stream --> BufferToText

package stream.demo1;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.charset.Charset;

public class BufferToText
{
    private static final int BSIZE = 1024;
    
    public static void main(String[] args)
        throws Exception
    {
        FileChannel fc = new FileOutputStream("data3.txt").getChannel();
        fc.write(ByteBuffer.wrap("Some text".getBytes()));
        fc.close();
        fc = new FileInputStream("data3.txt").getChannel();
        ByteBuffer buff = ByteBuffer.allocate(BSIZE);
        fc.read(buff);
        buff.flip();
        
        System.out.println(buff.asCharBuffer());// 输出数据,乱码
        // 重绕此缓冲区。将位置设置为零并丢弃标记。
        buff.rewind();
        
        // 获取系统编码格式
        String encoding = System.getProperty("file.encoding");
        // Charset.forName(encoding).decode(buff)用Charset去解析缓冲字节流
        System.out.println("Decoded using " + encoding + " : " + Charset.forName(encoding).decode(buff));// 输出数据,无乱码
        
        fc = new FileOutputStream("data3.txt").getChannel();
        fc.write(ByteBuffer.wrap("Some text".getBytes()));
        fc.close();
        fc = new FileInputStream("data3.txt").getChannel();
        buff.clear();
        fc.read(buff);
        buff.flip();
        System.out.println(buff.asCharBuffer()); // 输出数据,乱码
        fc = new FileOutputStream("data3.txt").getChannel();
        buff = ByteBuffer.allocate(24);
        buff.asCharBuffer().put("Some text");
        fc.write(buff);
        fc.close();
        fc = new FileInputStream("data3.txt").getChannel();
        buff.clear();
        fc.read(buff);
        buff.flip();
        System.out.println(buff.asCharBuffer());// 输出数据,乱码
    }
}