1、application.xml写相关配置

upload:
  path: d:\\image\\
  domain: http://images.xxx.com
  temp: D:\\temp\\

2、编写接口

import java.io.InputStream;

/**
 * 文件上传
 */
public interface IUploadService {
    /**
     * 上传文件
     *
     * @param inputStream
     * @return
     */
    String upload(InputStream inputStream, String fileName, String uploadType);
}

3、编写实现类

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;

import java.io.*;
import java.util.UUID;

@Service
public class UploadServiceImpl implements IUploadService {

    @Value("${upload.path}")
    private String uploadPath;
    @Value("${upload.domain}")
    private String fileDomain;

    @Override
    public String upload(InputStream inputStream, String fileName, String uploadType) {
        OutputStream os = null;
        try {
            //保证文件夹存在
            isCreateDir(uploadType);
            //重新生成文件名称
            String saveFileName = UUID.randomUUID() + getFileExtension(fileName);
            File file = new File(uploadPath + uploadType + File.separator + saveFileName);
            //循环读取输入流文件内容，通过输出流将内容写入新文件
            os = new FileOutputStream(file);

            byte buffer[] = new byte[1024];
            int cnt = 0;
            while ((cnt = inputStream.read(buffer)) > 0) {
                os.write(buffer, 0, cnt);
            }
            System.out.print(fileDomain + "/" + uploadType + "/" + saveFileName);
            return fileDomain + "/" + uploadType + "/" + saveFileName;
        } catch (FileNotFoundException e) {
            e.printStackTrace();
            throw new SuperKindRunTimeException("文件不存在");
        } catch (IOException e) {
            e.printStackTrace();
            throw new SuperKindRunTimeException("IO异常");
        } finally {
            if (os != null) {
                try {
                    os.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (inputStream != null) {
                try {
                    inputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    /**
     * 获取文件扩展名
     *
     * @param fileName
     * @return
     */
    private String getFileExtension(String fileName) {
        String extension = fileName;
        if (fileName.lastIndexOf(".") != -1) {
            extension = "." + extension.substring(extension.lastIndexOf(".") + 1);
        } else {
            extension = "";
        }
        return extension;
    }


    private void isCreateDir(String uploadType) {
        File file = new File(uploadPath + uploadType);
        //如果文件夹不存在,则新建
        if (!file.exists()) {
            file.mkdirs();
        }
    }
}

4、调用接口就OK

    @Autowired
    private IUploadService uploadService;

        @Override
    public String insertAdjunctByEnquiry(MultipartFile file) {
        try{
            String uploadType = "customer-files";
            String uploadPath = uploadService.upload(file.getInputStream(), file.getOriginalFilename(), uploadType);
            return uploadPath;
        }catch (Exception e){
            e.printStackTrace();
        }
        return null;
    }

5、结果

本地图片