给Tomcat，Apache配置gzip压缩(HTTP压缩)功能
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，压缩效率惊人常见的压缩方式：程序实现，在服务器端实现，今天要说的是如何在服务器端实现。
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
Xml代码 http://lianj-lee.iteye.com/javascripts/syntaxhighlighter/clipboard_new.swf?clipboard=%3CConnector%20port%3D%2280%22%20maxHttpHeaderSize%3D%228192%22%20maxThreads%20%3D%22150%22%20%20minSpareThreads%3D%2225%22%20maxSpareThreads%3D%2275%22%20enableLookups%3D%22false%22%20%20redirectPort%3D%228443%22%20acceptCount%3D%22100%22%20connectionTimeout%3D%2220000%22%20%20disableUploadTimeout%3D%22true%22%20URIEncoding%3D%22utf-8%22%2F%3E%20%0A%3C!--%20%20Note%3A%20To%20disable%20connection%20timeouts%2C%20set%20connectionTimeout%20value%20to%200%20%20--%3E%20%0A%20%20%0A%3C!--%20%20Note%3A%20To%20use%20gzip%20compression%20you%20could%20set%20the%20following%20properties%20%3A%0Acompression%3D%22on%22%20compressionMinSize%3D%222048%22%20noCompressionUserAgents%3D%22gozilla%2C%20traviata%22%20compressableMimeType%3D%22text%2Fhtml%2Ctext%2Fxml%22%0A%20--%3E%20
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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：
Xml代码 http://lianj-lee.iteye.com/javascripts/syntaxhighlighter/clipboard_new.swf?clipboard=%3CConnector%20port%3D%2280%22%20maxHttpHeaderSize%3D%228192%22%20maxThreads%3D%22150%22%20minSpareThreads%3D%2225%22%20maxSpareThreads%3D%2275%22%20enableLookups%3D%22false%22%20redirectPort%3D%228443%22%20acceptCount%3D%22100%22%20connectionTimeout%3D%2220000%22%20disableUploadTimeout%3D%22true%22%20URIEncoding%3D%22utf-8%22%20compression%3D%22on%22%20%0AcompressionMinSize%3D%222048%22%20noCompressionUserAgents%3D%22gozilla%2C%20traviata%22%20%0AcompressableMimeType%3D%22text%2Fhtml%2Ctext%2Fxml%2Ctext%2Fjavascript%2Ctext%2Fcss%2Ctext%2Fplain%22%20%20%2F%3E%0A%0A%3C!--%20Note%20%3A%20To%20disable%20connection%20timeouts%2C%20set%20connectionTimeout%20value%20to%200%20--%3E%20%20%20%20%20%0A%3C!--%20Note%20%3A%20To%20use%20gzip%20compression%20you%20could%20set%20the%20following%20properties%20%3A%20%20%20%20%0Acompression%3D%22on%22%20compressionMinSize%3D%222048%22%20%20noCompressionUserAgents%3D%22gozilla%2C%20traviata%22%20compressableMimeType%3D%22text%2Fhtml%2Ctext%2Fxml%22%0A%20--%3E
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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
Xml代码 http://lianj-lee.iteye.com/javascripts/syntaxhighlighter/clipboard_new.swf?clipboard=%3CLocation%20%22%2F%22%3E%0A%20%20SetOutputFilter%20DEFLATE%0A%20%20BrowserMatch%20%5EMozilla%2F4%20gzip-only-text%2Fhtml%0A%20%20BrowserMatch%20%5EMozilla%2F4%5C.0%5B678%5D%20no-gzip%0A%20%20BrowserMatch%20%5CbMSIE%20!no-gzip%20!gzip-only-text%2Fhtml%0A%20%20SetEnvIfNoCase%20Request_URI%20%5C.(%3F%3Agif%7Cjpe%3Fg%7Cpng)%24%20no-gzip%20dont-vary%0A%20%20Header%20append%20Vary%20User-Agent%20env%3D!dont-vary%0A%3C%2FLocation%3E
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[*]SetOutputFilter DEFLATE
[*]BrowserMatch ^Mozilla/4 gzip-only-text/html
[*]BrowserMatch ^Mozilla/4\.0 no-gzip
[*]BrowserMatch \bMSIE !no-gzip !gzip-only-text/html
[*]SetEnvIfNoCase Request_URI \.(?:gif|jpe?g|png)$ no-gzip dont-vary
[*]Header append Vary User-Agent env=!dont-vary
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我这里面有一个完整的演示
Xml代码 http://lianj-lee.iteye.com/javascripts/syntaxhighlighter/clipboard_new.swf?clipboard=%23%20%E5%8A%A0%E8%BD%BDdeflate%E6%A8%A1%E5%9D%97%0ALoadModule%20headers_module%20modules%2Fmod_headers.so%0ALoadModule%20deflate_module%20modules%2Fmod_deflate.so%0A%3CVirtualHost%20*%3A80%3E%0A%20%20DocumentRoot%20f%3A%2FapacheTest%0A%20%20%3CLocation%20%22%2F%22%3E%0A%20%20%20%20SetOutputFilter%20DEFLATE%0A%20%20%20%20BrowserMatch%20%5EMozilla%2F4%20gzip-only-text%2Fhtml%0A%20%20%20%20BrowserMatch%20%5EMozilla%2F4%5C.0%5B678%5D%20no-gzip%0A%20%20%20%20BrowserMatch%20%5CbMSIE%20!no-gzip%20!gzip-only-text%2Fhtml%0A%20%20%20%20SetEnvIfNoCase%20Request_URI%20%5C.(%3F%3Agif%7Cjpe%3Fg%7Cpng)%24%20no-gzip%20dont-vary%0A%20%20%20%20Header%20append%20Vary%20User-Agent%20env%3D!dont-vary%0A%20%20%3C%2FLocation%3E%0A%3C%2FVirtualHost%3E
[*]# 加载deflate模块
[*]LoadModule headers_module modules/mod_headers.so
[*]LoadModule deflate_module modules/mod_deflate.so
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[*]DocumentRoot f:/apacheTest
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[*] SetOutputFilter DEFLATE
[*] BrowserMatch ^Mozilla/4 gzip-only-text/html
[*] BrowserMatch ^Mozilla/4\.0 no-gzip
[*] BrowserMatch \bMSIE !no-gzip !gzip-only-text/html
[*] SetEnvIfNoCase Request_URI \.(?:gif|jpe?g|png)$ no-gzip dont-vary
[*] Header append Vary User-Agent env=!dont-vary
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