java遍历request.getParameterMap，中的值

Map<String, String[]> reqMap = req.getParameterMap();

for (String key : reqMap.keySet()) {
   String[] values = (String[])reqMap.get(key);
   String value = "";
   if (values.length > 0) {
      value = values[0];
   }
   System.out.println("key= "+ key + " and value= " + value);
}