Is there an easy way to convert a string into a websocket frame format?

Question

So I set up a WebSocket in Java. To send messages, those messages have to be in a Frame format defined here. I found a method some really nice person wrote in java, to convert a string into a frame. But now i'm wondering is there a built-in way to do this? It seems kind of weird, that everybody who wants to use this API needs to implement the method him or herself.

Code (from Haribabu Pasupathy):

public static byte[] convertStringToFrame(String message) {
        byte[] rawData = message.getBytes();

        int frameCount  = 0;
        byte[] frame = new byte[10];

        frame[0] = (byte) 129;

        if(rawData.length <= 125) {
            frame[1] = (byte) rawData.length;
            frameCount = 2;
        }
        else if (rawData.length >= 126 && rawData.length <= 65535) {
            frame[1] = (byte) 126;
            int len = rawData.length;
            frame[2] = (byte)((len >> 8 ) & (byte)255);
            frame[3] = (byte)(len & (byte)255);
            frameCount = 4;
        }
        else {
            frame[1] = (byte) 127;
            int len = rawData.length;
            frame[2] = (byte)((len >> 56 ) & (byte)255);
            frame[3] = (byte)((len >> 48 ) & (byte)255);
            frame[4] = (byte)((len >> 40 ) & (byte)255);
            frame[5] = (byte)((len >> 32 ) & (byte)255);
            frame[6] = (byte)((len >> 24 ) & (byte)255);
            frame[7] = (byte)((len >> 16 ) & (byte)255);
            frame[8] = (byte)((len >> 8 ) & (byte)255);
            frame[9] = (byte)(len & (byte)255);
            frameCount = 10;
        }

        int bLength = frameCount + rawData.length;

        byte[] reply = new byte[bLength];

        int bLim = 0;
        for(int i=0; i<frameCount;i++){
            reply[bLim] = frame[i];
            bLim++;
        }
        for(int i=0; i<rawData.length;i++){
            reply[bLim] = rawData[i];
            bLim++;
        }

        return reply;
    }