Jsp获取Java的重定向赋值（String）
Java代码片段：
//传递String
request.setAttribute("msg", msg);
//重定向
request.getRequestDispatcher("error.jsp").forward(request, response);
Jsp代码片段：
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<%@ page import="nc.xyzq.uuib.bean.AuthReqBean" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<base href="<%=basePath%>">
<title>404页面</title>
<script type="text/javascript" src="<%= path %>/scripts/jquery-1.7.2.min.js"></script>
<%
String msg = (String)request.getAttribute("msg");
%>
</head>
<body>
<input id="fbi_gjzxt" type="button" name="fbi_gjzxt" value ="<%=msg %>"/>
<center>
<img src="data:images/error404.png">
</center>
</body>
</html>
String msg = (String)request.getAttribute("msg");//强制转换为String