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http://ajava.org/course/java/10688.html
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http://www.java2s.com/CN/Code/Java/File-Input-Output/useFileChannelandByteBuffer.htm
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http://zcdxzsz.javaeye.com/blog/310917
Java NIO Ó¦Óà -- ʹÓÃÄÚ´æÓ³ÉäÎļþʵÏÖ½ø³Ì¼äͨÐÅ
http://www.blogjava.net/Unmi/archive/2010/03/19/315940.html
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