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http://dalelane.co.uk/blog/?p=2936
jdk1.7 Double.parseDouble() 在多线程情况下变得非常慢，这是 jdk1.7 中的错误并在 jdk1.8 中修复
升级jdk1.7到jdk1.8解决这个问题，因为在jdk1.7中Double.parseDouble()会造成锁竞争