sendRedirect()
response和request一樣都是jsp內置對象，request是獲取用戶的請求，response處理用戶請求。sendRedirect()函數的作用是重定向網頁，向瀏覽器發送一個特殊的Header，然后由瀏覽器來做重定向，轉到指定的頁面。下面我將創建四個頁面，首先是sex.jsp，有一個下拉列表和提交按鈕確定，選擇“男”，就跳轉到male.jsp，選擇“女”就跳轉到female.jsp，中間通過sex_action.jsp進行重定向
!-- 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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