试着写写Map/Reduce程序
手头有大量网址,以文本格式存储,一行一个url,像这样: http://beijing.baixing.com/zhengzu/a232119437.html http://mall.cnki.net/magazine/Article/JCTD199507000.htm http://meishi.qq.com/shops/2847395840683387518 http://beijing.baixing.com/zhengzu/a233512411.html http://meishi.qq.com/shops/2710663397051226108 现在想按域名整理成下面这种格式: beijing.baixing.com http://beijing.baixing.com/zhengzu/a232119437.html http://beijing.baixing.com/zhengzu/a233512411.html mall.cnki.net http://mall.cnki.net/magazine/Article/JCTD199507000.htm meishi.q...