public static String escape(String string) {
        StringBuffer sb = new StringBuffer();
        for (int i = 0, len = string.length(); i < len; i++) {
            char c = string.charAt(i);
            switch (c) {
            case '&':
                sb.append("&amp;");
                break;
            case '<':
                sb.append("&lt;");
                break;
            case '>':
                sb.append("&gt;");
                break;
            case '"':
                sb.append("&quot;");
                break;
            default:
                sb.append(c);
            }
        }
        return sb.toString();
    }