jsp实例教程，<jsp:param>动作标记的用法实例源码详解。<jsp:param>与<jsp:forward>配合使用 ，<jsp:param>动作标签使用的jsp举例说：
1.<jsp:param>动作标记的语法
<jsp:param name=”attName” value=”AttValue”/> 2.<jsp:param>动作标记的作用
指定某个参数的值，必须和<jsp:forward>,<jsp:include>,<jsp:plugin> 等一起协同使用
<jsp:param>动作标记实例：
1．<jsp:param>与<jsp:include>配合使用的jsp页面源码：
<jsp:param>动作标记的用法之includeAction.jsp
<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>
<jsp:param>动作标记的用法之come.jsp
<html>
<head>
<meta http-equiv=”Content-Type” content=”text/html; charset=GB18030″>
<title>come</title>
</head>
<body bgcolor=cyan>
<Font Size=3>
<%//获得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>
2．<jsp:param>与<jsp:forward>配合使用
用户登录示例 login.jsp
<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> //获得参数”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>
<jsp:param>动作标记的用法之checklogin.jsp
<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>
success.jsp
<html> <head>
<meta http-equiv=”Content-Type” content=”text/html; charset=GB18030″>
<title>Success</title> </head>
<body>
Welcome,<%=request.getParameter(“user”)%>//获得参数”user” </body>
</html>