htaccess介绍和使用方法

.htaccess文档是很有用的，下面一篇介绍：

• Part 1 – Introduction介绍

• Part 2 - .htaccess Commande命令

• Part 3 - Password protection密码保护

Part 1 – Introduction介绍

Introduction 介绍

In this tutorial you will find out about the .htaccess file and the power it has to improve your website. Although .htaccess is only a file, it can change settings on the servers and allow you to do many different things, the most popular being able to have your own custom 404 error pages. .htaccess isn't difficult to use and is really just made up of a few simple instructions in a text file.

从本指南中，您能够学习到有关.htaccess文档及其功能，用以优化您的网站。尽管.htaccess只是个文档，但他能够更改服务器的配置， 允许您做许多不同的事情，最流行的功能是您能够创建自定义的“404 error”页面。.htaccess 并不难于应用，只是在一个text文档中添加几条简单的指令而已。

Will My Host Support It? 我的主机支持他吗？

This is probably the hardest question to give a simple answer to. Many hosts support .htaccess but don't actually publicise it and many other hosts have the capability but do not allow their users to have a .htaccess file. As a general rule, if your server runs Unix or Linux, or any version of the Apache web server it will support .htaccess, although your host may not allow you to use it.

这可能很难用简单的答案来回答。许多主机支持.htaccess但实际上并不会明确声明，许多其他类型的主机有能力但并不允许他们的用户使 用.htaccess文档。作为一般性的规则，假如您的主机使用Unix或Linux系统，或任何版本的Apache网络服务器，他一般来说是支 持.htaccess的，尽管您的主机服务器可能不允许您使用他。

A good sign of whether your host allows .htaccess files is if they support password protection of folders. To do this they will need to offer .htaccess (although in a few cases they will offer password protection but not let you use .htaccess). The best thing to do if you are unsure is to either upload your own .htaccess file and see if it works or e-mail your web host and ask them.

您的主机是否允许.htaccess，很好的一个标志是他是否支持文档夹的密码保护。为此，他们将提供.htaccess支持（尽管少数情况下他们 提供密码保护功能但不允许您使用.htaccess）。假如您不确定，最好的办法一是上传您自己的.htaccess文档看看是否有用，二是e-mail 给您的主机服务商询问。

What Can I Do? 我该怎么做？

You may be wondering what .htaccess can do, or you may have read about some of its uses but don't realise how many things you can actually do with it.

您可能疑惑.htaccess到底能做些什么，或您可能曾知道他的一些功能但并不真正了解您实际到底能够用他来做多少事情。

There is a huge range of things .htaccess can do including: password protecting folders, redirecting users automatically, custom error pages, changing your file extensions, banning users with certian IP addresses, only allowing users with certain IP addresses, stopping directory listings and using a different file as the index file.

.htaccess能够做大量范围的事情，包括：文档夹密码保护、用户自动重新指向、自定义错误页面、变更您的文档扩展名、屏蔽特定的用户IP地址、只允许特定的IP地址、停止目录表连同使用其他文档作为index文档。

Creating A .htaccess File 创建一个.htaccess文档

Creating a .htaccess file may cause you a few problems. Writing the file is easy, you just need enter the appropriate code into a text editor (like notepad). You may run into problems with saving the file. Because .htaccess is a strange file name (the file actually has no name but a 8 letter file extension) it may not be accepted on certain systems (e.g. Windows 3.1). With most operating systems, though, all you need to do is to save the file by entering the name as:

创建.htaccess文档也许会给您带来几个问题。写文档很容易，您只需要在文字编缉器（例如：写字板）里写下适当的代码。然后，您可能会碰到保 存文档的困难，因为.htaccess是个古怪的文档名（文档事实上没有文档名，只有一个由8个字母组成的扩展名），一些系统（例如windows 3.1）无法接受这样的文档名。在大多数的操作系统中，您需要做的是将文档保存成名为：

".htaccess"
(including the quotes). If this doesn't work, you will need to name it something else (e.g. htaccess.txt) and then upload it to the server. Once you have uploaded the file you can then rename it using an FTP program.

（包括引号）。假如这也不行，您需要将其命名为其他的名字（例如htaccess.txt），再将其上传到服务器上，此后您就能够利用FTP软件来重命名他了。

Warning 警告

Before beginning using .htaccess, I should give you one warning. Although using .htaccess on your server is extremely unlikely to cause you any problems (if something is wrong it simply won't work), you should be wary if you are using the Microsoft FrontPage Extensions. The FrontPage extensions use the .htaccess file so you should not really edit it to add your own information. If you do want to (this is not recommended, but possible) you should download the .htaccess file from your server first (if it exists) and then add your code to the beginning.

在使用.htaccess之前，我必须给您一些警告。尽管在服务器上使用.htaccess绝对不太可能给您带来任何麻烦（假如有些东西错了，他只 是没效用罢了），但假如您使用Microsoft FrontPage Extensions您就需要小心些。FrontPage Extensions使用了.htaccess，因此您不能编辑他，加入您自己的信息。假如您需要（并不推荐，但是可能）您应该先从服务器上下 载.htaccess文档（假如存在），之后在前面加上您的代码。

Custom Error Pages 自定义错误页

The first use of the .htaccess file which I will cover is custom error pages. These will allow you to have your own, personal error pages (for example when a file is not found) instead of using your host's error pages or having no page. This will make your site seem much more professional in the unlikely event of an error. It will also allow you to create scripts to notify you if there is an error (for example I use a PHP script on Free Webmaster Help to automatically e-mail me when a page is not found).

我想介绍的.htaccess第一个应用是自定义错误页面，这使得您能够拥有自己的、个性化的错误页面（例如很难找到文档时），而不是您的服务商提 供的错误页或没有任何页面。这会让您的网站在出错的时候看上去更加专业。您还能够利用脚本程式在发生错误的时候通知您（例如我使用Free Webmaster Help的PHP脚本程式，当很难找到页面的时候自动e-mail给我）。

You can use custom error pages for any error as long as you know its number (like 404 for page not found) by adding the following to your .htaccess file:

任何您知道代码的错误（像404很难找到页面），您都能够将其变成自定义页面，要做的只是在.htaccess文档里加入以下一段：

ErrorDocument errornumber /file.html
For example if I had the file notfound.html in the root direct
ory of my site and I wanted to use it for a 404 error I would use:

例如，假如我的根目录下有一个nofound.html文档，我想使用他作为404 error的页面：

ErrorDocument 404 /notfound.html
If the file is not in the root directory of your site, you just need to put the path to it:

假如文档不在网站的根目录下，您只需要把路径配置为：

ErrorDocument 500 /errorpages/500.html
These are some of the most common errors:

以下是一些最常用的错误：

401 - Authorization Required
400 - Bad request
403 - Forbidden
500 - Internal Server Error
404 - Wrong page
Then, all you need to do is to create a file to display when the error happens and upload it and the .htaccess file.

这样，您要做的只是生成一个错误显示文档，然后把他们上传。

Part 2 - .htaccess 命令

Introduction 介绍

In the last part I introduced you to .htaccess and some of its useful features. In this part I will show you how to use the .htaccess file to implement some of these.

上一部分中我已将您引入了.htaccess连同他的一些有用的功能，在这一部分里，我将向您演示如何应用.htaccess文档去实现这些功能。

Stop A Directory Index From Being Shown 停示显示目录索引

Sometimes, for one reason or another, you will have no index file in your directory. This will, of course, mean that if someone types the directory name into their browser, a full listing of all the files in that directory will be shown. This could be a security risk for your site.

有些时候，由于某种原因，您的目录里没有index文档，当然这样意味着假如有人在浏览器地址栏键入了该目录的路径，该目录下任何的文档都会显示出来，这造成了网站的安全威胁。

To prevent against this (without creating lots of new 'index' files, you can enter a command into your .htaccess file to stop the directory list from being shown:

为了避免这种情况（而不必创建一堆的新index文档），您能够在您的.htaccess文档中键入以下命令，用以阻止目录索引的显示：

Options -Indexes
Deny/Allow Certian IP Addresses 阻止/允许特定的IP地址

In some situations, you may want to only allow people with specific IP addresses to access your site (for example, only allowing people using a particular ISP to get into a certian directory) or you may want to ban certian IP addresses (for example, keeping disruptive memembers out of your message boards). Of course, this will only work if you know the IP addresses you want to ban and, as most people on the internet now have a dynamic IP address, so this is not always the best way to limit usage.

有些情况下，您可能只想允许某些特定IP的用户能够访问您的网站（例如：只允许使用特定ISP的用户进入某个目录），或您想拦截某些特定的IP地址 （例如：将低级用户隔离于您的信息面版外）。当然，这只在您知道您想拦截的IP地址时才有用，然而现在网上的大多数用户都使用动态IP地址，所以这并不是 限制使用的常用方法。

You can block an IP address by using:

您能够使用以下命令拦截一个IP地址：

deny from 000.000.000.000
where 000.000.000.000 is the IP address. If you only specify 1 or 2 of the groups of numbers, you will block a whole range.

被拦截的IP地址则为000.000.000.000，假如您只指定其中1或2个代码组，您能够拦截整个区域的地址。

You can allow an IP address by using:

您能够使用以下命令允许一个IP地址的访问：

allow from 000.000.000.000

where 000.000.000.000 is the IP address. If you only specify 1 or 2 of the groups of numbers, you will allow a whole range.

被允许的IP地址则为000.000.000.000，假如您只指定其中1或2个代码组，您能够允许整个区域的地址。

If you want to deny everyone from accessing a directory, you can use:

假如您想阻止任何人访问该文档目录，您能够使用：

deny from all
but this will still allow scripts to use the files in the directory.

但这将仍然允许脚本程式使用这个目录下的文档。

Alternative Index Files 替代的index文档

You may not always want to use index.htm or index.html as your index file for a directory, for example if you are using PHP files in your site, you may want index.php to be the index file for a directory. You are not limited to 'index' files though. Using .htaccess you can set foofoo.blah to be your index file if you want to!

也许您不想一直使用index.htm或index.html来作为目录的索引文档，例如您的站点使用PHP文档，您会想使用 index.php来作为该目录的索引文档。当然也不必局限于“index”文档，假如您愿意，您尽管使用foofoo.balh来作为您的索引文档！

Alternate index files are entered in a list. The server will work from left to right, checking to see if each file exists, if none of them exisit it will display a directory listing (unless, of course, you have turned this off).

替代的索引文档能够排成一个列表，服务器会从左至右进行寻找，看看哪个文档在真实的目录中存在。假如一个也很难找到，他将会把目录清单显示出来（当然除非您关闭了显示目录文档清单）。

DirectoryIndex index.php index.php3 messagebrd.pl index.html index.htm
Redirection 重新指向

One of the most useful functions of the .htaccess file is to redirect requests to different files, either on the same server, or on a completely different web site. It can be extremely useful if you change the name of one of your files but allow users to still find it. Another use (which I find very useful) is to redirect to a longer URL, for example in my newsletters I can use a very short URL for my affiliate links. The following can be done to redirect a specific file:

.htaccess其中一个极其有用的功能，就是将请求重新指向站内或站外的不同文档。当您改变了一个文档名称时但仍然想让用户仍然能够用旧链接找 到他，这个时候此功能将变得极其有用。另一个应用（我发现的很有用的）是重新指向一个长URL，例如在我的时事信息中，我能够使用一个很简短的URL来指 向我的联合链接。以下是个重新指向特定文档的例子：

Redirect /location/from/root/file.ext
In this above example, a file in the root directory called oldfile.html would be entered as:

上述的例子中，访问在root目录下的名为oldfile.html能够键入：

/oldfile.html
and a file in the old subdirectory would be entered as:

访问一个旧次级目录中的文档能够键入：

/old/oldfile.html
You can also redirect whole directoires of your site using the .htaccess file, for example if you had a directory called olddirectory on your site and you had set up the same files on a new site at: you could redirect all the files in that directory without having to specify each one:

您也能够使用.htaccess将整个网站的目录都做重新指向，假如您的网站上有一个名为olddirectory的目录，并且您已在一个新网站 上建立了和上相同的文档，您能够将旧目录下任何的文档做一次重新指向而不必一 一声明：

Redirect /olddirectory
Then, any request to your site below /olddirectory will bee redirected to the new site, with the
extra information in the URL added on, for example if someone typed in:

这样，任何指向到站点中/olddirectory的请求都将被重新指向新的站点，包括附加的额外URL信息。例如有人键入：

http://www.youroldsite.com/olddirecotry/oldfiles/images/image.gif
They would be redirected to:

请求将被重新指向到：

oldfiles/images/image.gif
This can prove to be extremely powerful if used correctly.

假如正确使用，本功能将极其强大。

Part 3 – 密码保护

Introduction 介绍

Although there are many uses of the .htaccess file, by far the most popular, and probably most useful, is being able to relaibly password protect directories on websites. Although JavaScript etc. can also be used to do this, only .htaccess has total security (as someone must know the password to get into the directory, there are no 'back doors')

尽管有各种各样的.htaccess用法，但至今最流行的也可能是最有用的做法是将其用于网站目录的可靠的密码保护。尽管JavaScrip等也能做到，但只有.htaccess具备完美的安全（即访问者必须知晓密码才能够访问目录，并且绝无“后门”可走）。

The .htaccess File

Adding password protection to a directory using .htaccess takes two stages. The first part is to add the appropriate lines to your .htaccess file in the directory you would like to protect. Everything below this directory will be password protected:

利用.htaccess将一个目录加上密码保护分两个步骤。第一步是在您的.htaccess文档里加上适当的几行代码，再将.htaccess文档放进您要保护的目录下：

AuthName "Section Name"
AuthType Basic
AuthUserFile /full/path/to/.htpasswd
Require valid-user
There are a few parts of this which you will need to change for your site. You should replace "Section Name" with the name of the part of the site you are protecting e.g. "Members Area".

有几个小部分您可能需要根据您的网站情况而修改一下。用被保护部分的名字替换掉”Section Name”，例如"Members Area"。

The /full/parth/to/.htpasswd should be changed to reflect the full server path to the .htpasswd file (more on this later). If you do not know what the full path to your webspace is, contact your system administrator for details.

另外/full/parth/to/.htpasswd 应该替换为指向.htpasswd文档（后面详述该文档）的完整服务器路径。假如您不知道您的完整路径，询问一下您的系统管理员。

The .htpasswd File

Password protecting a directory takes a little more work than any of the other .htaccess functions because you must also create a file to contain the usernames and passwords which are allowed to access the site. These should be placed in a file which (by default) should be called .htpasswd. Like the .htaccess file, this is a file with no name and an 8 letter extension. This can be placed anywhere within you website (as the passwords are encrypted) but it is advisable to store it outside the web root so that it is impossible to access it from the web.

目录的密码保护比.htaccess的其他功能要麻烦些，因为您必须同时创建一个包含用户名和密码的文档，用于访问您的网站，相关信息（默认）应位 于一个名为.htpasswd的文档里，像.htaccess相同，.htpasswd也是个没有文档名且具备8位扩展名的文档，能够放置在您网站里的任 何地方（此时密码应加密），但建议您将其保存在网站根目录外，这样通过网络就无法访问到他了。

Entering Usernames And Passwords 输入用户名和密码

Once you have created your .htpasswd file (you can do this in a standard text editor) you must enter the usernames and passwords to access the site. They should be entered as follows:

创建好.htpasswd文档后（能够通过文字编辑器创建），下一步是输入用于访问网站的用户名和密码，应为：

username:password
where the password is the encrypted format of the password. To encrypt the password you will either need to use one of the premade scripts available on the web or write your own. There is a good username/password service at the KxS site which will allow you to enter the user name and password and will output it in the correct format.

“password”的位置应该是加密过的密码。您能够通过几种方法来得到加密过的密码：一是使用一个网上提供的permade脚本或自己写一个； 另一个很不错的username/password加密服务是通过KxS网站，这里允许您输入用户名及密码，然后生成正确格式的密码。

For multiple users, just add extra lines to your .htpasswd file in the same format as the first. There are even scripts available for free which will manage the .htpasswd file and will allow automatic adding/removing of users etc.

对于多用户，您只需要在.htpasswd文档中新增同样格式的一行即可。另外更有一些免费的脚本程式能够方便地管理.htpasswd文档，能够自动新增/移除用户等。

Accessing The Site 访问网站

When you try to access a site which has been protected by .htaccess your browser will pop up a standard username/password dialog box. If you don't like this, there are certain scripts available which allow you to embed a username/password box in a website to do the authentication. You can also send the username and password (unencrypted) in the URL as follows:

当您试图访问被.htaccess密码保护的目录时，您的浏览器会弹出标准的username/password对话窗口。假如您不喜欢这种方式， 有些脚本程式能够允许您在页面内嵌入username/password输入框来进行认证，您也能够在浏览器的URL框内以以下方式输入用户名和密码（未 加密的）：

Summary 小结

.htaccess is one of the most useful files a webmaster can use. There are a wide variety of different uses for it which can save time and increase security on your website.

.htaccess是个站点管理员能够应用的一个强大的工具，有更多的变化以适应不同的用途，能够节约时间及提高网站的安全性。