【知了堂学习笔记】_springMVC_文件上传_错误_Required CommonsMultipartFile parameter 'file' is not present

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今天的学习了文件上传出现了：
Required CommonsMultipartFile parameter ‘file’ is not present

开始一直以为是@RequestParm(“file”)参数的传递问题：

public void singleFlieUpload(@RequestParam("file") CommonsMultipartFile commonsMultipartFile, HttpServletRequest request, HttpServletResponse response) {...}

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body><form action="/ssm/upload/singlefileupload.do" method="post" enctype="multipart/form-data"><input type="file" name="file"><input type="submit"></form></body>
</html>

粘贴复制很多遍以后发现，还是不行，百度之后，得到灵感

<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"p:maxUploadSize="5242880"p:maxInMemorySize="4096"p:defaultEncoding="UTF-8"></bean>