java 使用 FileChannel 编写任何 InputStream？
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Using FileChannel to write any InputStream?
提问by KiKi
Can I write any InputStream into a FileChannel?
我可以将任何 InputStream 写入 FileChannel 吗？
I'm using java.nio.channels.FileChannel to open a file and lock it, then writing a InputStream to the output file. The InputStream may be opened by another file, URL, socket, or anything. I've write the following codes:
我正在使用 java.nio.channels.FileChannel 打开一个文件并锁定它，然后将 InputStream 写入输出文件。InputStream 可以被另一个文件、URL、套接字或任何东西打开。我写了以下代码：
FileOutputStream outputStream = new FileOutputStream(outputFile);
FileChannel outputChannel = outputStream.getChannel();
FileLock lock = outputChannel.lock();
try {
outputChannel.transferFrom(???);
} finally {
lock.release();
outputChannel.close();
outputStream.close();
}
However, the first argument of outputChannel.transferFrom(...) requests a ReadableByteChannel object. Since I an using a InputStream as input, it do not have inputStream.getChannel() method to create the required channel.
但是， outputChannel.transferFrom(...) 的第一个参数请求 ReadableByteChannel 对象。由于我使用 InputStream 作为输入，它没有 inputStream.getChannel() 方法来创建所需的通道。
Is there any way to get a ReadableByteChannel from a InputStream?
有没有办法从 InputStream 获取 ReadableByteChannel？
回答by Kal
Channels.newChannel(InputStream in)
http://docs.oracle.com/javase/7/docs/api/java/nio/channels/Channels.html
http://docs.oracle.com/javase/7/docs/api/java/nio/channels/Channels.html
回答by Amlan Chatterjee
You can use ReadableByteChannel readableChannel = Channels.newChannel(myinputstream).
您可以使用 ReadableByteChannel readableChannel = Channels.newChannel(myinputstream)。
