Java 文件分块上传服务器端源代码

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本博客将介绍如何进行文件的分块上传。如果读者还想了解文件的“分块”下载相关内容可以去参考博客《Java 服务器端支持断点续传的源代码【支持快车、迅雷】》。
        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 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 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 blocks = (List) 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。