本文实例分析了jsp中param标签用法。分享给大家供大家参考,具体如下:
jsp中param标签的使用
<jsp:param>操作被用来以"名-值"对的形式为其他标签提供附加信息。它和<jsp:include>、<jsp:forward>、<jsp:plugin>一起使用,方法如下:
复制代码 代码如下:
<jsp:param name="paramname" value="paramvalue"/>
其中,name为与属性相关联的关键词,value为属性的值。
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>
希望本文所述对大家jsp程序设计有所帮助。
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