java中InputStream转化为byte[]数组

在commons-io包中org.apache.commons.io.IOUtils类的toByteArray(InputStream input)已经有实现了,我们可以参考下思路,完成我们的方法,我们可以用类似下面的代码实现inputStream转化为byte[]数组

public static byte[] toByteArray(InputStream input) throws IOException {ByteArrayOutputStream output = new ByteArrayOutputStream();byte[] buffer = new byte[4096];int n = 0;while (-1 != (n = input.read(buffer))) {output.write(buffer, 0, n);}return output.toByteArray();
}

下面是IOUtils中摘录出与toByteArray相关的方法：

org.apache.commons.io.IOUtils.toByteArray

方法如下:

public static byte[] toByteArray(InputStream input)throws IOException
{ByteArrayOutputStream output = new ByteArrayOutputStream();copy(input, output);return output.toByteArray();
}public static int copy(InputStream input, OutputStream output)throws IOException
{long count = copyLarge(input, output);if (count > 2147483647L) {return -1;}return (int)count;
}public static long copyLarge(InputStream input, OutputStream output)throws IOException
{byte[] buffer = new byte[4096];long count = 0L;int n = 0;while (-1 != (n = input.read(buffer))) {output.write(buffer, 0, n);count += n;}return count;
}