除了投诉之外，怎么才能更有效地阻止联通的劫持呢？最近深受联通的广告劫持困扰，一开始是在页面的左下角弹出虚假广告，这直接导致G-zip压缩的页面变成下载、页面内的javascript失效或https连接中断，必须重新刷新才可访问。现在劫持手段变成一个jsp程序了，即劫持到一个他专门的广告页面上，等待几秒之后再跳转到原来的页面上，这使得需要提交表格信息的页面提交失败，十分的耗时。已知这不是电脑病毒引起的，因为包括iPad和iPhone通过safari访问http协议的网站都会出现这种情况。查询网页源代码，劫持的页面所在的服务器位于221.204.213.27而对于221.204.213.27这个IP来看，查询WHOIS信息如下WHOIS Results for：221.204.213.27% [whois.apnic.net node-4]% Whois data copyright terms apnic.net/db/dbcopy...inetnum: 221.204.0.0 - 221.205.255.255netname: UNICOM-SXdescr: China Unicom Shanxi Province Networkdescr: China Unicomcountry: CNadmin-c: CH1302-APtech-c: XH63-APremarks: service providermnt-by: APNIC-HMmnt-lower: MAINT-CNCGROUP-SXmnt-routes: MAINT-CNCGROUP-RRstatus: ALLOCATED PORTABLEremarks: This object can only be modified by APNIC hostmasterremarks: If you wish to modify this object details pleaseremarks: send email to hostmaster@apnic.net with your organisationremarks: account name in the subject line.changed: hm-changed@apnic.net 20030702changed: hm-changed@apnic.net 20060124changed: hm-changed@apnic.net 20090508source: APNICroute: 221.204.0.0/15descr: CNC Group CHINA169 Shanxi Province Networkcountry: CNorigin: AS4837mnt-by: MAINT-CNCGROUP-RRchanged: abuse@cnc-noc.net 20060118source: APNICperson: ChinaUnicom Hostmasternic-hdl: CH1302-APe-mail: abuse@chinaunicom.cnaddress: No.21,Jin-Rong Streetaddress: Beijing,100140address: P.R.Chinaphone: 86-10-66259940fax-no: 86-10-66259764country: CNchanged: abuse@chinaunicom.cn 20090408mnt-by: MAINT-CNCGROUPsource: APNICperson: xuehong hanaddress: BingZhou North Road YouDian Front Street NO.2 ShanXi Data Communciation Bureau TaiYuan ShanXi Chinacountry: CNphone: 86-351-4091749fax-no: 86-351-4088347e-mail: hxh@public.ty.sx.cnnic-hdl: XH63-APmnt-by: MAINT-CHINANET-SXchanged: hxh@public.ty.sx.cn 20010208source: APNIC可以得出221.204.213.27这个IP地址是属于联通旗下的。所以请求网络专家支招，如何避免劫持，怎么把被劫持的页面劫持回来。