我要评论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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