字符串标记器-第一个字符串?

我有这个代码来解析URL字符串,比如“?var=Val. 但是当“search”只是“var=val”时,这段代码就失败了,如何使“var=val”也能正常工作呢?

    StringTokenizer st1 =
    new StringTokenizer(search, "?&;");
    while(st1.hasMoreTokens()){
        String st2= st1.nextToken();

        int ii = st2.indexOf("=");
        if (ii > 0) {
            int ib = st2.length();
            myparms.put( st2.substring(0,ii) , st2.substring(ii+1,ib) );
        }
    }