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<jsp:param>动作标记的用法详解

2012-03-27 13:35 471 查看
<jsp:param>动作标记的用法详解

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

示例：
1．<jsp:param>与<jsp:include>配合使用
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>
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>
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>
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