１．网络IO：
https://mp.weixin.qq.com/s?__biz=MzAwNDA2OTM1Ng==&mid=2453146772&idx=2&sn=689db364f8cbb82bf60c570103f2aa77&scene=21#wechat_redirect
２．Netty
原理：https://mp.weixin.qq.com/s?__biz=MzI5MTU1MzM3MQ==&mid=2247487808&idx=1&sn=043e5e674b798d0f02d13639cba547b6&chksm=ec0fb874db783162d60a288a1b4e4ef008852d773693a77bfc58608fae380fd0a14a40e96195&mpshare=1&scene=1&srcid=0306TEhmGkCjf8gyJS98t8wq&sharer_sharetime=1615043073015&sharer_shareid=ea3069eed3853ee7bfa49973f10ab197&key=e18e9ba4e8360255a25457aa9839e991ee07226116e9d83daf36e9766f035f0d39fda04bf1b63d0a6f9616ac32adbe6ec93cb98043ec2a92634548fe09dc6da8ccdd7d42cdf73a57bd788210dee86b64d1587383d7cff266e9114038de929f33f1286f87944d0776e1806cf3aee7a5e87eea0246f65cb2d5bcd8513d73c52902&ascene=1&uin=MTM2MjU5MjkyMA%3D%3D&devicetype=Windows+XP&version=62060841&lang=en&exportkey=AbFzrR8spDt3l4pxEKq4sKI%3D&pass_ticket=0e9%2FbyxjmOrAoeVqo10cCgvWc09JelAUaEQzNZny3IiPdlNmF2Bto9w9cPQK%2Fyl%2F&wx_header=0
源码：https://mp.weixin.qq.com/s?__biz=MzAwNDA2OTM1Ng==&mid=2453149075&idx=1&sn=97fce87e5784823ad3ac9141292faf09&scene=21#wechat_redirect
面试题：https://mp.weixin.qq.com/s?__biz=MzAwNDA2OTM1Ng==&mid=2453143978&idx=2&sn=556ef80cbb085e8df01dd745ef452e08&scene=21#wechat_redirect
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