currentTimeMillis是java.lang.System的方法：public static long currentTimeMillis()Returns the current time in milliseconds.
See the description of the class Date for a discussion of slight discrepancies that may arise between "computer time" and coordinated universal time (UTC).Returns:
the difference, measured in milliseconds, between the current time and midnight, January 1, 1970 UTC.
See the description of the class Date for a discussion of slight discrepancies that may arise between "computer time" and coordinated universal time (UTC).Returns:
the difference, measured in milliseconds, between the current time and midnight, January 1, 1970 UTC.
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