Java OutputStream Skip（offset） [英] Java OutputStream Skip (offset)

问题描述

我正在尝试编写一个函数，该函数接受File对象，偏移量和字节数组参数，并将该字节数组写入Java中的File对象。

I am trying to write a function that takes File object, offset and byte array parameters and writes that byte array to a File object in Java.

所以函数看起来像

public void write(File file, long offset, byte[] data)

但问题是offset参数是long类型，所以我不能使用OutputStream的write（）函数，它接受整数偏移。

But the problem is that the offset parameter is long type, so I can't use write() function of OutputStream, which takes integer as an offset.

与跳过（长）的InputStream不同，似乎OutputStream无法跳过文件的第一个字节。

Unlike InputStream, which has skip(long), it seems OutputStream has no way to skip the first bytes of the file.

有没有解决这个问题的好方法？

Is there a good way to solve this problem?

谢谢。

推荐答案

try {
   FileOutputStream out = new FileOutputStream(file);
   try {
       FileChannel ch = out.getChannel();
       ch.position(offset);
       ch.write(ByteBuffer.wrap(data));
   } finally {
       out.close();
   } 
} catch (IOException ex) {
    // handle error
}

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