1.判断字符串是否仅为数字:1用JAVA自带的函数public static boolean isNumeric(String str){  for (int i  str.length();i0;){      if (!Character.isDigit(str.charAt(i))){

一、MyBatisPlus介绍 转自mybatisplus官网下方附有mybatisplus官方网站!(https://oscimg.oschina.net/oscnet/da1f3c9b055919a762fbaa48628c9274833.jpg)MyBatisPlus（简称MP）是一个 MyBatis 的增强工具，在MyBat

本文转自明一AR开发者论坛(https://www.oschina.net/action/GoToLink?urlhttp%3A%2F%2Fmobile.ardever.com%2Fread175)metaio提供了以下几种扫描方式：1\.OpticalTracking（视觉类型的扫描）1.  IDM

1importredis2rredis.Redis(host'211.149.xxx.xx',port6379,password'123456',db1)3setgetdeletesetex都是针对string类型的kv4r.set('louis_session','20

转Map时要考虑Map的key是否重复List<Entity转为Map<keyField,valueField将一个List实体集合转换为以Entity某一个字段为key,另一字段为value映射的Map/

转自http://www.blogjava.net/ctguzhupan/archive/2006/04/26/63177.html(https://www.oschina.net/action/GoToLink?urlhttp%3A%2F%2Fwww.blogjava.net%2Fctguzhupan%2Farchive%2F2006%2F04%2F

Kafka设计与原理详解 一、Kafka简介本文综合了我之前写的kafka相关文章，可作为一个全面了解学习kafka的培训学习资料。1转载请注明出处: 本文链接(https://www.oschina.net/action/GoToLink?urlhttp%

function_M.ipToInt(str)localnum0ifstrandtype(str)"string"thenlocalo1,o2,o3,o4str:match("(%d)%.(%d)%.(%d)%.(%d)")num2^24o1

转自：https://www.cnblogs.com/cc11001100/p/9043946.html(https://www.oschina.net/action/GoToLink?urlhttps%3A%2F%2Fwww.cnblogs.com%2Fcc11001100%2Fp%2F9043946.html)Hive中collect相关的函数

前言 转自 https://www.cnblogs.com/xrq730/p/5060921.html(https://www.oschina.net/action/GoToLink?urlhttps%3A%2F%2Fwww.cnblogs.com%2Fxrq730%2Fp%2F5060921.html)40个问题汇总1