spring boot多个图片上传

package com.example.demo.controller;

import org.apache.commons.io.FileUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletRequest;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.IOException;
import java.util.UUID;

@RequestMapping("/api/picture")
@RestController
public class PicUploadController {

    private static final Logger logger = LoggerFactory.getLogger(PicUploadController.class);

    //请求订单列表
    @ResponseBody
    @RequestMapping(value = "/batch/upload", method = RequestMethod.POST)
    public String getOrderDtl(@RequestParam(value = "file") MultipartFile files[], HttpServletRequest request) {
        logger.info("图片批量上传,files[]=",files);
//        String uploadPath = request.getSession().getServletContext().getRealPath("/") + "/upload";
        String uploadPath = "C:\\test\\upload";
        File uploadDirectory = new File(uploadPath);
        if (uploadDirectory.exists()) {
            if (!uploadDirectory.isDirectory()) {
                uploadDirectory.delete();
            }
        } else {
            uploadDirectory.mkdir();
        }
        //这里可以支持多文件上传
        if (files != null && files.length >= 1) {
            BufferedOutputStream bw = null;
            try {
                for (MultipartFile file : files) {
                    String fileName = file.getOriginalFilename();
                    //判断是否有文件且是否为图片文件
                    if(fileName!=null && !"".equalsIgnoreCase(fileName.trim()) && isImageFile(fileName)) {
                        //创建输出文件对象
                        File outFile = new File(uploadPath + "/" + UUID.randomUUID().toString()+ getFileType(fileName));
                        //拷贝文件到输出文件对象
                        FileUtils.copyInputStreamToFile(file.getInputStream(), outFile);
                    }
                }
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                try {
                    if (bw != null) {
                        bw.close();
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }


        return "upload successful";
    }

    private Boolean isImageFile(String fileName) {
        String[] img_type = new String[]{".jpg", ".jpeg", ".png", ".gif", ".bmp"};
        if (fileName == null) {
            return false;
        }
        fileName = fileName.toLowerCase();
        for (String type : img_type) {
            if (fileName.endsWith(type)) {
                return true;
            }
        }
        return false;
    }

    /**
     * 获取文件后缀名
     *
     * @param fileName
     * @return
     */
    private String getFileType(String fileName) {
        if (fileName != null && fileName.indexOf(".") >= 0) {
            return fileName.substring(fileName.lastIndexOf("."), fileName.length());
        }
        return "";
    }


}

环境为springboot2.0.6
spring.servlet.multipart.enabled=true
spring.servlet.multipart.max-file-size=10MB
spring.servlet.multipart.max-request-size=100MB
spring.servlet.multipart.resolve-lazily=false