给Tomcat，Apache配置gzip压缩

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[网站提速] - 给Tomcat，Apache配置gzip压缩(HTTP压缩)功能
　　背景：
HTTP 压缩可以大大提高浏览网站的速度，它的原理是，在客户端请求网页后，从服务器端将网页文件压缩，再下载到客户端，由客户端的浏览器负责解压缩并浏览。相对于普通的浏览过程HTML ,CSS,Javascript , Text ，它可以节省40%左右的流量。更为重要的是，它可以对动态生成的，包括CGI、PHP , JSP , ASP , Servlet,SHTML等输出的网页也能进行压缩，压缩效率惊人

一，对于Tomcat5.0以后的版本是支持对输出内容进行压缩的.　使用的是gzip压缩格式

下面是tomcat5.5.20 中的$tomcat_home$/conf/server.xml的原内容
 1 http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif      < Connector  port ="80"  maxHttpHeaderSize ="8192"
 2 http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif               maxThreads ="150"  minSpareThreads ="25"  maxSpareThreads ="75"
 3 http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif               enableLookups ="false"  redirectPort ="8443"  acceptCount ="100"
 4 http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif               connectionTimeout ="20000"  disableUploadTimeout ="true"  URIEncoding ="utf-8"   />
 5 http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif     <!--  Note : To disable connection timeouts, set connectionTimeout value
 6 http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif     to 0  -->
 7 http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif    
 8 http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif     <!--  Note : To use gzip compression you could set the following properties :
 9 http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif    
10 http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif               compression="on" 
11 http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif               compressionMinSize="2048" 
12 http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif               noCompressionUserAgents="gozilla, traviata" 
13 http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif               compressableMimeType="text/html,text/xml"
14 http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif     -->
从上面的第8行内容可以看出，要使用gzip压缩功能，你可以在Connector实例中加上如下属性即可
1) compression="on" 打开压缩功能
2) compressionMinSize="2048" 启用压缩的输出内容大小，这里面默认为2KB
3) noCompressionUserAgents="gozilla, traviata" 对于以下的浏览器，不启用压缩 
4) compressableMimeType="text/html,text/xml"　压缩类型

我这里的配置内容为：
 1http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif    <Connector port="80" maxHttpHeaderSize="8192"
 2http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif               maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
 3http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif               enableLookups="false" redirectPort="8443" acceptCount="100"
 4http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif               connectionTimeout="20000" disableUploadTimeout="true" URIEncoding="utf-8"
 5http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif                  compression="on" 
 6http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif               compressionMinSize="2048" 
 7http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif               noCompressionUserAgents="gozilla, traviata" 
 8http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif               compressableMimeType="text/html,text/xml,text/javascript,text/css,text/plain"  />
 9http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif    <!-- Note : To disable connection timeouts, set connectionTimeout value
10http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif     to 0 -->
11http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif    
12http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif    <!-- Note : To use gzip compression you could set the following properties :
13http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif    
14http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif               compression="on" 
15http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif               compressionMinSize="2048" 
16http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif               noCompressionUserAgents="gozilla, traviata" 
17http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif               compressableMimeType="text/html,text/xml"
18http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif    -->
19http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif

二，对于Apache而言，有两种情况
   １）针对Apache2.0之前的版本，它原本是不支持的，不过可以通过添加第三方的module_gzip模块来启用
   ２）针对Apache2.0及之后的版本，Apache提供支持, 不过不叫gzip，而叫mod_deflate
下面就对Apache2.0及之后的版本作一个说明
1) 去掉#LoadModule headers_module modules/mod_headers.so前面的注释#,
2) 添加LoadModule deflate_module modules/mod_deflate.so
3) 在VirtualHost中添加
1http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif    <Location "/">
2http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif        SetOutputFilter DEFLATE
3http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif        BrowserMatch ^Mozilla/4 gzip-only-text/html
4http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif        BrowserMatch ^Mozilla/4\.0[678] no-gzip
5http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif        BrowserMatch \bMSIE !no-gzip !gzip-only-text/html
6http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif        SetEnvIfNoCase Request_URI \.(?:gif|jpe?g|png)$ no-gzip dont-vary
7http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif        Header append Vary User-Agent env=!dont-vary
8http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif    </Location>
9http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif

我这里面有一个完整的演示
 1http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif# 加载deflate模块
 2http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gifLoadModule headers_module modules/mod_headers.so
 3http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gifLoadModule deflate_module modules/mod_deflate.so
 4http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif<VirtualHost *:80>
 5http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif    DocumentRoot f:/apacheTest
 6http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif    <Location "/">
 7http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif        SetOutputFilter DEFLATE
 8http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif        BrowserMatch ^Mozilla/4 gzip-only-text/html
 9http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif        BrowserMatch ^Mozilla/4\.0[678] no-gzip
10http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif        BrowserMatch \bMSIE !no-gzip !gzip-only-text/html
11http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif        SetEnvIfNoCase Request_URI \.(?:gif|jpe?g|png)$ no-gzip dont-vary
12http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif        Header append Vary User-Agent env=!dont-vary
13http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif    </Location>
14http://yuleihome.iteye.com/blog/../../Images/OutliningIndicators/None.gif</VirtualHost>

　　出处:http://www.blogjava.net/site120/archive/2007/02/16/100073.html