constant-folding

实现与数据库连接，并返回多值，实现多用户登陆的servlet的一个小案例(Achieved with a small case of the database connection and return value to achieve multi-user login servlet)

说明：  如何搭建springboot，springcloud入门(How to Build Springboot, Introduction to Springcloud)

基于poi的Excel和commons-csv的CSV操作组件，大大减少代码量，提高开发效率(Excel based on POI and CSV operating component based on commons-csv greatly reduce the amount of code and improve development efficiency)

中文分词系统，有IKAnalyzer和MMAnalyzer两种分词方式可供选择，有界面展示，可是清楚的比较两种的特点，各有千秋(Chinese word segmentation system, there are two kinds of segmentation MMAnalyzer IKAnalyzer and methods are available, there are interface shows, but a clear comparison of two characteristics, each has its advantages)

Default File Comparator implements Comparator, Serializable.

The method setPrefix raises a INVALID_CHARACTER_ERR if the specified prefix contains an illegal character.

Handle "hello" messages and feature discovery.

说明：  erp系统，包含生产，销售，以及一系列功能，有BUG(Erp system, including production, sales, and a series of functions, has bugs)

Chat Program b/w Client and Server

这个程序模拟实现了:1网页中生成六个字母的Java小程序，使用到了Random()函数 2:基本类型与String类型的链接 3:常用的数学函数(The code will generate six letters with random(). Another explain the basic types and the String. The last gives us examples of some math functions.)