SpringBoot通过commons-fileupload实现文件上传+上传进度+返回资源url

引入maven资源

<!-- https://mvnrepository.com/artifact/commons-fileupload/commons-fileupload -->
>
	>commons-fileupload>
	>commons-fileupload>
	>1.4>
>

<!-- hutool-all -->
>
	>cn.hutool>
	>hutool-all>
	>5.3.9>
>

SpringBoot配置

修改为自己需要的大小

#文件上传大小配置
spring:
  servlet:
    multipart:
      max-file-size: 1024MB
      max-request-size: 1024MB
#文件上传根目录
file:
  path: /Users/tianpuyang/uploadPath/file/

FileUploadController

uploadFile：文件上传接口

支持多文件上传，url会以逗号分割的形式返回

uploadStatus：上传进度获取接口

通过前端循环调用获取上传进度

deleteFile：文件删除接口

传入uploadFile接口生成的url即可删除

@RestController
public class FileUploadController {

    private final Log log = LogFactory.get();
    /**
     * 配置的上传路径
     */
    @Value("${file.path}")
    private String filePath;

    /**
     * 普通文件上传
     *
     * @param files
     * @param request
     * @return
     */
    @PostMapping("/uploadFile")
    @ApiOperation("普通文件上传")
    public JsonResult uploadFile(@RequestParam("files") List<CommonsMultipartFile> files, HttpServletRequest request) {
        StringBuffer buffer = new StringBuffer();
        for (CommonsMultipartFile file : files) {
            //获取原文件名称和后缀
            String originalFilename = file.getOriginalFilename();
            // 获取文件后缀名
            String fil_extension = originalFilename.substring(originalFilename.lastIndexOf(".") + 1);

            LocalDateTime now = LocalDateTimeUtil.now();
            int year = now.getYear();
            int month = now.getMonthValue();
            int day = now.getDayOfMonth();
            long milli = now.toInstant(ZoneOffset.of("+8")).toEpochMilli();
            String path = StrUtil.format("{}/{}/{}/{}", year, month, day, milli + originalFilename);
            try {
                File file1 = new File(filePath + path);
                boolean mkdirs = file1.mkdirs();
                log.info("文件夹{}创建{}", file1.getAbsolutePath(), mkdirs ? "成功" : "失败");
                file.transferTo(file1);
                log.info("{} 上传成功！", originalFilename);
                if (StrUtil.isBlank(buffer)) {
                    path = StrUtil.format("{}://{}:{}/{}/{}", request.getScheme(), StrUtil.equals(SystemUtil.getHostInfo().getAddress(), "127.0.0.1") ? "192.168.31.120" : SystemUtil.getHostInfo().getAddress(), request.getServerPort(), "upload", path);
                } else {
                    path = StrUtil.format(",{}://{}:{}/{}/{}", request.getScheme(), StrUtil.equals(SystemUtil.getHostInfo().getAddress(), "127.0.0.1") ? "192.168.31.120" : SystemUtil.getHostInfo().getAddress(), request.getServerPort(), "upload", path);
                }
                buffer.append(path);
            } catch (IOException e) {
                e.printStackTrace();
                log.error("{} 上传失败！", originalFilename);
                continue;
            }

        }
        return new JsonResult(buffer);
    }

    /**
     * 获取上传进度
     *
     * @param request
     * @return
     */
    @GetMapping(value = "/uploadStatus")
    @ApiOperation("获取上传进度")
    public JsonResult uploadStatus(HttpServletRequest request) {
        HttpSession session = request.getSession();
        ProgressEntity percent = (ProgressEntity) session.getAttribute("status");
        return new JsonResult(percent);
    }

    /**
     * 删除文件
     *
     * @param url http://127.0.0.1:8080/upload/2020/7/19/1595158527436video.mp4
     * @return
     */
    @GetMapping(value = "/deleteFile")
    @ApiOperation("删除文件")
    public JsonResult deleteFile(String url) {
        //截取第四个“/”后面的字符串
        int i1 = url.indexOf('/');
        int i2 = url.indexOf('/', i1 + 1);
        int i3 = url.indexOf('/', i2 + 1);
        int i4 = url.indexOf("/", i3 + 1);
        String substring = url.substring(i4 + 1, url.length());
        String relPath = filePath + substring;
        File file = new File(relPath);
        if (file.isFile() && file.exists()) {
            boolean delete = file.delete();
            if (!delete) {
                log.error("{} 删除失败！", substring);
                throw new MyException(ErrorEnum.FILE_DELETE_EXCEPTION);
            } else {
                log.info("{} 删除成功！", substring);
            }
        } else {
            log.error("{} 文件不存在！", substring);
            throw new MyException(ErrorEnum.FILE_NOT_EXISTS);
        }
        return new JsonResult("删除成功");
    }
}

ProgressEntity

@Component
@Data
@ToString
public class ProgressEntity {
    // 读取的文件的比特数
    private long pBytesRead = 0L;
    // 文件的总大小
    private long pContentLength = 0L;
    // 目前正在读取第几个文件
    private int pItems;

    private long startTime = System.currentTimeMillis();
}

CustomMultipartResolver

public class CustomMultipartResolver extends CommonsMultipartResolver {

    @Autowired
    private FileUploadProgressListener listener;

    @Override
    protected MultipartParsingResult parseRequest(HttpServletRequest request) throws MultipartException {
        String encoding = determineEncoding(request);
        FileUpload fileUpload = prepareFileUpload(encoding);
        // 文件上传进度监听器设置session用于存储上传进度
        listener.setHttpSession(request.getSession());
        // 将文件上传进度监听器加入到 fileUpload 中
        fileUpload.setProgressListener(listener);
        try {
            List<FileItem> fileItems = ((ServletFileUpload) fileUpload).parseRequest(request);
            return parseFileItems(fileItems, encoding);
        } catch (FileUploadBase.SizeLimitExceededException ex) {
            throw new MaxUploadSizeExceededException(fileUpload.getSizeMax(), ex);
        } catch (FileUploadBase.FileSizeLimitExceededException ex) {
            throw new MaxUploadSizeExceededException(fileUpload.getFileSizeMax(), ex);
        } catch (FileUploadException ex) {
            throw new MultipartException("Failed to parse multipart servlet request", ex);
        }
    }

FileUploadProgressListener

获取上传进度的解决方法是将进度放进session中

/**
 * 文件上传进度
 */
@Component
public class FileUploadProgressListener implements ProgressListener {

    private HttpSession httpSession;

    public void setHttpSession(HttpSession httpSession) {
        this.httpSession = httpSession;
        ProgressEntity status = new ProgressEntity();
        //默认进度为0
        httpSession.setAttribute("status", status);
    }

    /**
     * pBytesRead  到目前为止读取文件的比特数
     * pContentLength 文件总大小
     * pItems 目前正在读取第几个文件
     */
    @Override
    public void update(long pBytesRead, long pContentLength, int pItems) {
        ProgressEntity status = (ProgressEntity) httpSession.getAttribute("status");
        status.setPBytesRead(pBytesRead);
        status.setPContentLength(pContentLength);
        status.setPItems(pItems);
//        System.out.println("UploadProgressListener update ProgressEntity:  " + status.toString());
    }
}

FileConfig

用来实现通过解析url访问资源

@Configuration
@EnableAutoConfiguration
public class FileConfig implements WebMvcConfigurer {
    /**
     * 指定自定义解析器
     * 将 multipartResolver 指向我们刚刚创建好的继承 CustomMultipartResolver 类的 自定义文件上传处理类
     *
     * @return
     */
    @Bean(name = "multipartResolver")
    public MultipartResolver multipartResolver() {
        return new CustomMultipartResolver();
    }


    /**
     * 图片保存路径，自动从yml文件中获取数据
     *   示例： D:/upload/
     */
    @Value("${file.path}")
    private String fileSavePath;

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        /**
         * 配置资源映射
         * 意思是：如果访问的资源路径是以“/images/”开头的，
         * 就给我映射到本机的“E:/images/”这个文件夹内，去找你要的资源
         * 注意：E:/images/ 后面的 “/”一定要带上
         */
        registry.addResourceHandler("/upload/**")
                .addResourceLocations("file:"+fileSavePath);
    }
}