tomcat 启用gzip压缩

替换tomcat中的connector，启用compression

<Connector connectionTimeout="20000" port="8080" protocol="HTTP/1.1" redirectPort="8443" compression="on" 
    noCompressionUserAgents="gozilla,traviata" 
    compressableMimeType="text/html,text/xml,text/javascript,text/css,text/plain,application/json,application/x-javascript,image/gif,image/jpeg,image/png,text/html,text/html,application/xhtml+xml,application/xml"
    compressionMinSize="2048" 
    />

运行结果：
未启用情况：
33 个请求  407.4 KB  (396.7 KB 来自缓存)   1.72s (onload: 2.45s)

启用后情况：
33 个请求  398.5 KB   (396.7 KB 来自缓存)  1.81s (onload: 2.72s)