指定编码器、解码器，并且利用ByteBuffer读写文件

指定编码器、解码器，并且利用ByteBuffer读写文件。
做个例子，以后编写程序的时候使用。

package cxz.net;

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

public class TryByteBuffer {

	String url = "D:\\workspace\\target";

	public static void main(String[] args) throws IOException {
		// new TryMappedByteBuffer().write();
		new TryMappedByteBuffer().read();
	}

	private void read() throws IOException {
		Charset chrst = Charset.forName("UTF-16");
		File f = new File(url);
		FileChannel readChannel = new FileInputStream(f).getChannel();
		ByteBuffer reader = ByteBuffer.allocate(1024 * 1024);
		readChannel.read(reader);
		reader.flip();//You need call this method befor decode~
		CharBuffer charReader = chrst.decode(reader);
		System.out.println("value=" + charReader.toString());
	}

	private void write() throws IOException {
		Charset chrst = Charset.forName("UTF-16");
		ByteBuffer writer = chrst.encode("Hi ~ This is a test String");
		File f = new File(url);
		// System.out.println(f.exists());
		FileChannel writeChannel = new FileOutputStream(f, false).getChannel();
		writeChannel.write(writer);
		writeChannel.close();

	}
}