開啓tomcat的gzip

<Connector 
  port="80" 
  protocol="HTTP/1.1"
  connectionTimeout="20000"
  redirectPort="8443" 
  compression="on" 
  compressionMinSize="2048" 
  noCompressionUserAgents="gozilla,traviata" 
  compressableMimeType="text/html,text/xml,text/javascript,text/css,text/plain,application/xhtml+xml,application/xml,application/json,application/javascript"
/>