code: public static SortedMap getParameterMap(HttpServletRequest request) {
          // 参数Map
          Map properties = request.getParameterMap();
          // 返回值Map
          SortedMap returnMap = new TreeMap();
          Iterator entries = properties.entrySet().iterator();
          Map.Entry entry;
          String name = "";
          String value = "";
          while (entries.hasNext()) {
              entry = (Map.Entry) entries.next();
              name = (String) entry.getKey();
              Object valueObj = entry.getValue();
              if (null == valueObj) {
                  value = "";
              } else if (valueObj instanceof String[]) {
                  String[] values = (String[]) valueObj;
                  for (int i = 0; i < values.length; i++) {
                      value = values[i] + ",";
                  }
                  value = value.substring(0, value.length() - 1);
              } else {
                  value = valueObj.toString();
              }
              returnMap.put(name, value.trim());
          }
          return returnMap;
      }
docs: 从request中获得参数Map，并返回可读的Map
  
  @param request
  @return