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一图看懂ThreadLocal
2022-07-04 14:43:00 【Hide on jdk】
重要变量：thread , threadlocal ,threadlocalmap ,entries(注意这个是弱引用，遇见gc直接释放)，最后要remove
通过threadlocal来解决
begin->connect->close autocommit->jdbc->commit
强软弱虚：
弱引用：遇见gc回收
key释放value不释放，内存泄漏
锁失效，i是变化的值
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