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使用 ThreadLocal 一次解决老大难问题
source link: https://juejin.im/post/5e0d8765f265da5d332cde44
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1.ThreadLocal的使用场景 1.1 场景1 每个线程需要一个独享对象（通常是工具类，典型需要使用的类有SimpleDateFormat和Random） 每个Thread内有自己的实例副本，不共享 比喻：教材只有一本，一起做笔记有线程安全问题。复印后没
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