解决nutch 1.9在cgywin中运行报Injector: java.io.IOException: Failed to set permissions of path: \tmp\hadoop-Administrator\mapred\staging\Administrator139727905\.staging to 0700错误的问题，即修改hadoop-core-1.2.0.jar中FileUtil.java类中checkReturnValue方法后jar包

Java 核心技术 第10版，包括卷一和卷二，具体的： 1. Core.Java.Volume.I.Fundamentals.10th.Edition 2. Core.Java.Volume.II-Advanced.Features.10th.Edition

该项目博客园一个网友开源的，站长认为该项目是国内.net core 后台管理功能做的最好的开源项目！之前从dotnet core 1.1开始，升级到2.0，乃至如今2.1。 项目git仓库：https://github.com/hogenwang/comcms_core 演示地址：http://123.207.59.192/AdminCP 账号密码都是admin .net core 2.1 mvc 数据库：Mysql 5.7 数据库操作使用：XCode，目前支持mysql、sqlserver。详细见：https://github.com/NewLifeX/X 目前数据库驱动使用：MySqlConnector 后台模板是H 编辑器采用CKeditor 支持截图粘贴进去，上传图片采用webuploader   项目大概介绍： COMCMS.API 目前还没用到，预留api的第三对接类库 COMCMS.Common 通用帮助函数类库 COMCMS.Core 数据库操作核心业务逻辑和实体 采用XCode COMCMS.Web .net core 2.1 的MVC网站。 XCoder 代码生成器，跟上述的没任何关系，只是为了生成数据库操作业务逻辑和实体而已。 截图：

dotnetcoredemo 第一个.NET Core演示应用程序

windows系统利用docker安装omni core及以太坊公链

蓝牙核心协议定义书，包括蓝牙协议栈的分层、消息格式定义，消息定义等内容 Use of this specification is your acknowledgement that you agree to and will comply with the following notices and disclaimers. You are advised to seek appropriate legal, engineering, and other professional advice regarding the use, interpretation, and effect of this specification. Use of Bluetooth specifications by members of Bluetooth SIG is governed by the membership and other related agreements between Bluetooth SIG and its members, including those agreements posted on Bluetooth SIG’s website located at www.bluetooth.com. Any use of this specification by a member that is not in compliance with the applicable membership and other related agreements is prohibited and, among other things, may result in (i) termination of the applicable agreements and (ii) liability for infringement of the intellectual property rights of Bluetooth SIG and its members.

压缩包里面包含了最新的bluetooth 协议完整描述，包括BLE 2M。对研究蓝牙PHY，MAC层有参考意义

ServiceStack.Redis-5.9.3.0 已去除6000次/小时限制，可直接应用.net core,将压缩包文件引用至项目中，亲自测试，100%有效，可应用用.net core 2.0 .net core 3.1 .net framework 4.0及以上

Account：net core Web API类型，为前端提供Rest服务 Account.Common：公共工程，与具体业务无关，目前里边仅仅有两个类，自定义业务异常类及错误码枚举类 Account.Entity：这个不要问我 Account.Repository.Contract：仓储契约，一般用于隔离服务层与具体的仓储实现。做隔离的目的是因为与仓储实现直接依赖的数据访问技术可能有很多种，隔离后我们可以随时切换 Account.Repository.EF：仓储服务的EFCore实现，从工程名字应该很容易可以看出来，它实现Account.Repository.Contract。如果这里不想用EF，那我们可以随时新建个工程Account.Repository.Dapper，增加Dapper的实现 Account.Service.Contract：服务层契约，用来隔离Account工程与具体业务服务实现 Account.Service：业务服务，实现Account.Service.Contract这个业务服务层中的契约 Account.VueFE：这个与之前一样，静态前端站点，从项目工程图标上那个互联网球球还有名字中VueFE你就应该能猜出来

In late 1995, the Java programming language burst onto the Internet scene and gained instant celebrity status. The promise of Java technology was that it would become the universal glue that connects users with information wherever it comes from—web servers, databases, information providers, or any other imaginable source. Indeed, Java is in a unique position to fulfill this promise. It is an extremely solidly engineered language that has gained wide acceptance. Its built-in security and safety features are reassuring both to programmers and to the users of Java programs. Java has built-in support for advanced programming tasks, such as network programming, database connectivity, and concurrency.