https://blog.csdn.net/guoshaogang/article/details/7231318 https://blog.csdn.net/qq_16628781/article/details/70532307 https://www.cnblogs.com/gaopeng527/p/4896783.html
自己总结： java.io：读取输入流—写入输出流 java.nio:获取通道，通道直连
IO NIO 面向流 面向缓冲 阻塞IO 非阻塞IO 无 选择器 http://ifeve.com/java-nio-vs-io/
https://blog.csdn.net/yangfanend/article/details/55100327?locationNum=3&fps=1
https://www.jianshu.com/p/b9f3f6a16911
HyStrix熔断机制
https://blog.csdn.net/chunlongyu/article/details/53259014
