jodd-core/src/main/java/jodd/io/FileUtil.java
protected static void outBytes(final File dest, final byte[] data, final int off, final int len, final boolean append) throws IOException {
		if (dest.exists()) {
			checkIsFile(dest);
		}
		FileOutputStream out = null;
		try {
			out = new FileOutputStream(dest, append);
			out.write(data, off, len);
		} finally {
			StreamUtil.close(out);
		}
	}
protected static void outBytes(final File dest, final byte[] data, final int off, final int len, final boolean append) throws IOException {
		if (dest.exists()) {
			checkIsFile(dest);
		}
		FileOutputStream out = null;
		try {
			out = new FileOutputStream(dest, append);
			out.write(data, off, len);
		} finally {
			StreamUtil.close(out);
		}
	}
Writes data to {@link File} destination.

@param dest   destination {@link File}
@param data   Data as a {@link String}
@param off    the start offset in the data.
@param len    the number of bytes to write.
@param append {@code true} if appending; {@code false} if {@link File} should be overwritten.
@throws IOException if something went wrong.