java 获取发送的请求中所有参数和值request

Enumeration<?> en = arg0.getParameterNames();
		String str = "cmd=_notify-validate";
		String orderlist="";
		while(en.hasMoreElements()){
			String paramName = (String)en.nextElement();
			String paramValue = arg0.getParameter(paramName);
			orderlist =orderlist+"\r\n"+paramName+"="+paramValue;
			str = str + "&" + paramName + "=" + URLEncoder.encode(paramValue,"ISO-8859-1");
}
System.out.println(str);