301重定向技术：（转自：http://www.jetdown.com/Article/118/Jet_Article_37861_1.html）
使用 Response.Redirect "51windows.asp" 转向方法的HTTP Status Code 为302
下面是301转向的代码：
asp:
Response.Status="301 Moved Permanently"
Response.AddHeader "Location", "http://www.51windows.net/"
Response.End
Php:
header("HTTP/1.1 301 Moved Permanently");
header("Location：http://www.51windows.net/);
exit();
ASP.NET:
<script runat="server">
private void Page_Load(object sender, System.EventArgs e)
{
Response.Status = "301 Moved Permanently";
Response.AddHeader("Location","http://www.51windows.net/);
}
</script>
jsp如何实现网页的重定向 (转摘自：http://www.designxf.com/Article/200509/1639.htm)
更新时间：2005-9-22 责任编辑：Jacky 资讯来源：网络采集 阅读次数：63
先锋设计联盟 Http://Www.Designxf.com Http://Www.designunion.cn
1．可以使用：
response.sendRedirect("http://www.foo.com/path/error.html");
2．可以手工修改HTTP header的Location属性，如下：
＜%
response.setStatus(HttpServletResponse.SC_MOVED_PERMANENTLY);
String newLocn = "/newpath/index.html";
response.setHeader("Location",newLocn);
%＞
3．也可以使用forward:
＜jsp:forward page="/newpage.jsp" /＞
请注意：只能在任何输出还没有发送到客户端之前使用这种方式。
5.6 类似global.asa的做法
在javascript/" target="_blank">JSP中没有global.asa的对应物。但可以有一个workaround来运行。例如，如果你需要存储或存取application scope变量，你总是可以创建一个Javabean，并在页面中需要这些变量的地方将它包含进来。
＜jsp:useBean id="globals" scope="application" class="com.xxx.GlobalBean"/＞
但是，也有一些产品具有这样的对应：
Allaire公司的产品JRun 3.0将提供global.jsa。JRun 2.3.3仍然给予支持，但只对javascript/" target="_blank">JSP 0.92。当JRun 3.0最终推出时它将支持用于javascript/" target="_blank">JSP 1.0和1.1的global.jsa。
你可以从http://beta.allaire.com/jrun30得到JRun 3.0 beta 5
另外，Oracle的javascript/" target="_blank">JSP支持globals.jsa。
Dynamic URLs vs. Static URLs
http://www.webconfs.com/dynamic-urls-vs-static-urls-article-3.php
Dynamic URLs vs. Static URLs
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The Issue at Hand
Websites that utilize databases which can insert content into a webpage by way of a dynamic script like PHP or JavaScript are increasingly popular. This type of site is considered dynamic. Many websites choose dynamic content over static content. This is because if a website has thousands of products or pages, writing or updating each static by hand is a monumental task.
There are two types of URLs: dynamic and static. A dynamic URL is a page address that results from the search of a database-driven web site or the URL of a web site that runs a script. In contrast to static URLs, in which the contents of the web page stay the same unless the changes are hard-coded into the HTML, dynamic URLs are generated from specific queries to a site's database. The dynamic page is basically only a template in which to display the results of the database query. Instead of changing information in the HTML code, the data is changed in the database.
But there is a risk when using dynamic URLs: search engines don't like them. For those at most risk of losing search engine positioning due to dynamic URLs are e-commerce stores, forums, sites utilizing content management systems and blogs like Mambo or WordPress, or any other database-driven website. Many times the URL that is generated for the content in a dynamic site looks something like this:
http://www.somesites.com/forums/thread.php?threadid=12345&sort=date
A static URL on the other hand, is a URL that doesn't change, and doesn't have variable strings. It looks like this:
http://www.somesites.com/forums/the-challenges-of-dynamic-urls.htm
Static URLs are typically ranked better in search engine results pages, and they are indexed more quickly than dynamic URLs, if dynamic URLs get indexed at all. Static URLs are also easier for the end-user to view and understand what the page is about. If a user sees a URL in a search engine query that matches the title and description, they are more likely to click on that URL than one that doesn't make sense to them.
A search engine wants to only list pages its index that are unique. Search engines decide to combat this issue by cutting off the URLs after a specific number of variable strings (e.g.: ? & =).
For example, let's look at three URLs:
http://www.somesites.com/forums/thread.php?threadid=12345&sort=date
http://www.somesites.com/forums/thread.php?threadid=67890&sort=date
http://www.somesites.com/forums/thread.php?threadid=13579&sort=date
All three of these URLs point to three different pages. But if the search engine purges the information after the first offending character, the question mark (?), now all three pages look the same:
http://www.somesites.com/forums/thread.php
http://www.somesites.com/forums/thread.php
http://www.somesites.com/forums/thread.php
Now, you don't have unique pages, and consequently, the duplicate URLs won't be indexed.
Another issue is that dynamic pages generally do not have any keywords in the URL. It is very important to have keyword rich URLs. Highly relevant keywords should appear in the domain name or the page URL. This became clear in a recent study on how the top three search engines, Google, Yahoo, and MSN, rank websites.
The study involved taking hundreds of highly competitive keyword queries, like travel, cars, and computer software, and comparing factors involving the top ten results. The statistics show that of those top ten, Google has 40-50% of those with the keyword either in the URL or the domain; Yahoo shows 60%; and MSN has an astonishing 85%! What that means is that to these search engines, having your keywords in your URL or domain name could mean the difference between a top ten ranking, and a ranking far down in the results pages.
The Solution
So what can you do about this difficult problem? You certainly don't want to have to go back and recode every single dynamic URL into a static URL. This would be too much work for any website owner.
If you are hosted on a Linux server, then you will want to make the most of the Apache Mod Rewrite Rule, which is gives you the ability to inconspicuously redirect one URL to another, without the user's (or a search engine's) knowledge. You will need to have this module installed in Apache; for more information, you can view the documentation for this module here. This module saves you from having to rewrite your static URLs manually.
How does this module work? When a request comes in to a server for the new static URL, the Apache module redirects the URL internally to the old, dynamic URL, while still looking like the new static URL. The web server compares the URL requested by the client with the search pattern in the individual rules.
For example, when someone requests this URL:
http://www.somesites.com/forums/the-challenges-of-dynamic-urls.html
The server looks for and compares this static-looking URL to what information is listed in the .htaccess file, such as:
RewriteEngine on
RewriteRule thread-threadid-(.*)\.htm$ thread.php?threadid=$1
It then converts the static URL to the old dynamic URL that looks like this, with no one the wiser:
http://www.somesites.com/forums/thread.php?threadid=12345
You now have a URL that only will rank better in the search engines, but your end-users can definitely understand by glancing at the URL what the page will be about, while allowing Apache's Mod Rewrite Rule to handle to conversion for you, and still keeping the dynamic URL.
If you are not particularly technical, you may not wish to attempt to figure out the complex Mod Rewrite code and how to use it, or you simply may not have the time to embark upon a new learning curve. Therefore, it would be extremely beneficial to have something to do it for you. This URL Rewriting Tool can definitely help you. What this tool does is implement the Mod Rewrite Rule in your .htaccess file to secretly convert a URL to another, such as with dynamic and static ones.
With the URL Rewriting Tool, you can opt to rewrite single pages or entire directories. Simply enter the URL into the box, press submit, and copy and paste the generated code into your .htaccess file on the root of your website. You must remember to place any additional rewrite commands in your .htaccess file for each dynamic URL you want Apache to rewrite. Now, you can give out the static URL links on your website without having to alter all of your dynamic URLs manually because you are letting the Mod Rewrite Rule do the conversion for you, without JavaScript, cloaking, or any sneaky tactics.
Another thing you must remember to do is to change all of your links in your website to the static URLs in order to avoid penalties by search engines due to having duplicate URLs. You could even add your dynamic URLs to your Robots Exclusion Standard File (robots.txt) to keep the search engines from spidering the duplicate URLs. Regardless of your methods, after using the URL Rewrite Tool, you should ideally have no links pointing to any of your old dynamic URLs.
You have multiple reasons to utilize static URLs in your website whenever possible. When it's not possible, and you need to keep your database-driven content as those old dynamic URLs, you can still give end-users and search engine a static URL to navigate, and all the while, they are still your dynamic URLs in disguise. When a search engine engineer was asked if this method was considered "cloaking", he responded that it indeed was not, and that in fact, search engines prefer you do it this way. The URL Rewrite Tool not only saves you time and energy by helping you use static URLs by converting them transparently to your dynamic URLs, but it will also save your rankings in the search engines.
按你说的做了,怎么不管用呀?
按你说的做了,怎么不管用呀?
我不知道你按我说的什么方法做的。我现在知道（和已经用了）怎么在jsp程序中用程序的方法实现301重定向。但是asp，php没有试过。
而301永久性重定向和302临时性重定向的研究(转帖)中提到的在服务端作设置实现301重定向我也正在探索中。。。
ps:欢迎来到JAVA学习日记，我到你的博客上去看了，不错。