网络编程之一

文件发送：

发送端：

public class Send {
    public static void main(String[] args) throws IOException {
        //发送端
        DatagramSocket send=new DatagramSocket();
        //准备集装箱
        BufferedInputStream bis=new BufferedInputStream(new FileInputStream(new File("d:/Hello/timg.jpg")));
        byte[] bs=new byte[1024];
        int len;

        InetAddress byName = InetAddress.getByName("127.0.0.1");
        while ((len=bis.read(bs))!=-1){
            DatagramPacket dp=new DatagramPacket(bs,len,byName,6666);
            send.send(dp);
        }
    }
}

接收端：

public class Receive {
    public static void main(String[] args) throws IOException {

        DatagramSocket rec = new DatagramSocket(6666);
        byte[] bytes = new byte[1024];
        DatagramPacket dp = new DatagramPacket(bytes, bytes.length);
        BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(new File("d:/Hello/timg1.jpg")));
        int len;
        do {
            rec.receive(dp);
            byte[] data = dp.getData();
            len = dp.getLength();
            bos.write(data, 0, len);
        } while(len >= bytes.length);
        bos.flush();
    }
}

对话：

客户端：

public class ChartClient {
    public static void main(String[] args) throws IOException {
        Socket socket = new Socket("127.0.0.1", 8888);
        System.out.println("连接中.....");
        OutputStream os = socket.getOutputStream();
        Scanner sca = new Scanner(System.in);
        ReadThread th=new ReadThread(socket);
        Thread thread=new Thread(th,"服务器端说");
        thread.start();
        while (true) {
            System.out.println("你想说：");
            String ss = sca.nextLine();
            os.write(ss.getBytes());
            os.flush();
        }
    }
}

服务端：

public class ChartServer {
   static  OutputStream os=null;
    public static void main(String[] args) throws IOException {
        ServerSocket serverSocket=new ServerSocket(8888);
        System.out.println("等待连接中.....");
        Socket server = serverSocket.accept();
        System.out.println("成功连接！");
        OutputStream os = server.getOutputStream();
        ReadThread th=new ReadThread(server);
        Thread thread=new Thread(th,"客户端说");
        thread.start();
        Scanner sca=new Scanner(System.in);
        while(true){
            System.out.println("你想说：");
           String ss=sca.nextLine();
           os.write(ss.getBytes());
           os.flush();
        }
    }

}

创建线程达到不断接受消息的目的：

public class ReadThread implements Runnable {
    private Socket socket;
    private InputStream is;

    public ReadThread(Socket socket) {
        this.socket = socket;
        try {
            is=socket.getInputStream();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void run() {
      while(true){
          byte[] by=new byte[1024];
          int len;
          while(true){
              try {
                  while (((len=is.read(by))!=-1)) {
                      System.out.println(Thread.currentThread().getName()+":"+new String(by,0,len));
                  }
              } catch (IOException e) {
                  e.printStackTrace();
              }

          }
      }
    }
}

来源：CSDN

作者：进击的菜鸟 (..•˘_˘•..)

链接：https://blog.csdn.net/Scar_shy/article/details/103995378