上传

package com.xpl.controller;

import org.apache.commons.io.FileUtils;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.multipart.MultipartFile;

import java.io.File;
import java.io.IOException;
import java.util.UUID;

@Controller
public class Update {
    @RequestMapping("/update")
    public String update(MultipartFile file) throws IOException {
//        获取上传文件的文件名
        String fileName = file.getOriginalFilename();
//        截取文件后缀
        String suffix = fileName.substring(fileName.lastIndexOf("."));
//        生成新的文件名
        String newName = UUID.randomUUID().toString();
//        保存到固定地址
        FileUtils.copyInputStreamToFile(file.getInputStream(),new File("E:/"+newName+suffix));
        return "index";
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.xpl</groupId>
    <artifactId>downFile</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>war</packaging>
    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>4.3.19.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.kie.modules</groupId>
            <artifactId>org-apache-commons-fileupload</artifactId>
            <version>6.5.0.Final</version>
        </dependency>
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.2</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.5</version>
        </dependency>
    </dependencies>
</project>

<bean class="org.springframework.web.multipart.commons.CommonsMultipartResolver" id="multipartResolver"/>

<form action="/update" enctype="multipart/form-data" method="post">
    选择上传文件：<input type="file" name="file"><br/>
    上传：<input type="submit" value="上传">
</form>

<bean class="org.springframework.web.multipart.commons.CommonsMultipartResolver" id="multipartResolver">
        <property name="maxUploadSize" value="50"/>
    </bean>
    <bean class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver" id="exceptionResolver">
        <property name="exceptionMappings">
            <props>
                <prop key="org.springframework.web.multipart.MaxUploadSizeExceededException">err/MaxSize</prop>
            </props>
        </property>
    </bean>