本文實例分析了JSP中param標簽用法。分享給大家供大家參考，具體如下：
Jsp中param標簽的使用
<jsp:param>操作被用來以"名-值"對的形式為其他標簽提供附加信息。它和<jsp:include>、<jsp:forward>、<jsp:plugin>一起使用，方法如下：
其中，name為與屬性相關聯的關鍵詞，value為屬性的值。
1．<jsp:param>與<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">//加載come.jsp <jsp:param name="number" value="<%=i%>" />//傳遞參數</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> <%//獲得includeAction.jsp傳來的值: String str = request.getParameter("number");double n = Double.parseDouble(str);%> The value form includeAction is:<br> <%=n%></Font></body></html>2．<jsp:param>與<jsp:forward>配合使用
用戶登錄示例
login.jsp
<html><head> <meta http-equiv="Content-Type" content="text/html; charset=GB18030"> <title>Login</title></head><body> //由 checklogin.jsp處理表單數據 <form action="checklogin.jsp" method="get"> <table> <tr> <td>Username:</td> <td> //獲得參數"user"，初始值為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> <% //與login.jsp中name="username"對應 String name = request.getParameter("username"); //與login.jsp中name="password"對應String password = request.getParameter("password"); if (name.equals("admin") && password.equals("admin")) { %> <jsp:forward page="success.jsp">//跳轉至success.jsp <jsp:param name="user" value="<%=name%>" />//攜帶參數"user" </jsp:forward> <% } else { %> <jsp:forward page="login.jsp">//跳轉至login.jsp <jsp:param name="user" value="<%=name%>" />//攜帶參數"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")%>//獲得參數"user"</body></html>希望本文所述對大家JSP程序設計有所幫助。
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