JSP中param动作的实例详解
一 语法
<jsp:param name=\”参数名\” value=\”参数值\”>
常常与<jsp:forward>一起使用，作为其子标签存在。
二 代码
1、login.jsp
<%@ page language=\”java\” import=\”java.util.*\” contentType=\”text/html; charset=utf-8\” %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+\”://\”+request.getServerName()+\”:\”+request.getServerPort()+path+\”/\”;
%>
<!DOCTYPE HTML PUBLIC \”-//W3C//DTD HTML 4.01 Transitional//EN\”>
<html>
<head>
<base href=\”<%=basePath%>\” rel=\”external nofollow\” rel=\”external nofollow\” rel=\”external nofollow\” >
<title>My JSP \’login.jsp\’ starting page</title>
<meta http-equiv=\”pragma\” content=\”no-cache\”>
<meta http-equiv=\”cache-control\” content=\”no-cache\”>
<meta http-equiv=\”expires\” content=\”0\”>
<meta http-equiv=\”keywords\” content=\”keyword1,keyword2,keyword3\”>
<meta http-equiv=\”description\” content=\”This is my page\”>
<!–
<link rel=\”stylesheet\” type=\”text/css\” href=\”styles.css\” rel=\”external nofollow\” rel=\”external nofollow\” rel=\”external nofollow\” >
–>
</head>
<body>
<h1>系统登录</h1>
<hr>
<form name=\”loginForm\” action=\”dologin.jsp\” method=\”post\”>
<table>
<tr>
<td>用户名：</td>
<td><input type=\”text\” name=\”username\”/></td>
</tr>
<tr>
<td>密码：</td>
<td><input type=\”password\” name=\”password\”/></td>
</tr>
<tr>
<td colspan=\”2\”><input type=\”submit\” value=\”登录\”/></td>
</tr>
</table>
</form>
</body>
</html>
2、dologin.jsp
<%@ page language=\”java\” import=\”java.util.*\” contentType=\”text/html; charset=utf-8\”%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+\”://\”+request.getServerName()+\”:\”+request.getServerPort()+path+\”/\”;
%>
<!DOCTYPE HTML PUBLIC \”-//W3C//DTD HTML 4.01 Transitional//EN\”>
<html>
<head>
<base href=\”<%=basePath%>\” rel=\”external nofollow\” rel=\”external nofollow\” rel=\”external nofollow\” >
<title>My JSP \’dologin.jsp\’ starting page</title>
<meta http-equiv=\”pragma\” content=\”no-cache\”>
<meta http-equiv=\”cache-control\” content=\”no-cache\”>
<meta http-equiv=\”expires\” content=\”0\”>
<meta http-equiv=\”keywords\” content=\”keyword1,keyword2,keyword3\”>
<meta http-equiv=\”description\” content=\”This is my page\”>
<!–
<link rel=\”stylesheet\” type=\”text/css\” href=\”styles.css\” rel=\”external nofollow\” rel=\”external nofollow\” rel=\”external nofollow\” >
–>
</head>
<body>
<jsp:forward page=\”user.jsp\”>
<jsp:param value=\”admin@123.net\” name=\”email\”/>
<jsp:param value=\”888888\” name=\”password\”/>
</jsp:forward>
</body>
</html>
3、user.jsp
<%@ page language=\”java\” import=\”java.util.*\” contentType=\”text/html; charset=utf-8\”%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+\”://\”+request.getServerName()+\”:\”+request.getServerPort()+path+\”/\”;
%>
<!DOCTYPE HTML PUBLIC \”-//W3C//DTD HTML 4.01 Transitional//EN\”>
<html>
<head>
<base href=\”<%=basePath%>\” rel=\”external nofollow\” rel=\”external nofollow\” rel=\”external nofollow\” >
<title>My JSP \’user.jsp\’ starting page</title>
<meta http-equiv=\”pragma\” content=\”no-cache\”>
<meta http-equiv=\”cache-control\” content=\”no-cache\”>
<meta http-equiv=\”expires\” content=\”0\”>
<meta http-equiv=\”keywords\” content=\”keyword1,keyword2,keyword3\”>
<meta http-equiv=\”description\” content=\”This is my page\”>
<!–
<link rel=\”stylesheet\” type=\”text/css\” href=\”styles.css\” rel=\”external nofollow\” rel=\”external nofollow\” rel=\”external nofollow\” >
–>
</head>
<body>
<h1>用户资料</h1>
<hr>
<%
request.setCharacterEncoding(\”utf-8\”);
String username = \”\”;
String password = \”\”;
String email = \”\”;
if(request.getParameter(\”username\”)!=null)
{
username = request.getParameter(\”username\”);
}
if(request.getParameter(\”password\”)!=null)
{
password = request.getParameter(\”password\”);
}
if(request.getParameter(\”email\”)!=null)
{
email = request.getParameter(\”email\”);
}
%>
用户名：<%=username %><br>
密码：<%=password %><br>
电子邮箱：<%=email %><br>
</body>
</html>
三 运行结果
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