spring boot 大文件上传实现方式（二）

控制器

@ApiOperation(value = "分片上传文件")
@PostMapping("/import/upload/fragment")
@RequiresAuthentication
public Result<UploadResultModel> fragmentUpload(FragmentUploadModel uploadModel, String parentId) throws BusinessException {
    return JsonSuccess(personKnowledgeService.fragmentUpload(uploadModel,parentId));
}


Service实现方法

/**
 * 分片上传文件
 *
 * @param uploadModel
 */
@Override
public UploadResultModel fragmentUpload(FragmentUploadModel uploadModel, String parentId) throws BusinessException {
    String taskId = uploadModel.getTaskId();
    //上传临时文件目录
    String tmpPath = ImportExportConstants.IMPORT_BASE_PATH + taskId + "/" + ImportExportConstants.PART_PATH;
    CommonUtils.createDir(tmpPath);

    String savePath = tmpPath + uploadModel.getChunk();

    try {
        Files.write(Paths.get(savePath), uploadModel.getFile().getBytes());
    } catch (IOException e) {
        e.printStackTrace();
        return null;
    }

    boolean checkResult = checkIsUploadComplete(uploadModel);
    if (checkResult) {
        mergeAndAnalysis(uploadModel);
        addPersonKnowledgeRecord(uploadModel, parentId);
    }
    UploadResultModel resultModel = new UploadResultModel();
    resultModel.setChunks(uploadModel.getChunks());
    resultModel.setOriginalFilename(uploadModel.getFile().getOriginalFilename());
    resultModel.setPart(uploadModel.getPart());
    resultModel.setTaskId(uploadModel.getTaskId());

    return resultModel;
}

/**
 * 检查是否上传完成
 *
 * @param uploadModel
 * @return
 */
private boolean checkIsUploadComplete(FragmentUploadModel uploadModel) {
    String taskId = uploadModel.getTaskId();
    //上传临时文件目录
    String basePath = ImportExportConstants.IMPORT_BASE_PATH + taskId + "/";

    File partDir = new File(basePath + ImportExportConstants.PART_PATH);


    File[] files = partDir.listFiles();
    if (files == null || files.length != uploadModel.getChunks()) {
        return false;
    }
    return true;
}

/**
 * 合并上传文件分片并解析
 *
 * @param uploadModel
 * @return
 */
@Override
public void mergeAndAnalysis(FragmentUploadModel uploadModel) throws BusinessException {
    String taskId = uploadModel.getTaskId();
    //上传临时文件目录
    String basePath = ImportExportConstants.IMPORT_BASE_PATH + taskId + "/";

    //合并分片
    File mergeFile = mergeFiles(basePath, uploadModel);

    File baseDir = new File(basePath);
    File[] files = baseDir.listFiles();

    if (files == null) {
        throw new BusinessException(OpsErrorMessage.MODULE_NAME, OpsErrorMessage.ERROR_MESSAGE, "内容为空！");
    }
}

private File mergeFiles(String basePath, FragmentUploadModel uploadModel) throws BusinessException {
    File partDir = new File(basePath + ImportExportConstants.PART_PATH);
    File destFile = new File(basePath + uploadModel.getName());


    File[] files = partDir.listFiles();
    if (files == null || files.length != uploadModel.getChunks()) {
        throw new BusinessException(OpsErrorMessage.MODULE_NAME, OpsErrorMessage.ERROR_MESSAGE, "文件上传失败！");
    }

    try (FileOutputStream out = new FileOutputStream(destFile, true)) {
        List<File> parts = Lists.newArrayList(files);
        parts.sort(Comparator.comparingInt(o -> Integer.valueOf(o.getName())));

        for (File part : parts) {
            FileUtils.copyFile(part, out);
        }
    } catch (Exception e) {
        throw new BusinessException(OpsErrorMessage.MODULE_NAME, OpsErrorMessage.ERROR_MESSAGE, "文件上传失败！");
    } finally {
        //删除分片文件
        try {
            FileUtils.deleteDirectory(partDir);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    return destFile;
}

private void addPersonKnowledgeRecord(FragmentUploadModel uploadModel, String parentId) {
    String taskId = uploadModel.getTaskId();
    //上传临时文件目录
    String basePath = ImportExportConstants.IMPORT_BASE_PATH + taskId + "/";
    //添加记录
    String fileName = uploadModel.getName();
    PersonKnowledge model = new PersonKnowledge();
    model.setCreateTime(new Date());
    model.setCreateId(SecurityUtils.getSubject().getCurrentUser().getId());
    if (StringUtils.isEmpty(parentId)) {
        parentId = "ROOT";
    }
    model.setParentId(parentId);
    model.setAttchmentType(PersonKnowledgeType.文件.getId());
    String suffixName = fileName.substring(fileName.lastIndexOf("."));
    model.setName(fileName.substring(0, fileName.lastIndexOf("."))); // 新文件名
    model.setAttachmentPath(basePath +  fileName); //文件路径
    model.setSuffix(suffixName.toLowerCase().substring(1));
    //获取文件大小
    Long size = uploadModel.getSize();
    String fileSizeString = "";
    DecimalFormat df = new DecimalFormat("#.00");
    if (size != null) {
        if (size < 1024) {
            fileSizeString = df.format((double) size) + "B";
            model.setFileSize(fileSizeString);
        } else if (size < 1048576) {
            fileSizeString = df.format((double) size / 1024) + "K";
            model.setFileSize(fileSizeString);
        } else if (size < 1073741824) {
            fileSizeString = df.format((double) size / 1048576) + "M";
            model.setFileSize(fileSizeString);
        } else {
            fileSizeString = df.format((double) size / 1073741824) + "G";
            model.setFileSize(fileSizeString);
        }
    }
    personKnowledgeRepository.save(model);
}

参数Model

@ApiModel(description = "分片上传文件模型")
public class FragmentUploadModel {
    /**
     * 分片上传文件
     */
    @ApiModelProperty(value = "分片上传文件")
    private MultipartFile file;
    /**
     * 上传任务id
     */
    @ApiModelProperty(value = "上传任务id")
    private String taskId;
    /**
     * 分片数
     */
    @ApiModelProperty(value = "分片数")
    private Integer chunks;
    /**
     * 分片号
     */
    @ApiModelProperty(value = "分片号")
    private Integer chunk;

    @ApiModelProperty(value = "文件名")
    private String name;
    @ApiModelProperty(value = "文件大小")
    private Long size;

    private String part;

    public Integer getChunk() {
        return chunk;
    }

    public void setChunk(Integer chunk) {
        this.chunk = chunk;
    }

    public MultipartFile getFile() {
        return file;
    }

    public void setFile(MultipartFile file) {
        this.file = file;
    }

    public String getTaskId() {
        return taskId;
    }

    public void setTaskId(String taskId) {
        this.taskId = taskId;
    }

    public Integer getChunks() {
        return chunks;
    }

    public void setChunks(Integer chunks) {
        this.chunks = chunks;
    }

    public String getPart() {
        return part;
    }

    public void setPart(String part) {
        this.part = part;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Long getSize() {
        return size;
    }

    public void setSize(Long size) {
        this.size = size;
    }
}