如何获得request中的全部参数

private void showParams(HttpServletRequest request) {
        Map map = new HashMap();
        Enumeration paramNames = request.getParameterNames();
        while (paramNames.hasMoreElements()) {
            String paramName = (String) paramNames.nextElement();

            String[] paramValues = request.getParameterValues(paramName);
            if (paramValues.length == 1) {
                String paramValue = paramValues[0];
                if (paramValue.length() != 0) {
                    map.put(paramName, paramValue);
                }
            }
        }

        Set<Map.Entry<String, String>> set = map.entrySet();
        System.out.println("------------------------------");
        for (Map.Entry entry : set) {
            System.out.println(entry.getKey() + ":" + entry.getValue());
        }
        System.out.println("------------------------------");
    }