Tomcat配置HTTP压缩功能

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　　Tomcat5.0以后的版本是支持对输出内容进行压缩的，使用的压缩格式是gzip。
　　server.xml文件
1 http://www.jzxue.com/System/uploads/allimg/090113/2142290.gif     < Connector port ="80" maxHttpHeaderSize ="8192"
2 http://www.jzxue.com/System/uploads/allimg/090113/2142290.gif                maxThreads ="150" minSpareThreads ="25" maxSpareThreads ="75"
3 http://www.jzxue.com/System/uploads/allimg/090113/2142290.gif                enableLookups ="false" redirectPort ="8443" acceptCount ="100"
4 http://www.jzxue.com/System/uploads/allimg/090113/2142290.gif                connectionTimeout ="20000" disableUploadTimeout ="true" URIEncoding ="utf-8" />
5 http://www.jzxue.com/System/uploads/allimg/090113/2142290.gif     <!-- Note : To disable connection timeouts, set connectionTimeout value
6 http://www.jzxue.com/System/uploads/allimg/090113/2142290.gif      to 0 -->
7 http://www.jzxue.com/System/uploads/allimg/090113/2142290.gif    
8 http://www.jzxue.com/System/uploads/allimg/090113/2142290.gif     <!-- Note : To use gzip compression you could set the following properties :
9 http://www.jzxue.com/System/uploads/allimg/090113/2142290.gif    
10 http://www.jzxue.com/System/uploads/allimg/090113/2142290.gif                compression="on"
11 http://www.jzxue.com/System/uploads/allimg/090113/2142290.gif                compressionMinSize="2048"
12 http://www.jzxue.com/System/uploads/allimg/090113/2142290.gif                noCompressionUserAgents="gozilla, traviata"
13 http://www.jzxue.com/System/uploads/allimg/090113/2142290.gif                compressableMimeType="text/html,text/xml"
14 http://www.jzxue.com/System/uploads/allimg/090113/2142290.gif     -->
　　以上内容可以看出，要使用gzip压缩功能，需要设置也下属性：
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
　　对于某些文本文件如log、txt等，也可以让服务器采用gzip压缩传输，修改$tomcat_home$/conf/web.xml，添加
　　<mime-mapping>
<extension>txt</extension>
<mime-type>text/txt</mime-type>
</mime-mapping>
　　修改server.xml文件的compressableMimeType="text/html,text/xml,text/txt"