WebSocket握手服务端响应算法『java』

/ **
     *  GET / HTTP/1.1
    Upgrade: websocket
    Connection: Upgrade
    Host: localhost:50000
    Sec-WebSocket-Origin: http://localhost
    Sec-WebSocket-Key: BYEBkScKdCuqSKY2Mf6CIg==
    Sec-WebSocket-Version: 8
    Cookie: 
     */
  public HashMap<String, String> getRequestHeader(byte[] data){
    String requestHeader=new String(data);
    requestHeader=requestHeader.substring(0,requestHeader.indexOf("\r\n\r\n"));
        String[] reqarr=requestHeader.split("\r\n");
        reqHeader=new HashMap<String, String>();
        for (int i = 0; i < reqarr.length; i++) {
      String requestHeaderLine=reqarr[i];
          if(requestHeaderLine.toUpperCase().startsWith("GET")||requestHeaderLine.toUpperCase().startsWith("POST")){
        String[] first=requestHeaderLine.split(" ");
        if(first.length==3){
          String method=first[0];
          String location=first[1].replaceAll("\\s","");
          String protocol=first[2].split("/")[0];
          String protocolVersion=first[2].split("/")[1];
          reqHeader.put("Method", method);
          reqHeader.put("Location", location);
          reqHeader.put("Protocol", protocol);
          reqHeader.put("ProtocolVersion", protocolVersion);
        }
      }else{
        String[] reqlinearr=requestHeaderLine.split(":");
        if(reqlinearr.length==2){
          String key=reqlinearr[0];
          String value=reqlinearr[1].replaceAll("\\s","");
          reqHeader.put(key, value.replaceAll("\\s",""));
        }
      }
    }
        return reqHeader;
  }
  public String getResponseHeader(){
    String originKey=reqHeader.get("Sec-WebSocket-Key")+"258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
    java.security.MessageDigest alga = null;
    byte[] digesta = null;
    try {
      alga = java.security.MessageDigest.getInstance("SHA-1");
      alga.update(originKey.getBytes());
        digesta=alga.digest();
    } catch (NoSuchAlgorithmException e) {
      e.printStackTrace();
    }
    byte[] respKey=org.apache.commons.codec.binary.Base64.encodeBase64(digesta);
    String header="HTTP/1.1 101 Switching Protocols\r\n" +
    "Upgrade: Websocket\r\n" +
    "Connection: Upgrade\r\n" +
    "Sec-WebSocket-Accept: "+new String(respKey)+"\r\n\r\n";
    return header;
  }