关于request.setAttribute多页传值，多页取值

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request的setAttribute方法确实能够多页传值和多页取值的，因为request完成的是服务器跳转，在这期间所有设置的内容会被保存下来。下面的例子包含4个页面，1page.jsp和2page.jsp完成的是页面多次传值，3page.sjp和4page.jsp完成的是页面多次取值，直到页面显示出来，url一直是1page.jsp，说明这是服务器跳转。

1page.jsp

<%@ page contentType="text/html; charset=utf-8" language="java" import="java.sql.*" errorPage="" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>无标题文档</title></head>  <%    request.setAttribute("name","zhangsan");  %><body>  <jsp:forward page="2page.jsp"/></body></html>

2page.jsp

<%@ page contentType="text/html; charset=utf-8" language="java" import="java.sql.*" errorPage="" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>无标题文档</title></head><body>  <jsp:forward page="3page.jsp"/></body></html>

3page.jsp

<%@ page contentType="text/html; charset=utf-8" language="java" import="java.sql.*" errorPage="" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>无标题文档</title></head><body>  <%=request.getAttribute("name")%>    <jsp:forward page="4page.jsp"/></body></html>

4page.jsp

<%@ page contentType="text/html; charset=utf-8" language="java" import="java.sql.*" errorPage="" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>无标题文档</title></head><body>  <%=request.getAttribute("name")+" in 4page.jsp"%></body></html>

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