<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB18030">
<title>Include</title>
</head>
<body>
<%double i = Math.random();%>
<jsp:include page="come.jsp">//加载come.jsp
<jsp:param name="number" value="<%=i%>" />//传递参数
</jsp:include>
</body>
</html>
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB18030">
<title>come</title>
</head>
<body bgcolor=cyan>
<Font Size=3>
<%//得到includeAction.jsp传来的值:
String str = request.getParameter("number");
double n = Double.parseDouble(str);
%>
The value form includeAction is:<br> <%=n%>
</Font>
</body>
</html>
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB18030">
<title>Login</title>
</head>
<body>
//由 checklogin.jsp处理表单数据
<form action="checklogin.jsp" method="get">
<table>
<tr>
<td>Username:</td>
<td> //得到参数"user",初始值为null
<input type="text" name="username"
value=<%=request.getParameter("user") %>>
</td>
</tr>
<tr>
<td>Password:</td>
<td>
<input type="password" name="password">
</td>
</tr>
<tr>
<td>
<input type="submit" value="login">
</td>
</tr>
</table>
</form>
</body>
</html>
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB18030">
<title>CheckLogin</title>
</head>
<body>
<%
//与login.jsp中name="username"对应
String name = request.getParameter("username");
//与login.jsp中name="password"对应
String password = request.getParameter("password");
if (name.equals("admin") && password.equals("admin")) {
%>
<jsp:forward page="success.jsp">//跳转至success.jsp
<jsp:param name="user" value="<%=name%>" />//携带参数"user"
</jsp:forward>
<%
} else {
%>
<jsp:forward page="login.jsp">//跳转至login.jsp
<jsp:param name="user" value="<%=name%>" />//携带参数"user"
</jsp:forward>
<%
}
%>
</body>
</html>
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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB18030">
<title>Success</title>
</head>
<body>
Welcome,<%=request.getParameter("user")%>//得到参数"user"
</body>
</html>
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