Jsp中param标签的使用
@Author:ZJ 07-2-21
Blog: zhangjunhd.blog.51cto.com/
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、、一起使用，方法如下：
其中，name为与属性相关联的关键词，value为属性的值。 1.与配合使用
includeAction.jsp
| <meta http-equiv="Content-Type" content="text/html; charset=GB18030"> Include <%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> |
|---|
| come.jsp |
| <meta http-equiv="Content-Type" content="text/html; charset=GB18030"> come<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: <%=n%> |
|---|
2.与配合使用 用户登录示例
login.jsp
| <meta http-equiv="Content-Type" content="text/html; charset=GB18030"> Login //由 checklogin.jsp处理表单数据 <form action="checklogin.jsp" method="get">
| Username: | //获得参数"user"，初始值为null <input type="text" name="username" |
| ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------value=<%=request.getParameter("user") %>>
|
| Password: |
<input type="password" name="password">
|
|
<input type="submit" value="login">
|
checklogin.jsp
| <meta http-equiv="Content-Type" content="text/html; charset=GB18030"> CheckLogin <% //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>
<%
}
%>
| | -------- |success.jsp
| <meta http-equiv="Content-Type" content="text/html; charset=GB18030"> Success Welcome,<%=request.getParameter("user")%>//获得参数"user" |
|---|
| **想要了解更多点击下方链接:**www.bilibili.com/video/BV1UZ… |
| www.bilibili.com/video/BV1XZ… |
| www.bilibili.com/video/BV15u… |
