解决：java -jar 在cmd中运行 程序卡顿，卡死的 问题。BIO和NIO案例保存

解决

• 怎么解决，就是 日志别输出到 cmd 就行了。就行了。就行了。

java -jar demo.jar > output.log 2>&1 &

• 最近写东西，遇到了 程序偶尔卡死的情况。是java -jar 启动的。
• 具体卡死为：http请求超级卡顿 或 偶尔反应好多个请求，或 tcp Server 粘包，无法收取消息。
• 直到：我晃了晃 cmd 窗口，最大化，最小化，程序竟然动了，日志又输出了。
• 终于终于明白了，Window cmd 即要保证正常输出，又要保证性能不卡死你的程序
• 那你的程序又输出了很多很多日志，那cmd窗口怎么办呢，只有卡死你的程序了。

怀疑流程

• 因为遇到的是 http请求 和 tcp server 或同时能用，同时不能用，或只能用一个。
• 怀疑1：是 bio tcp server出现了问题，用了 nio 还一样，疯了。
• 怀疑2：spring boot 或 spring框架的问题 或 开线程等等问题，最终各种启动 config配置类，配置bean。在 main方法。使用postConstruct 等等等
• 最后还是没找到问题

    //ApplicationContext context//@PostConstruct//@Async@EventListener(ApplicationReadyEvent.class)/*@Componentpublic class TcpServerListener implements ApplicationListener<WebServerInitializedEvent> {@Autowiredprivate UpdateServer updateServer;@Overridepublic void onApplicationEvent(WebServerInitializedEvent event) {//int serverPort = event.getWebServer().getPort();// 在此处添加代码以创建和启动 TCP 服务器updateServer.startServer(8082);}}*/

BIO

//@Component
public class UpdateServer {/*@SpringBootApplicationpublic class MyApplication {public static void main(String[] args) {SpringApplication.run(MyApplication.class, args);}@EventListener(ApplicationReadyEvent.class)public void startServerSocket() throws IOException {// 创建ServerSocket并绑定端口ServerSocket serverSocket = new ServerSocket(8080);// 启动一个新线程来接受客户端连接new Thread(() -> {while (true) {try {// 接受客户端连接Socket clientSocket = serverSocket.accept();// 处理客户端请求，可以在这里实现自己的逻辑// 关闭客户端连接clientSocket.close();} catch (IOException e) {e.printStackTrace();}}}).start();}}*//*@Componentpublic class TcpServerListener implements ApplicationListener<WebServerInitializedEvent> {@Autowiredprivate UpdateServer updateServer;@Overridepublic void onApplicationEvent(WebServerInitializedEvent event) {//int serverPort = event.getWebServer().getPort();// 在此处添加代码以创建和启动 TCP 服务器updateServer.startServer(8082);}}*//*** TCP升级网关*///@Resource//private TcpUpdateMapper tcpUpdateMapper;/*** Redis*///@Resource//private RedisUtil redisUtil;//new Thread(() -> { }).start();//@PostConstruct//@Async/*public void startServer() throws Exception {//开启TCP ServerServerSocket serverSocket = new ServerSocket(8082);log.info("服务端打开了 Server started on port {}", 8082);while (true) {//等待连接Socket socket = serverSocket.accept();//获取 输入流DataInputStream inputStream = new DataInputStream(socket.getInputStream());DataOutputStream outputStream = new DataOutputStream(socket.getOutputStream());log.info("服务端收到了连接：Accepted connection from client: {}", socket.getInetAddress());//读取的字节数byte[] buffer = new byte[380];//1024//真正读取到了多少个int bytesRead;//循环进行读取while ((bytesRead = inputStream.read(buffer)) != -1) {//处理二进制数据processBinaryData(buffer, bytesRead, socket, outputStream);}//循环读取，正常每次都会读取完毕inputStream.close();outputStream.close();socket.close();}//死循环接收连接}//初始化方法结束*///关闭输入流//socket.shutdownInput();//关闭输出流，关闭 Socket//socket.shutdownOutput();//关闭Socket//socket.close();

NIO

@Configuration
public class TcpServerConfig {/*** TCP升级网关*/@Resourceprivate TcpUpdateMapper tcpUpdateMapper;/*** Redis*/@Resourceprivate StringRedisTemplate stringRedisTemplate;@Value("${tcp.ip}")private String tcpIp;//ApplicationContext context//@PostConstruct//@Async@EventListener(ApplicationReadyEvent.class)public void startServer() {// throws IOException//异步执行//ThreadUtil.execAsync(() -> {try {//打开选择器Selector selector = Selector.open();//打开通道ServerSocketChannel serverSocketChannel = ServerSocketChannel.open();//非阻塞serverSocketChannel.configureBlocking(false);//本机IPserverSocketChannel.bind(new InetSocketAddress(tcpIp, 8082));//进行注册serverSocketChannel.register(selector, SelectionKey.OP_ACCEPT);log.info("===============Server started on port 8082===================");while (true) {//打开通道int readyChannels = selector.select();//校验下if (readyChannels == 0) {continue;}//获取所有的keySet<SelectionKey> selectedKeys = selector.selectedKeys();//取得迭代器Iterator<SelectionKey> keyIterator = selectedKeys.iterator();//如果存在while (keyIterator.hasNext()) {//获取这个keySelectionKey key = keyIterator.next();//如果是个连接if (key.isAcceptable()) {//打开这个通道SocketChannel clientSocketChannel = serverSocketChannel.accept();//非阻塞的clientSocketChannel.configureBlocking(false);//注册为可读clientSocketChannel.register(selector, SelectionKey.OP_READ);log.info("收到连接：Accepted connection from: {}", clientSocketChannel.getRemoteAddress());} else if (key.isReadable()) {//如果是可读，获取通道SocketChannel clientSocketChannel = (SocketChannel) key.channel();//读取数量ByteBuffer buffer = ByteBuffer.allocate(38);//1024//真实读取到了多少个int bytesRead = -1;try {//这里报错了，增加防护，如果防护，这个nio就断了bytesRead = clientSocketChannel.read(buffer);} catch (Exception e) {log.info("未读取到");e.printStackTrace();}//未读取到 关闭if (bytesRead == -1) {clientSocketChannel.close();} else if (bytesRead > 0) {//读取到了buffer.flip();//读到这个字节里byte[] data = new byte[bytesRead];buffer.get(data);//处理逻辑processBinaryData(data, bytesRead, clientSocketChannel);//String message = new String(data).trim();//System.out.println("Received message: " + message);//清理buffer.clear();}//读到了}//是可读的//移除keykeyIterator.remove();}//如果存在}//死循环} catch (Exception e) {e.printStackTrace();}//}, "MyTcpServerThread").start();
}

    //有错误，往外层抛private void sendUpdateMessage(SocketChannel clientSocketChannel) {//去空格redisData = redisData.replace(" ", "");//转为bytebyte[] binaryData = hexStringToBytes(redisData);//申请字节ByteBuffer buffer = ByteBuffer.allocate(binaryData.length);//写入buffer.put(binaryData);buffer.flip();//循环写入while (buffer.hasRemaining()) {try {clientSocketChannel.write(buffer);log.info("发送了一次升级的消息");} catch (IOException e) {log.info("发送升级失败");e.printStackTrace();}}}