用OIO实现一个简单客户端。具体代码如下：

package com.zhshl.nio; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.io.PrintWriter; import java.net.ServerSocket; import java.net.Socket; import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; /**  * zhshl  2018/10/5  */ public class OIOServer {     public static void main(String[] args) throws IOException {         ServerSocket serverSocket = new ServerSocket(10010);         ExecutorService executorService = Executors.newCachedThreadPool();         System.out.println("服务器启动成功");         while(true){             //获取一个套字节(阻塞)             final Socket socket = serverSocket.accept();             System.out.println("来了一个新的客户端");             executorService.execute(new Runnable() {                 public void run() {                     handler(socket);                 }             });         }     }     /**      * 读取数据      * @param socket      */     public static void handler(Socket socket) {         try {             byte[] bytes = new byte[1024];             InputStream inputStream = socket.getInputStream();             OutputStream outputStream = socket.getOutputStream();             PrintWriter printWriter = new PrintWriter(outputStream);             while(true){                 //读取数据(阻塞)                 int read = inputStream.read(bytes);                 if(read != -1){                     System.out.println(new String(bytes, 0, read,"GBK"));                     printWriter.print("你好："+socket.getInetAddress()+"，" +                             "你刚刚发送的消息我已经接收到了。发送的内容为：" + new String(bytes, 0, read,"GBK"));                     printWriter.flush();                 }else{                     break;                 }             }         } catch (Exception e) {             e.printStackTrace();         }finally{             try {                 System.out.println("socket关闭");                 socket.close();             } catch (IOException e) {                 e.printStackTrace();             }         }     } }