用户中心主要实现功能为用户的注册和登录，以及简单的修改密码的逻辑。其中使用了 cookie & ThreadLocal 来替代 session 来存储当前用户信息， 使用注解来实现用户访问某个 url 时的登录状态。写该项目的目的其实就是为了将自己以往的学习的东西都实践一下。以后学到的东西也都会整合进来。
项目多模块划分的原则？
配置问题，数据访问层需要数据库连接，业务逻辑层需要缓存连接，放在各自的层中？或者是放在最顶层（比如说 web 层）？如果是更好的办法？每个地 方都有缺点，如果是放在各自的层中那么例如在多个测试环境中分别部署，这是数据库或者缓存服务器都是不同的，难道还要对不同的环境进行分别打包？因 为是直接引用 jar 包的方式，对于引用层来说具体的实现是透明的，难道使用约定配置的方式？好像也不优雅。
划分多模块的意义何在？
just a rookie
React
A declarative, efficient, and flexible JavaScript library for building user interfaces.
🖖 Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.
Typescript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
An Open Source Machine Learning Framework for Everyone
Django
The Web framework for perfectionists with deadlines.
Laravel
A PHP framework for web artisans
Bring data to life with SVG, Canvas and HTML. 📊📈🎉
JavaScript (JS) is a lightweight interpreted programming language with first-class functions.
Some thing interesting about web. New door for the world.
A server is a program made to process requests and deliver data to clients.
Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.
Some thing interesting about visualization, use data art
Some thing interesting about game, make everyone happy.
Facebook
We are working to build community through open source technology. NB: members must have two-factor auth.
Microsoft
Open source projects and samples from Microsoft.
Google
Google ❤️ Open Source for everyone.
Alibaba
Alibaba Open Source for everyone
D3
Data-Driven Documents codes.
Tencent
China tencent open source team.
