sendRedirect()
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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