背景：
HTTP?壓縮可以大大提高瀏覽網站的速度，它的原理是，在客戶端請求網頁后，從服務器端將網頁文件壓縮，再下載到客戶端，由客戶端的瀏覽器負責解壓縮并瀏覽。相對于普通的瀏覽過程HTML ,CSS,Javascript , Text?，它可以節省40%左右的流量。更為重要的是，它可以對動態生成的，包括CGI、PHP , JSP , ASP , Servlet,SHTML等輸出的網頁也能進行壓縮，壓縮效率驚人
一，對于Tomcat5.0以后的版本是支持對輸出內容進行壓縮的. 使用的是gzip壓縮格式
下面是tomcat5.5.20 中的$tomcat_home$/conf/server.xml的原內容
?1
????
<
Connector?
port
="80"
?maxHttpHeaderSize
="8192"
?2
???????????????maxThreads
="150"
?minSpareThreads
="25"
?maxSpareThreads
="75"
?3
???????????????enableLookups
="false"
?redirectPort
="8443"
?acceptCount
="100"
?4
???????????????connectionTimeout
="20000"
?disableUploadTimeout
="true"
?URIEncoding
="utf-8"
?
/>
?5
????
<!--
?Note?:?To?disable?connection?timeouts,?set?connectionTimeout?value
?6
?????to?0?
-->
?7
????
?8
????
<!--
?Note?:?To?use?gzip?compression?you?could?set?the?following?properties?:
?9
????
10
???????????????compression="on"?
11
???????????????compressionMinSize="2048"?
12
???????????????noCompressionUserAgents="gozilla,?traviata"?
13
???????????????compressableMimeType="text/html,text/xml"
14
????
-->
從上面的
第8行內容可以看出，要使用gzip壓縮功能，你可以在Connector實例中加上如下屬性即可
1) compression="on" 打開壓縮功能
2) compressionMinSize="2048" 啟用壓縮的輸出內容大小，這里面默認為2KB
3) noCompressionUserAgents="gozilla, traviata" 對于以下的瀏覽器，不啟用壓縮?
4) compressableMimeType="text/html,text/xml" 壓縮類型
我這里的配置內容為：
?1????<Connector?port="80"?maxHttpHeaderSize="8192"
?2???????????????maxThreads="150"?minSpareThreads="25"?maxSpareThreads="75"
?3???????????????enableLookups="false"?redirectPort="8443"?acceptCount="100"
?4???????????????connectionTimeout="20000"?disableUploadTimeout="true"?URIEncoding="utf-8"
?5??????????????????compression="on"?
?6???????????????compressionMinSize="2048"?
?7???????????????noCompressionUserAgents="gozilla,?traviata"?
?8???????????????compressableMimeType="text/html,text/xml,text/javascript,text/css,text/plain"??/>
?9????<!--?Note?:?To?disable?connection?timeouts,?set?connectionTimeout?value
10?????to?0?-->
11????
12????<!--?Note?:?To?use?gzip?compression?you?could?set?the?following?properties?:
13????
14???????????????compression="on"?
15???????????????compressionMinSize="2048"?
16???????????????noCompressionUserAgents="gozilla,?traviata"?
17???????????????compressableMimeType="text/html,text/xml"
18????-->
19 二，對于Apache而言，有兩種情況
???１）針對Apache2.0之前的版本，它原本是不支持的，不過可以通過添加第三方的module_gzip模塊來啟用
???２）針對Apache2.0及之后的版本，Apache提供支持, 不過不叫gzip，而叫mod_deflate
下面就對Apache2.0及之后的版本作一個說明
1) 去掉#LoadModule headers_module modules/mod_headers.so前面的注釋#,
2) 添加LoadModule deflate_module modules/mod_deflate.so
3) 在VirtualHost中添加
1????<Location?"/">
2????????SetOutputFilter?DEFLATE
3????????BrowserMatch?^Mozilla/4?gzip-only-text/html
4????????BrowserMatch?^Mozilla/4\.0[678]?no-gzip
5????????BrowserMatch?\bMSIE?!no-gzip?!gzip-only-text/html
6????????SetEnvIfNoCase?Request_URI?\.(?:gif|jpe?g|png)$?no-gzip?dont-vary
7????????Header?append?Vary?User-Agent?env=!dont-vary
8????</Location>
9 我這里面有一個完整的演示
?1#?加載deflate模塊
?2LoadModule?headers_module?modules/mod_headers.so
?3LoadModule?deflate_module?modules/mod_deflate.so
?4<VirtualHost?*:80>
?5????DocumentRoot?f:/apacheTest
?6????<Location?"/">
?7????????SetOutputFilter?DEFLATE
?8????????BrowserMatch?^Mozilla/4?gzip-only-text/html
?9????????BrowserMatch?^Mozilla/4\.0[678]?no-gzip
10????????BrowserMatch?\bMSIE?!no-gzip?!gzip-only-text/html
11????????SetEnvIfNoCase?Request_URI?\.(?:gif|jpe?g|png)$?no-gzip?dont-vary
12????????Header?append?Vary?User-Agent?env=!dont-vary
13????</Location>
14</VirtualHost>