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copied!<p>OK. Seems I find the reason.</p> <p>In HandlerMethodInvoker.java</p> <pre><code>@SuppressWarnings("unchecked") private Object resolveRequestParam(String paramName, boolean required, String defaultValue, MethodParameter methodParam, NativeWebRequest webRequest, Object handlerForInitBinderCall) throws Exception { Class<?> paramType = methodParam.getParameterType(); if (Map.class.isAssignableFrom(paramType)) { return resolveRequestParamMap((Class<? extends Map>) paramType, webRequest); }} private Map resolveRequestParamMap(Class<? extends Map> mapType, NativeWebRequest webRequest) { Map<String, String[]> parameterMap = webRequest.getParameterMap(); if (MultiValueMap.class.isAssignableFrom(mapType)) { MultiValueMap<String, String> result = new LinkedMultiValueMap<String, String>(parameterMap.size()); for (Map.Entry<String, String[]> entry : parameterMap.entrySet()) { for (String value : entry.getValue()) { result.add(entry.getKey(), value); } } return result; } else { Map<String, String> result = new LinkedHashMap<String, String>(parameterMap.size()); for (Map.Entry<String, String[]> entry : parameterMap.entrySet()) { if (entry.getValue().length > 0) { result.put(entry.getKey(), entry.getValue()[0]); } } return result; } } </code></pre> <p>When it checks that if my @RequestParam annotated parameter is Map class type, it puts all request parameters into this parameter as MultiValueMap or Linked HashMap</p>

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