 图片传值 –>
您出的是：<img alt=”” src=”https://www.jb51.net/article/<%=pathnew %>/images/<%=reslong %>”>
<span style=”bold” color=”red”>vs</span>
电脑出的是：<img alt=”” src=”https://www.jb51.net/article/<%=pathnew %>/images/<%=computerlong %>”>
<%
//逻辑判断，session更新统计值，
if(res.equals(computer)){
out.println(“平局!”);
//session.setAttribute(“ping”,String.valueOf(Integer.valueOf((String)session.getAttribute(“ping”))+1));
session.setAttribute(“ping”,String.valueOf(Integer.valueOf((String)session.getAttribute(“ping”))+1));
}
else if((res.equals(“jiandao”)&&computer.equals(“bu”))||(res.equals(“shitou”)&&computer.equals(“jiandao”))||(res.equals(“bu”)&&computer.equals(“shiyou”))){
out.println(“您赢了!”);
//session.setAttribute(“win”,String.valueOf(Integer.valueOf((String)session.getAttribute(“win”))+1));
session.setAttribute(“win”,String.valueOf(Integer.valueOf((String)session.getAttribute(“win”))+1));
}
else{
out.println(“您输了!”);
session.setAttribute(“lost”,String.valueOf(Integer.valueOf((String)session.getAttribute(“lost”))+1));
//session.setAttribute(“lost”,String.valueOf(Integer.valueOf((String)session.getAttribute(“lost”))+1));
}
%>
<h3>统计结果，待写入数据库</h3>
您一共玩了<%=String.valueOf(
Integer.valueOf((String)session.getAttribute(“win”))+Integer.valueOf((String)session.getAttribute(“lost”))+Integer.valueOf((String)session.getAttribute(“ping”)) )%>局<br/>
您赢了<%=String.valueOf(
Integer.valueOf((String)session.getAttribute(“win”))) %>局<br/>
您输了<%=String.valueOf(
Integer.valueOf((String)session.getAttribute(“lost”))) %>局<br/>
打平了<%=String.valueOf(
Integer.valueOf((String)session.getAttribute(“ping”))) %>局<br/>
</body>
</html>