📄 game.jsp

📁 达内JAVA培训-WEB课程部分项目源代码

💻 JSP

字号:

<%@page contentType="text/html;charset=gbk"%>
<%@page import="java.util.Random"%>
<%!
	private int getAnswer(){
		int answer = new Random().nextInt();
		answer = Math.abs(answer);
		answer = answer % 100 + 1;
		return answer;
	}
%>
<%
	//获得用户所猜的数字
	String guess = request.getParameter("guess");
	
	String message = "";
	
	boolean isSuccess = false;
	
	if(guess == null){
		//第一次访问
		//生成随机数，放入session
		session.setAttribute("answer",getAnswer());
		session.setAttribute("times",0);
	}else{
		//正在猜
		//获得所猜次数
		int times = (Integer)session.getAttribute("times");
		//次数加1，放回session
		session.setAttribute("times",times + 1);
		
		//获得用户所猜数字
		int userGuess = Integer.parseInt(guess);
		
		//获得session中保存的随机数
		int answer = (Integer)session.getAttribute("answer");
		
		//比较算法
		if(userGuess == answer){
			isSuccess = true;
			message = "Congratulations，hit it!";
		}else if(userGuess < answer){
			message = "Please try higher!";
		}else{
			message = "Please try lower!";
		}
	}
%>
<html>
<head>
	<title>Game</title>
	<script language="javascript">
	function validate(form){
		if(form.guess.value == ""){
			alert("please input a number between 1 and 100");
			return false;
		}
		
		var pattern = /^[0-9]+$/;
		
		if(!pattern.exec(form.guess.value)){
			alert("please input a number between 1 and 100");
			return false;
		}
	}
	</script>
</head>
<body>
<h2 align="center">Guess Number</h2>
<hr>
Please input a number between 1 and 100.
<%if(!isSuccess){%>
<div align="center">
	<form action="game.jsp" method="post" onsubmit="return validate(this)">
		<input name="guess" type="text"><input type="submit" value="我猜">
	</form>
</div>
<%}%>
<%=message%><br>
<%if(isSuccess){%>
You have tried <%=session.getAttribute("times")%> times.<br>
<a href="game.jsp">play again?</a>
<%}%>
</body>
</html>

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