Nginx.conf添加

location ~ .*\.(gif|jpg|jpeg|png|bmp|swf)$
         {
          root /webapp/tomcat7/webapps/sdws;
          if (-f $request_filename) {
           expires 1d;
           break;
           }
          }
location ~ .*\.(js|css)$
         {
          root /webapp/tomcat7/webapps/;
          if (-f $request_filename) {
           expires 1d;
           break;
           }
        }