Java NIO非堵塞技术实际是采取Reactor模式，或者说是Observer模式为我们监察I/O端口，如果有内容进来，会自动通知我们。
package com.java.xiong.file15;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.nio.CharBuffer;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
public class FileChanelTest {
private static FileInputStream fileInputStream;
private static FileOutputStream fileOutputStream;
public static void main(String[] args) {
File files = new File("src/com/java/xiong/file15/FileChanelTest.java");
File filess = new File("1.txt");
try {
fileInputStream = new FileInputStream(files);
FileChannel filein = fileInputStream.getChannel();
fileOutputStream = new FileOutputStream(filess);
FileChannel fileout = fileOutputStream.getChannel();
MappedByteBuffer mapin = filein.map(FileChannel.MapMode.READ_ONLY,
0, files.length());
// 使用GBK来创建解码
Charset cset = Charset.forName("GBK");
fileout.write(mapin);
// 将Buffer 界限和位置复原
mapin.clear();
// 创建解码对象
CharsetDecoder chard = cset.newDecoder();
// byteBuffer转换成charBuffer
CharBuffer charc = chard.decode(mapin);
System.out.println(charc.toString());
} catch (Exception e) {
e.printStackTrace();
}
}
}