boolean eof = false;
// Parse incoming request
StreamTokenizer st = new StreamTokenizer(br);
do {
    int token = st.nextToken();

    switch (token) {
        case StreamTokenizer.TT_EOF:
            System.out.println("End of File encountered.");
            eof = true;
            break;

        case StreamTokenizer.TT_EOL:
            System.out.println("End of Line encountered.");
            break;

        case StreamTokenizer.TT_WORD:
            System.out.println("Word: " + st.sval);
            break;

        case StreamTokenizer.TT_NUMBER:
            System.out.println("Number: " + st.nval);
            break;

        default:
            System.out.println((char) token + " encountered.");

            if (token == '!') {
                eof = true;
            }
    }
    } while (!eof);