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。