Java 文件分块上传服务器端源代码

本文侧重介绍服务器端，客户端端请参考本篇博客的姊妹篇《 Java 文件分块上传客户端源代码 》，关于分块上传的思想及其流程，已在该博客中进行了详细说明，这里不再赘述。 
        直接上代码。接收客户端 HTTP 分块上传请求的 Spring MVC 控制器源代码如下：

@Controller
public class UploadController extends BaseController {

  private static final Log log = LogFactory.getLog(UploadController.class);
  private UploadService uploadService;
  private AuthService authService;

  /**
   * 大文件分成小文件块上传,一次传递一块,最后一块上传成功后,将合并所有已经上传的块,保存到File Server
   * 上相应的位置,并返回已经成功上传的文件的详细属性. 当最后一块上传完毕，返回上传成功的信息。此时用getFileList查询该文件，
   * 该文件的uploadStatus为2。client请自行处理该状态下文件如何显示。(for UPS Server)
   * 
   */
  @RequestMapping("/core/v1/file/upload")
  @ResponseBody
  public Object upload(HttpServletResponse response,
      @RequestParam(value = "client_id", required = false) String appkey,
      @RequestParam(value = "sig", required = false) String appsig,
      @RequestParam(value = "token", required = false) String token,
      @RequestParam(value = "uuid", required = false) String uuid,
      @RequestParam(value = "block", required = false) String blockIndex,
      @RequestParam(value = "file", required = false) MultipartFile multipartFile,
      @RequestParam Map<String, String> parameters) {

    checkEmpty(appkey, BaseException.ERROR_CODE_16002);
    checkEmpty(token, BaseException.ERROR_CODE_16007);
    checkEmpty(uuid, BaseException.ERROR_CODE_20016);
    checkEmpty(blockIndex, BaseException.ERROR_CODE_20006);
    checkEmpty(appsig, BaseException.ERROR_CODE_10010);
    if (multipartFile == null) {
      throw new BaseException(BaseException.ERROR_CODE_20020);// 上传文件不存在
    }
    Long uuidL = parseLong(uuid, BaseException.ERROR_CODE_20016);
    Integer blockIndexI = parseInt(blockIndex, BaseException.ERROR_CODE_20006);
    
    Map<String, Object> appMap = getAuthService().validateSigature(parameters);

    AccessToken accessToken = CasUtil.checkAccessToken(token, appMap);
    Long uid = accessToken.getUid();
    String bucketUrl = accessToken.getBucketUrl();
    // 从上传目录拷贝文件到工作目录
    String fileAbsulutePath = null;
    try {
      fileAbsulutePath = this.copyFile(multipartFile.getInputStream(), multipartFile.getOriginalFilename());
    } catch (IOException ioe) {
      log.error(ioe.getMessage(), ioe);
      throw new BaseException(BaseException.ERROR_CODE_20020);// 上传文件不存在
    }
    File uploadedFile = new File(Global.UPLOAD_TEMP_DIR + fileAbsulutePath);
    checkEmptyFile(uploadedFile);// file 非空验证

    Object rs = uploadService.upload(uuidL, blockIndexI, uid, uploadedFile, bucketUrl);
    setHttpStatusOk(response);
    return rs;
  }

  // TODO 查看下这里是否有问题
  // 上传文件非空验证
  private void checkEmptyFile(File file) {
    if (file == null || file.getAbsolutePath() == null) {
      throw new BaseException(BaseException.ERROR_CODE_20020);// 上传文件不存在
    }
  }

  /**
   * 写文件到本地文件夹
   * 
   * @throws IOException
   *             返回生成的文件名
   */
  private String copyFile(InputStream inputStream, String fileName) {
    OutputStream outputStream = null;
    String tempFileName = null;
    int pointPosition = fileName.lastIndexOf(".");
    if (pointPosition < 0) {// myvedio
      tempFileName = UUID.randomUUID().toString();// 94d1d2e0-9aad-4dd8-a0f6-494b0099ff26
    } else {// myvedio.flv
      tempFileName = UUID.randomUUID() + fileName.substring(pointPosition);// 94d1d2e0-9aad-4dd8-a0f6-494b0099ff26.flv
    }
    try {
      outputStream = new FileOutputStream(Global.UPLOAD_TEMP_DIR + tempFileName);
      int readBytes = 0;
      byte[] buffer = new byte[10000];
      while ((readBytes = inputStream.read(buffer, 0, 10000)) != -1) {
        outputStream.write(buffer, 0, readBytes);
      }
      return tempFileName;
    } catch (IOException ioe) {
      // log.error(ioe.getMessage(), ioe);
      throw new BaseException(BaseException.ERROR_CODE_20020);// 上传文件不存在
    } finally {
      if (outputStream != null) {
        try {
          outputStream.close();
        } catch (IOException e) {
        }
      }
      if (inputStream != null) {
        try {
          inputStream.close();
        } catch (IOException e) {
        }
      }

    }

  }

  /**
   * 测试此服务是否可用
   * 
   * @param response
   * @return
   * @author zwq7978
   */
  @RequestMapping("/core/v1/file/testServer")
  @ResponseBody
  public Object testServer(HttpServletResponse response) {
    setHttpStatusOk(response);
    return Global.SUCCESS_RESPONSE;
  }

  public UploadService getUploadService() {
    return uploadService;
  }

  public void setUploadService(UploadService uploadService) {
    this.uploadService = uploadService;
  }

  public void setAuthService(AuthService authService) {
    this.authService = authService;
  }

  public AuthService getAuthService() {
    return authService;
  }

}

        比如要上传的文件是 test450k.mp4。对照《 Java 文件分块上传客户端源代码 》中分块上传服务器对分块文件参数定义的名字"file"，upload 方法里使用的是 MultipartFile 接收该对象。对于每次的 HTTP 请求，使用 copyFile 方法将文件流输出到服务器本地的一个临时文件夹里，比如作者的是 D:/defonds/syncPath/uploadTemp，该文件下会有 50127019-b63b-4a54-8f53-14efd1e58ada.mp4 临时文件生成用于保存上传文件流。 
        分块依次上传。当所有块都上传完毕之后，将这些临时文件都转移到服务器指定目录中，比如作者的这个目录是 D:/defonds/syncPath/file，在该文件夹下会有/1/temp_dir_5_1 目录生成，而 uploadTemp 的临时文件则被挨个转移到这个文件夹下，生成形如 5.part0001 的文件。以下是文件转移的源代码：

/**
   * 把所有块从临时文件目录移到指定本地目录或S2/S3
   * 
   * @param preUpload
   */
  private void moveBlockFiles(BlockPreuploadFileInfo preUpload) {
    @SuppressWarnings("unchecked")
    String[] s3BlockUrl=new String[preUpload.getBlockNumber()];
    String[] localBlockUrl=new String[preUpload.getBlockNumber()];//本地的块文件路径    以便以后删除
    List<BlockUploadInfo> blocks = (List<BlockUploadInfo>) getBaseDao().queryForList(
        "upload.getBlockUploadFileByUuid", preUpload.getUuid());
        
    String tempDirName = SyncUtil.getTempDirName(preUpload.getUuid(), preUpload.getUid());
    String parentPath = Global.UPLOAD_ABSOLUTE_PAHT_ + Global.PATH_SEPARATIVE_SIGN
        + String.valueOf(preUpload.getUid());
    String dirPath = parentPath + Global.PATH_SEPARATIVE_SIGN + tempDirName;
    new File(dirPath).mkdirs();//创建存放块文件的文件夹 （本地）
    int j=0;
    for (BlockUploadInfo info : blocks) {
      try {
        String strBlockIndex = createStrBlockIndex(info.getBlockIndex());
        String suffixPath = preUpload.getUuid() + ".part" + strBlockIndex;
        String tempFilePath = info.getTempFile();
        File tempFile = new File(tempFilePath);
        File tmpFile = new File(dirPath + suffixPath);
        if (tmpFile.exists()) {
          FileUtils.deleteQuietly(tmpFile);
        }
        FileUtils.moveFile(tempFile, tmpFile);
        localBlockUrl[j]=dirPath + suffixPath;
        j++;
        info.setStatus(Global.MOVED_TO_NEWDIR);
        getBaseDao().update("upload.updateBlockUpload", info);
        if (log.isInfoEnabled())
          log.info(preUpload.getUuid() + " " + info.getBuId() + " moveBlockFiles");
      } catch (IOException e) {
        log.error(e.getMessage(), e);
        throw new BaseException("file not found");
      }
    }
    preUpload.setLocalBlockUrl(localBlockUrl);
    preUpload.setDirPath(dirPath);
    preUpload.setStatus(Global.MOVED_TO_NEWDIR);
    getBaseDao().update("upload.updatePreUploadInfo", preUpload);
  }

  private String createStrBlockIndex(int blockIndex) {
    String strBlockIndex;
    if (blockIndex < 10) {
      strBlockIndex = "000" + blockIndex;
    } else if (10 <= blockIndex && blockIndex < 100) {
      strBlockIndex = "00" + blockIndex;
    } else if (100 <= blockIndex && blockIndex < 1000) {
      strBlockIndex = "0" + blockIndex;
    } else {
      strBlockIndex = "" + blockIndex;
    }
    return strBlockIndex;
  }

        最后是文件的组装源代码：

/**
   * 组装文件
   * 
   */
  private void assembleFileWithBlock(BlockPreuploadFileInfo preUpload) {
    String dirPath = preUpload.getDirPath();
    // 开始在指定目录组装文件
    String uploadedUrl = null;
    String[] separatedFiles;
    String[][] separatedFilesAndSize;
    int fileNum = 0;
    File file = new File(dirPath);
    separatedFiles = file.list();
    separatedFilesAndSize = new String[separatedFiles.length][2];
    Arrays.sort(separatedFiles);
    fileNum = separatedFiles.length;
    for (int i = 0; i < fileNum; i++) {
      separatedFilesAndSize[i][0] = separatedFiles[i];
      String fileName = dirPath + separatedFiles[i];
      File tmpFile = new File(fileName);
      long fileSize = tmpFile.length();
      separatedFilesAndSize[i][1] = String.valueOf(fileSize);
    }

    RandomAccessFile fileReader = null;
    RandomAccessFile fileWrite = null;
    long alreadyWrite = 0;
    int len = 0;
    byte[] buf = new byte[1024];
    try {
      uploadedUrl = Global.UPLOAD_ABSOLUTE_PAHT_ + Global.PATH_SEPARATIVE_SIGN + preUpload.getUid() + Global.PATH_SEPARATIVE_SIGN + preUpload.getUuid();
      fileWrite = new RandomAccessFile(uploadedUrl, "rw");
      for (int i = 0; i < fileNum; i++) {
        fileWrite.seek(alreadyWrite);
        // 读取
        fileReader = new RandomAccessFile((dirPath + separatedFilesAndSize[i][0]), "r");
        // 写入
        while ((len = fileReader.read(buf)) != -1) {
          fileWrite.write(buf, 0, len);
        }
        fileReader.close();
        alreadyWrite += Long.parseLong(separatedFilesAndSize[i][1]);
      }
      fileWrite.close();
      preUpload.setStatus(Global.ASSEMBLED);
      preUpload.setServerPath(uploadedUrl);
      getBaseDao().update("upload.updatePreUploadInfo", preUpload);
      
      if(Global.BLOCK_UPLOAD_TO!=Global.BLOCK_UPLOAD_TO_LOCAL)
      {
      //组装完毕没有问题  删除掉S2/S3上的block
      String[] path=preUpload.getS3BlockUrl();
      for (String string : path) {
        try {
          if(Global.BLOCK_UPLOAD_TO==Global.BLOCK_UPLOAD_TO_S2)
          {
          S2Util.deleteFile(preUpload.getBucketUrl(), string);
          }else
          {
          S3Util.deleteFile(preUpload.getBucketUrl(), string);
          }
        } catch (Exception e) {
          log.error(e.getMessage(), e);
        }
      }
      }
      if (log.isInfoEnabled())
        log.info(preUpload.getUuid() + " assembleFileWithBlock");
    } catch (IOException e) {
      log.error(e.getMessage(), e);
      try {
        if (fileReader != null) {
          fileReader.close();
        }
        if (fileWrite != null) {
          fileWrite.close();
        }
      } catch (IOException ex) {
        log.error(e.getMessage(), e);
      }
    }

  }

        BlockPreuploadFileInfo 是我们自定义的业务文件处理 bean。 
        OK，分块上传的服务器、客户端源代码及其工作流程至此已全部介绍完毕，以上源代码全部是经过项目实践过的，大部分现在仍运行于一些项目之中。有兴趣的朋友可以自己动手，将以上代码自行改造，看看能否运行成功。如果遇到问题可以在本博客下跟帖留言，大家一起讨论讨论。