jsp中param标签的使用

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jsp中param标签的使用
@Author:ZJ 07-2-21
Blog: [url]http://zhangjunhd.blog.51cto.com/[/url]
<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:
<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
<td 230,="" 230)="" none="" repeat="" scroll="" 0%="" 50%;="" width:="" 426.1pt;="" -moz-background-clip:="" -moz-initial;="" -moz-background-origin:="" -moz-background-inline-policy:="" -moz-initial;"="" valign="top" width="568" style="padding: 0cm 5.4pt; margin: 0px; background-color: white; border: 1pt solid windowtext; ">
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=GB18030">
    <title>Include</title>
</head>
<body>
    <%double i = Math.random();%>
    <jsp:include page="login.jsp">//加载login.jsp
    <jsp:param name="number" value="<%=i%>" />//给login.jsp传递参数名为number的参数
</jsp:include>
</body>
</html>
 
login.jsp
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=GB18030">
    <title>Login</title>
</head>
<body>
     // checklogin.jsp处理表单数据
   <form action="checklogin.jsp" method="get">
        <table>
<tr>
              <td>Number</td>
              <td//从includeAction.jsp获得参数"numberr"
                  <input type="text" name="number"
                     value=<%=request.getParameter("number"%>>
              </td>
           </tr>
            <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
<td 230,="" 230)="" none="" repeat="" scroll="" 0%="" 50%;="" width:="" 426.1pt;="" -moz-background-clip:="" -moz-initial;="" -moz-background-origin:="" -moz-background-inline-policy:="" -moz-initial;"="" valign="top" width="568" style="padding: 0cm 5.4pt; margin: 0px; background-color: white; border: 1pt solid windowtext; ">
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=GB18030">
    <title>CheckLogin</title>
</head>
<body>
    <%
      //login.jspname="username"对应
       String name = request.getParameter("username");
       //login.jspname="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
<td 230,="" 230)="" none="" repeat="" scroll="" 0%="" 50%;="" width:="" 426.1pt;="" -moz-background-clip:="" -moz-initial;="" -moz-background-origin:="" -moz-background-inline-policy:="" -moz-initial;"="" valign="top" width="568" style="padding: 0cm 5.4pt; margin: 0px; background-color: white; border: 1pt solid windowtext; ">
<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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