transferFrom复制的东西都是空的

 public void TestTransferFrom() {

        try {
            RandomAccessFile raf = new RandomAccessFile("C:\\Users\\Hajon\\Downloads\\apache-maven-3.3.9-bin.zip", "rw");
            FileChannel fromChannel=raf.getChannel();

            RandomAccessFile raf1 = new RandomAccessFile("C:\\Users\\Hajon\\Downloads\\apache-maven-3.3-bin.zip", "rw");
            FileChannel toChannel=raf.getChannel();

            long position=0;
            long size=fromChannel.size();
            System.out.println(size);
            toChannel.transferFrom(fromChannel, position, size);
            raf.close();
            raf1.close();
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }


    }

执行完后的复制结果都是空的怎么回事

public static void TestTransferFrom() {
try {
RandomAccessFile raf = new RandomAccessFile("D:/eclipse/lib/tuscany-sdo-impl-1.1.1.src.zip", "rw");
FileChannel fromChannel=raf.getChannel();

        RandomAccessFile raf1 = new RandomAccessFile("D:/tuscany-sdo-impl-1.1.1.src.zip", "rw");
        FileChannel toChannel=raf1.getChannel();

        long position=0;
        long size=fromChannel.size();
        System.out.println(size);
        toChannel.transferFrom(fromChannel, position, size);
        fromChannel.close();
        toChannel.close();
        raf.close();
        raf1.close();
    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

    输出流应该是raf1，而不是还用输入流。

catch (Exception e)
这里显示什么异常没有

long position=0;
long size=fromChannel.size();
分别是多少，调试下