JSP的forward指令实战

一 jsp-forward.jsp

<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title> forward的原始页 </title>
    <meta name="website" content="http://www.crazyit.org" />
</head>
<body>
<h3>forward的原始页</h3>
<jsp:forward page="forward-result.jsp">
    <jsp:param name="age" value="29"/>
</jsp:forward>
</body>
</html>

二 forward-result.jsp

<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>forward结果页</title>
    <meta name="website" content="http://www.crazyit.org" />
</head>
<body>
<!-- 使用request内置对象获取age参数的值 -->
<%=request.getParameter("age")%>
<!-- 输出username请求参数的值 -->
<%=request.getParameter("username")%>
</body>
</html>

三 form.jsp

<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title> 提交 </title>
    <meta name="website" content="http://www.crazyit.org" />
</head>
<body>
<!-- 表单提交页面 -->
<form id="login" method="post" action="jsp-forward.jsp">
<input type="text" name="username">
<input type="submit" value="login">
</form>
</body>
</html>

四实战

五说明

执行forward指令转发请求时，客户端的请求参数不会丢失。

来源：https://blog.csdn.net/chengqiuming/article/details/100393516

标签

jsp

jsp内置对象

forward