本文實(shí)例分析了JSP中param標(biāo)簽用法。分享給大家供大家參考,具體如下:
Jsp中param標(biāo)簽的使用
jsp:param>操作被用來以"名-值"對(duì)的形式為其他標(biāo)簽提供附加信息。它和jsp:include>、jsp:forward>、jsp:plugin>一起使用,方法如下:
復(fù)制代碼 代碼如下:
jsp:param name="paramName" value="paramValue"/>
其中,name為與屬性相關(guān)聯(lián)的關(guān)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(shù)
/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(shù)據(jù)
form action="checklogin.jsp" method="get">
table>
tr>
td>Username:/td>
td> //獲得參數(shù)"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(duì)應(yīng)
String name = request.getParameter("username");
//與login.jsp中name="password"對(duì)應(yīng)
String password = request.getParameter("password");
if (name.equals("admin") password.equals("admin")) {
%>
jsp:forward page="success.jsp">//跳轉(zhuǎn)至success.jsp
jsp:param name="user" value="%=name%>" />//攜帶參數(shù)"user"
/jsp:forward>
%
} else {
%>
jsp:forward page="login.jsp">//跳轉(zhuǎn)至login.jsp
jsp:param name="user" value="%=name%>" />//攜帶參數(shù)"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(shù)"user"
/body>
/html>
希望本文所述對(duì)大家JSP程序設(shè)計(jì)有所幫助。
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