文件包含程序+解说+图示。以SOA的方式，以一种最简单最常用的方式实现加法功能。由于作者特意忽略了SOA的很多配置，所以本例子更适合于初学者参考-File that contains the program, explain the interface. SOA-way to one of the most simplest and most common way to achieve addition function. As the author deliberately ignoring