java后台实现分片上传代码样例

当然，我可以为您提供Java后台实现分片上传代码的样例，以下是一个参考实现：

// 上传文件分片
@RequestMapping(value = "/uploadPart", method = RequestMethod.POST)
@ResponseBody
public Map<String, Object> uploadPart(
        @RequestParam("file") MultipartFile file,
        @RequestParam("uploadId") String uploadId,
        @RequestParam("partNumber") int partNumber) throws Exception {
    
    // 在服务器端保存上传的分片
    savePart(uploadId, partNumber, file.getBytes());
    
    Map<String, Object> result = new HashMap<>();
    result.put("code", "0");
    result.put("msg", "上传成功");
    return result;
}

// 合并所有分片为完整文件
@RequestMapping(value = "/completeUpload", method = RequestMethod.POST)
@ResponseBody
public Map<String, Object> completeUpload(
        @RequestParam("objectName") String objectName,
        @RequestParam("uploadId") String uploadId,
        @RequestParam("partCount") int partCount) throws Exception {
    
    // 获取所有分片并合并为完整文件
    byte[] data = combineParts(uploadId, partCount);
    
    // 保存文件到服务器或者存储服务中
    saveCompleteFile(objectName, data);
    
    Map<String, Object> result = new HashMap<>();
    result.put("code", "0");
    result.put("msg", "上传成功");
    return result;
}

希望能对您有所帮助！