pom依赖
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.3</version>
</dependency>
在springmvc-servlet.xml中配置文件上传解析器(CommonsMultipartResolver)
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<!-- 必须和用户JSP 的pageEncoding属性一致，以便正确解析表单的内容 -->
<property name="defaultEncoding" value="UTF-8"></property>
<!-- 文件最大大小(字节) 1024*1024*50=50M-->
<property name="maxUploadSize" value="52428800"></property>
<!--resolveLazily属性启用是为了推迟文件解析，以便捕获文件大小异常-->
<property name="resolveLazily" value="true"/>
</bean>
upload.jsp页面
<%--
Created by IntelliJ IDEA.
User: DELL
Date: 2019/10/30
Time: 19:39
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>springmvc文件上传</title>
</head>
<body>
<form action="${pageContext.request.contextPath}/book/upload" method="post" enctype="multipart/form-data">
请选择文件:<input type="file" name="xxx"/>
<input type="submit" value="ok">
</form>
</body>
</html>
在（BoockController）中添加文件上传方法
/**
* 文件上传方法
* @param typeid
* @param bid
* @param req
* @return
*/
@RequestMapping("/upload")
public String upload(HttpServletRequest req, MultipartFile xxx){
String fineName=xxx.getOriginalFilename();
String contentType=xxx.getContentType();
try {
FileUtils.copyInputStreamToFile(xxx.getInputStream(),new File("E:/rj/"+fineName));
}catch (IOException e){
e.printStackTrace();
}
return "redirect:/book/list";
}
