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import java.nio.*;   
import java.nio.channel.*;   
import java.io.*;   
public static void copy(File source, File dest) throws IOException {   
 FileChannel in = null, out = null;   
 try {    
  in = new FileInputStream(source).getChannel();   
  out = new FileOutputStream(dest).getChannel();   
    
  long size = in.size();   
  MappedByteBuffer buf = in.map(FileChannel.MapMode.READ_ONLY, 0, size);   
    
  out.write(buf);   
  if (in != null) in.close();   
  if (out != null) out.close();   
 }   
}  
import java.nio.*; import java.nio.channel.*; import java.io.*; public static void copy(File source, File dest) throws IOException { FileChannel in = null, out = null; try { in = new FileInputStream(source).getChannel(); out = new FileOutputStream(dest).getChannel(); long size = in.size(); MappedByteBuffer buf = in.map(FileChannel.MapMode.READ_ONLY, 0, size); out.write(buf); if (in != null) in.close(); if (out != null) out.close(); } }
 
̸̸MappedByteBuffer
JDK1.4ÖмÓÈëÁËÒ»¸öеİü:NIO(java.nio.*).Õâ¸ö¿â×î´óµÄ¹¦ÄܾÍÊÇÔö¼ÓÁ˶ÔÒì²½Ì×½Ó×ÖµÄÖ§³Ö.
ÆäʵÔÚÆäËûÓïÑÔÖÐ,°üÀ¨ÔÚ×îԭʼµÄSOCKETʵÏÖ(BSD SOCKET),ÕâÊÇÒ»¸öÔçÓеŦÄÜ:Òì²½»Øµ÷¶Á/дʼþ,
ͨ¹ýÑ¡ÔñÆ÷¶¯Ì¬Ñ¡Ôñ¸ÐÐËȤµÄʼþ,µÈµÈ.²»¹ýºÃÔÚSUNÖÕÓÚÒ²¿ªÊ¼Ö§³ÖËüÁË.
ÎÒÏëÕâÒ²ÊÇ¿ª·ÅµÄºÃ´¦Ö®Ò»°É(NIOÊÇ×÷ΪJSR-51ÏîÄ¿ÒýÈëµÄ).
ÕâÀï¼òµ¥½²Ò»Ï²Ù×÷Á÷³Ì:
ͨ¹ý°ÑÒ»¸öÌ×½Ó×ÖͨµÀ(SocketChannel)×¢²áµ½Ò»¸öÑ¡ÔñÆ÷(Selector)ÖÐ,²»Ê±µ÷ÓúóÕßµÄÑ¡Ôñ(select)·½·¨¾ÍÄÜ·µ»Ø
Âú×ãµÄÑ¡Ôñ¼ü(SelectionKey),¼üÖаüº¬ÁËSOCKETʼþÐÅÏ¢.
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