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* NIO | ||
* ClassLoader | ||
* [java修饰词](java修饰词.md) | ||
* [各种坑](各种坑.md) | ||
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### 进阶 | ||
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## 各种坑 | ||
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--- | ||
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#### 1. SimpleDateFormat 不是线程安全的 | ||
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使用过程不要定义为静态全局变量。 | ||
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**正确使用:** | ||
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``` | ||
/** | ||
* 时间是否是今天 | ||
*/ | ||
public static boolean isToday(Long second) { | ||
if (second == null) { | ||
return false; | ||
} | ||
SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd"); | ||
String today = sf.format(System.currentTimeMillis()); | ||
String compare = sf.format(new Date(second * 1000L)); | ||
return StringUtils.equals(today, compare); | ||
} | ||
``` | ||
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#### 2. |
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