将一个String中的特殊字符用转义字符代替的方法

gistfile1.java

 /**
     * @return String with special XML characters escaped.
     */
    public static String escapeXml(String s) {
        StringBuilder sb = new StringBuilder();
        for (int i = 0, len = s.length(); i < len; ++i) {
            char c = s.charAt(i);
            switch (c) {
                case '<':  sb.append("&lt;"); break;
                case '>':  sb.append("&gt;"); break;
                case '"': sb.append("&quot;"); break;
                case ''': sb.append("&#039;"); break;
                case '&':  sb.append("&amp;"); break;
                default: sb.append(c);
            }
        }
        return sb.toString();
    }