response和request一样都是jsp内置对象,request是获取用户的请求,response处理用户请求。sendRedirect()函数的作用是重定向网页,向浏览器发送一个特殊的Header,然后由浏览器来做重定向,转到指定的页面。下面我将创建四个页面,首先是sex.jsp,有一个下拉列表和提交按钮确定,选择“男”,就跳转到male.jsp,选择“女”就跳转到female.jsp,中间通过sex_action.jsp进行重定向
!-- sex.jsp --> %@ page language="java" import="java.util.*" pageEncoding="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" > title>Sex Select's 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> form action="%=basePath%>c03/sex_action.jsp" method="post"> select name="sex"> option>男/option> option>女/option> /select> button type="submit">提交/button> /form> /body> /html>
!-- sex_action.jsp --> %@ page language="java" import="java.util.*" pageEncoding="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" > title>My JSP 'sex_action.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> % request.setCharacterEncoding("UTF-8"); String sex = request.getParameter("sex"); out.println(sex); if("男".equals(sex)) { response.sendRedirect("male.jsp"); return; } else if("女".equals(sex)) { response.sendRedirect("female.jsp"); return; } %> /body> /html>
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