使用Thread来实现PV通信示例，演示PV操作的过程，源码将PV操作的大部分类都写成内部类，写在了一个类文件中，如有需要拆分的朋友请自行拆分。-PV Thread to achieve communication with an example that demonstrates the process of PV operation, the PV source class written in most operations within the class, wrote in a class file, if necessary, split the friends at your own split.