NIO的使用（RandomAccessFile、Charset）
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import java.io.FileNotFoundException;import java.io.IOException;import java.io.RandomAccessFile;import java.nio.ByteBuffer;import java.nio.CharBuffer;import java.nio.MappedByteBuffer;import java.nio.channels.FileChannel;import java.nio.charset.Charset;import java.nio.charset.CharsetDecoder;import java.nio.charset.CharsetEncoder;public class test5 {public static void main(String[] args) {RandomAccessFile in = null;RandomAccessFile out = null;try {in = new RandomAccessFile("C:\\Users\\liuyuan\\Desktop\\ant.txt","r");out = new RandomAccessFile("C:\\Users\\liuyuan\\Desktop\\copy.txt","rw");FileChannel fci = in.getChannel();FileChannel fco = out.getChannel();MappedByteBuffer mbb = fci.map(FileChannel.MapMode.READ_ONLY, 0, in.length());Charset latin = Charset.forName("ISO-8859-1");CharsetDecoder decoder = latin.newDecoder();CharsetEncoder encoder = latin.newEncoder();CharBuffer cb = decoder.decode(mbb);ByteBuffer bb = encoder.encode(cb);fco.write(bb);} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();} finally {if (null != in) {try {in.close();} catch (IOException e) {e.printStackTrace();}}if (null != out) {try {out.close();} catch (IOException e) {e.printStackTrace();}}}}}