从 fesacr 源码中总结出的 Java 代码编写注意事项

/**
 * Renames the file denoted by this abstract pathname.
 *
 * <p> Many aspects of the behavior of this method are inherently
 * platform-dependent: The rename operation might not be able to move a
 * file from one filesystem to another, it might not be atomic, and it
 * might not succeed if a file with the destination abstract pathname
 * already exists.  The return value should always be checked to make sure
 * that the rename operation was successful.
 *
 * <p> Note that the {@link java.nio.file.Files} class defines the {@link
 * java.nio.file.Files#move move} method to move or rename a file in a
 * platform independent manner.
 */

File file = new File(...);
RandomAccessFile raf = new RandomAccessFile(file, "rw");
// 获取 channel
FileChannel fileChannel = raf.getChannel();
// 写数据
fileChannel.write(...);

fileChannel.close();
raf.close();

public void close() throws IOException {
	synchronized (closeLock) {
		if (closed) {
			return;
		}
		closed = true;
	}
    // 自动关闭 channel
	if (channel != null) {
		channel.close();
	}

	fd.closeAll(new Closeable() {
		public void close() throws IOException {
		   close0();
	   }
	});
}

this.serverBootstrap.group(this.eventLoopGroupBoss, this.eventLoopGroupWorker)
	.channel(NioServerSocketChannel.class)
	.option(ChannelOption.SO_BACKLOG, nettyServerConfig.getSoBackLogSize())
	.option(ChannelOption.SO_REUSEADDR, true)
	// 设置 SO_KEEPALIVE 选项
	.option(ChannelOption.SO_KEEPALIVE, true)