打开conf/server.xml文件可以看到：

<!-- Define a non-SSL HTTP/1.1 Connector on port 8080 -->
    <Connector
port="8080"               maxHttpHeaderSize="8192"
               maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
               enableLookups="false" redirectPort="8443" acceptCount="100"
               connectionTimeout="20000" disableUploadTimeout="true" />
    <!-- Note : To disable connection timeouts, set connectionTimeout value
     to 0 -->

<!-- Note : To use gzip compression you could set the following properties :

      compression="on" 
      compressionMinSize="2048" 
      noCompressionUserAgents="gozilla, traviata" 
      compressableMimeType="text/html,text/xml"
-->

要使用gzip压缩功能，可以在Connector实例中加上如下属性:

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&<60;
4) compressableMimeType="text/html,text/xml" 压缩类型

修改完成后

<Connector
port="8080"               maxHttpHeaderSize="8192"
               maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
               enableLookups="false" redirectPort="8443" acceptCount="100"
               connectionTimeout="20000" disableUploadTimeout="true"
      compression="on"
compressionMinSize="2048"
noCompressionUserAgents="gozilla,traviata" 
compressableMimeType="text/html,text/xml,text/javascript,text/css,text/plain" />

即在Connector里面增加红色部分即可。