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BIO是最基本的IO，其流程图如下：

示例代码：

public class Server {    public static void main(String[] args) throws Exception {        ServerSocket ss = new ServerSocket();        ss.bind(new InetSocketAddress("127.0.0.1",8888));        while(true) {            System.out.println("开始接收消息");            Socket s = ss.accept();            System.out.println("已经接收到消息");            new Thread(()->{                handler(s);            }).start();        }    }    private static void handler(Socket s) {        try {            byte[] words = new byte[1024];            int read = s.getInputStream().read(words);            System.out.println(read+"-------"+new String(words));            Thread.sleep(2000);            s.getOutputStream().write("总部收到 copy that".getBytes("gbk"));            s.shutdownOutput();            s.shutdownInput();        } catch (Exception e) {            e.printStackTrace();        }    }}public class Client {    public static void main(String[] args) {        Socket s = new Socket();        try {            System.out.println(Thread.currentThread().getName() + "=======" + "client 建立连接");            s.connect(new InetSocketAddress("127.0.0.1", 8888));            System.out.println(Thread.currentThread().getName() + "=======" + "client 发送消息");            s.getOutputStream().write("client hello".getBytes());            s.getOutputStream().flush();            byte[] result = new byte[1024];            s.getInputStream().read(result);            System.out.println(new String(result, "gbk"));            s.getInputStream().close();        } catch (Exception e) {            e.printStackTrace();        } finally {            try {                s.close();                System.out.println("客户端结束");            } catch (IOException e) {                e.printStackTrace();            }        }    }}

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