URL跳转

<%response.sendRedirect("Pages/index.jsp"); %>  //可以跳转到另一个目录下

 

 

1.在JSP中如何执行浏览重定向?
使用如下方式即可：response.sendRedirect("http://ybwen.home.chinaren.com/index.html");
也能物理地改变HTTP HEADER属性，如下：
<%
response.setStatus(HttpServletResponse.SC_MOVED_PERMANENTLY);
String newLocn="/newpath/index.html";
response.setHeader("Location",newLocn);
%>

 

2.如何防止在JSP或SERVLET中的输出不被BROWSER保存在CACHE中?
把如下脚本加入到JSP文件的开始即可：
<%
response.setHeader("Cache-Control","no-store"); //HTTP 1.1
response.setHeader("Pragma","no-cache"); //HTTP 1.0
response.setDateHeader ("Expires", 0); //prevents caching at the proxy server
%>

3.在JSP中如何设置COOKIE?
COOKIE是作为HTTP HEADER的一部分被发送的，如下方法即可设置：
<%
Cookie mycookie = new Cookie("aName","aValue");
response.addCookie(mycookie);
%>

 

4.在JSP中如何删除一个COOKIE?
<%
Cookie killMyCookie = new Cookie("mycookie", null);
killMyCookie.setMaxAge(0);
killMyCookie.setPath("/");
response.addCookie(killMyCookie);
%>

5.如果BROWSER已关闭了COOKIES，在JSP中我如何打开SESSION来跟踪
使用URL重写即可，如下：
hello1.jsp
<%@ page session="true" %>
<%
Integer num = new Integer(100);
session.putValue("num",num);
String url =response.encodeURL("hello2.jsp");
%>
<a href="/<";%=url%>>hello2.jsp</a>

hello2.jsp
<%@ page session="true" %>
<%
Integer i= (Integer )session.getValue("num");
out.println("Num value in session is "+i.intValue());
%>


13、在JSP中能发送EMAIL吗
可以使用SUN的专用包：sun.net.smtp包。如下脚本使用SmtpClient类发送EMAIL。
<%@ page import="sun.net.smtp.SmtpClient, java.io.*" %>
<%
String from="[e-mail]";
String to="[e-mail], [e-mail]";
try{
SmtpClient client = new SmtpClient("mail.xxxxx.xxx");
client.from(from);
client.to(to);
PrintStream message = client.startMessage();
message.println("To: " + to);
message.println("Subject: Sending email from JSP!");
message.println("This was sent from a JSP page!");
message.println();
message.println("Cool! :-)");
message.println();
message.println("Good Boy");
message.println("Im in genius.com");
message.println();
client.closeServer();
}
catch (IOException e){
System.out.println("ERROR SENDING EMAIL:"+e);
}
%>