import org.apache.tomcat.util.buf.C2BConverter; //导入依赖的package包/类
private void sendMessage(String message, boolean finalFragment)
        throws IOException {
    ByteChunk bc = new ByteChunk(8192);
    CharChunk cc = new CharChunk(8192);
    C2BConverter c2b = new C2BConverter("UTF-8");
    cc.append(message);
    c2b.convert(cc, bc);

    int len = bc.getLength();
    assertTrue(len < 126);

    byte first;
    if (isContinuation) {
        first = Constants.OPCODE_CONTINUATION;
    } else {
        first = Constants.OPCODE_TEXT;
    }
    if (finalFragment) {
        first = (byte) (0x80 | first);
    }
    os.write(first);

    os.write(0x80 | len);

    // Zero mask
    os.write(0);
    os.write(0);
    os.write(0);
    os.write(0);

    // Payload
    os.write(bc.getBytes(), bc.getStart(), len);

    os.flush();

    // Will the next frame be a continuation frame
    isContinuation = !finalFragment;
}