16 Socket通信（简单例子）

　  服务端代码：

　　

import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Date;

/**
 * socket服务端简单实现，主要作用测试客户端是否可以成功发送数据
 */
public class SocketServer {

    public static void main(String[] args) {
        try {
            ServerSocket serverSocket = new ServerSocket(9999);
            Socket socket=null;
            while(true) {
                 socket = serverSocket.accept();
                 while(socket.isConnected())
                 {
                     // 读取客户端数据
                     InputStream info = socket.getInputStream();
                     DataInputStream dis = new DataInputStream(info);
                     String data="";
                     while((data=dis.readUTF()).length()>0) {
                         //存在数据则输出
                         System.out.println(data);
                         // 向客户端输出数据 说明数据接收成功
                         OutputStream os = socket.getOutputStream();
                         DataOutputStream dos = new DataOutputStream(os);
                         dos.writeUTF("ok!"+new Date());
                         dos.flush();
                     }
                     //400ms输出一次数据
                     try {
                         Thread.sleep(400L);
                     } catch (InterruptedException e) {
                         e.printStackTrace();
                     }
                 }
                //100ms检测一次连接
                try {
                    Thread.sleep(100L);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

　　客户端代码：

import java.io.*;
import java.net.InetAddress;
import java.net.Socket;
import java.net.SocketAddress;
import java.net.UnknownHostException;

/**
 * socket客户端简单实现，主要作用是往本地固定端口发送数据
 */
public class SocketClient {
    public static void main(String[] args) {
        try {
            //建立一个本机socket客户端
            Socket socket = new Socket("127.0.0.1", 9999);
            // 向服务器端发送数据
            OutputStream os =  socket.getOutputStream();
            DataOutputStream bos = new DataOutputStream(os);
            //每隔20ms发送一次数据
            while(true){
                bos.writeUTF("Connect 123 test spark streaming abc xyz hik");
                bos.flush();
                //200ms发送一次数据
                try {
                    Thread.sleep(200L);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                // 接收服务器端数据
                InputStream is = socket.getInputStream();
                DataInputStream dis = new DataInputStream(is);
                System.out.println(dis.readUTF());
            }

        } catch (UnknownHostException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}