JSP的param动作

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 %> " >

< 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" >

<!--

-->

</ 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 %> " >

< 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" >

<!--

-->

</ head >

< body >

< jsp:forward page = "user.jsp" >

< jsp:param value = " [email protected] " 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 %> " >

< 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" >

<!--

-->

</ 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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