FileChanel 快速移动文件删除原文件中的数据

import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.channels.FileChannel;


public class MoveFile {
    public static void main(String[] args) {
        transferFileTo("e:\\fromFile.txt", "e:\\toFile.txt");
    }

    private static void transferFileTo(String src, String dest) {
        RandomAccessFile fromFile = null;
        RandomAccessFile toFile = null;
        FileChannel fromChannel = null;
        FileChannel toChannel = null;
        try {
            fromFile = new RandomAccessFile(src, "rw");
            fromChannel = fromFile.getChannel();
            toFile = new RandomAccessFile(dest, "rw");
            toChannel = toFile.getChannel();
            long position = 0;
            long count = fromChannel.size();
            fromChannel.transferTo(position, count, toChannel);
            //从文件0位置阶段，删除后面的数据，相当于删除整个文件中的内容
            fromChannel.truncate(0);
        } catch (java.io.IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (fromChannel != null) {
                    fromChannel.close();
                }
                if (toChannel != null) {
                    toChannel.close();
                }
                if (fromFile != null) {
                    fromFile.close();
                }
                if (toFile != null) {
                    toFile.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}