Java WebSocket

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Base64;
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class WebSocket {
  public static void main(String[] args) throws IOException, NoSuchAlgorithmException {
    ServerSocket server = new ServerSocket(80);
    try {
      System.out.println("Server has started on 127.0.0.1:80.\r\nWaiting for a connection");
      Socket client = server.accept();
      System.out.println("A client connected.");

write(byte[] b, int off, int len)

read(byte[] b, int off, int len)

InputStream in = client.getInputStream();
OutputStream out = client.getOutputStream();
Scanner s = new Scanner(in, "UTF-8");

try {
  String data = s.useDelimiter("\\r\\n\\r\\n").next();
  Matcher get = Pattern.compile("^GET").matcher(data);

if (get.find()) {
  Matcher match = Pattern.compile("Sec-WebSocket-Key: (.*)").matcher(data);
  match.find();
  byte[] response = ("HTTP/1.1 101 Switching Protocols\r\n"
    + "Connection: Upgrade\r\n"
    + "Upgrade: websocket\r\n"
    + "Sec-WebSocket-Accept: "
    + Base64.getEncoder().encodeToString(MessageDigest.getInstance("SHA-1").digest((match.group(1) + "258EAFA5-E914-47DA-95CA-C5AB0DC85B11").getBytes("UTF-8")))
    + "\r\n\r\n").getBytes("UTF-8");
  out.write(response, 0, response.length);

          byte[] decoded = new byte[6];
          byte[] encoded = new byte[] { (byte) 198, (byte) 131, (byte) 130, (byte) 182, (byte) 194, (byte) 135 };
          byte[] key = new byte[] { (byte) 167, (byte) 225, (byte) 225, (byte) 210 };
          for (int i = 0; i < encoded.length; i++) {
            decoded[i] = (byte) (encoded[i] ^ key[i & 0x3]);
          }
        }
      } finally {
        s.close();
      }
    } finally {
      server.close();
    }
  }
}