使用Vue+ElementUI+Axios+SpringBoot实现文件上传

<dependency>
        <groupId>commons-fileupload</groupId>
        <artifactId>commons-fileupload</artifactId>
        <version>1.3.2</version>
</dependency>

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="defaultEncoding" value="UTF-8"/>
        <!--     最大上传大小为1024*1024B，即1MB    -->
        <property name="maxUploadSize" value="1048576"/>
        <!--     延时文件解析   -->
        <property name="resolveLazily" value="true"/>
        <!--     上传的临时路径   -->
        <property name="uploadTempDir" value="file"/>
        <!--     最大在内存中的地址，小于这个参数不会生成临时文件，默认为10240   -->
        <property name="maxInMemorySize" value="40960"/>
    </bean>
</beans>

package com.example.demopro.controller.Upload;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;


@RestController
public class UploadController {
    @RequestMapping("/file/upload")
    public Map<String, Object> upload(MultipartFile file) throws IOException {
        Map<String, Object> map = new HashMap<>();
        if (file != null) {  //如果获取到的文件不为空
            String filename = file.getOriginalFilename();
            String pathname = "/Users/wanna/Desktop/blog/UserLoginDemo/Demo/demopro/src/main/resources/file/";
            File file_server = new File(pathname, filename);  //创建文件对象
            if (!file_server.getParentFile().exists()) {
                //如果文件父目录不存在，就创建这样一个目录
                file_server.getParentFile().mkdirs();
                System.out.println("创建目录" + file);
            } else {  //如果父文件夹已经存在

            }
            file.transferTo(file_server);
            map.put("status", true);
            map.put("msg", "上传文件成功");
        } else {   //如果获取到的文件为空
            map.put("status", false);
            map.put("msg", "上传文件失败");
            map.put("reason", "文件为空");
        }
        return map;
    }

}