前言:這幾天公司郵件伺服器老是出現一些問題,由於相關知識原來接觸不多,而且郵件伺服器又得由本人維護,因此我想很有必要學習一下相關知識了!電子郵件的兩個支柱 在這裡,我們將詳細介紹Internet電子郵件系統的原理。首先讓我們從基本觀念和概念開始:提供Internet郵政服務的程式是什麼?有哪些技術詞彙和術語? SMTP(Simple Mail Transfer
1 We must distinguish between the abstract class and the interface with them same name, beacause they have different base classes or interfaces.2 In the class and subclass of InputFormat,we should remember the unit of measurement is Block, and the
About cmake construction we need two types of files,one is like 'findlib.cmake' ,the other is 'cmakelists.txt'. the first one is used to find some lib file or some head file,the second one tell us the relation in all the directory,and make a
solr1 drill data by random,eg.&random_123 solrQuery.addSortField("random_"+rand.nextInt(1000),SolrQuery.ORDER.desc); 2 search id not equal to 222 eg.-id:222 3 deleteById(List<String> ids) in solrj we should delete anything by id As much
1 Nutch common is 'bin/nutch crawl <urlDir> [-dir d] [-threads n] [-depth i] [-topN] ', nutch will generate segment for each depth ,and topN means each layer will collect topN urls. Generally each layer has one single segment,it depends on
1 nutch的所有應該小寫2 檔案名稱不能有括弧 3 js 未結束的字串常量,連接字串時不能以"/"結尾4 js dictionary應該用() 取值,a = (new VBArray(d.Keys())).toArray();取keys5 window.open the second param cannot be decimal,may like w336 replaceAll在linux和windows環境中針對/r/n處理結果是不同的,可以分開replace或者正則replace7