打印HttpServletRequest

/**     *      * getRequestURL:(将HttpServletRequest转成URL参数字符串 ). <br/>     *     */    public static String getRequestURL(HttpServletRequest request) {                StringBuilder sb = new StringBuilder();        boolean isFirst = true;        @SuppressWarnings("unchecked")        Enumeration<String> er = request.getParameterNames();        while (er.hasMoreElements()) {            String name = (String) er.nextElement();            String value = request.getParameter(name);            if (isFirst) {                sb.append(name + "=" + value);                isFirst = false;            }            else {                if (value != null) {                    sb.append("&" + name + "=" + value);                }                else {                    sb.append("&" + name + "=");                }            }        }        return sb.toString();    }