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，然後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%>">
<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%>">
<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>