php大附件上传，支持断点续传

前段时间做视频上传业务，通过网页上传视频到服务器。

视频大小 小则几十M，大则 1G+，以一般的HTTP请求发送数据的方式的话，会遇到的问题：1，文件过大，超出服务端的请求大小限制；2，请求时间过长，请求超时；3，传输中断，必须重新上传导致前功尽弃；

解决方案：

1，修改服务端上传的限制配置；Nginx 以及 PHP 的上传文件限制 不宜过大，一般5M 左右为好；

2，大文件分片，一片一片的传到服务端，再由服务端合并。这么做的好处在于一旦上传失败只是损失一个分片而已，不用整个文件重传，而且每个分片的大小可以控制在4MB以内，服务端限制在4M即可。

前端

Web前端可使用HttpUploader6的大文件上传控件6；官网地址：http://t.cn/EyI6vHh

<div class="section section6 section5">

<div class="part1"><a href="javascript:;" target="_blank" class="part1__btn">批量删除</a><span class="part1__txt"><em class="part1__num" id="upload_num">0</em>个视频，共 <em class="part1__num" id="upload_size">0M</em></span></div>

<table class="section5__table">

<tbody id="thelist">

<tr class="thead">

<th class="col1 allCkeck"><input type="checkbox" name="" class="col1__checkBox"/>视频名称</th><th class="col2">视频大小</th><th class="col3">视频分类</th><th class="col4">状态</th><th class="col5">进度</th><th>操作</th>

</tr>

</tbody>

</table>

<div class="selFile" id="selFile">

<div id="drag_tips">

<div id="btns__add2"></div>

<h2 class="txt1">选择视频文件</h2>

<span class="txt2">或直接将文件拖拽至此窗口</span>

</div>

</div>

<div class="btns"><span class="btns__add" id="btns__add">+添加视频文件</span><span class="btns__upload btns__upload-start" id="uploadBtn"><i class="btns__upload_icon"></i>开始上传视频</span></div>

</div>

//引入插件

<script type="text/javascript" src="media/js/lib/webuploader/js/webuploader.min.js"></script>

upload.js

1 // 文件上传

2 jQuery(function() {

3     var $ = jQuery,

4         $list = $('#thelist'),

5         $btn = $('#upload-start'),

6         $thead = $('.thead'),

7         $part_btn = $('.part1__btn'), //批量上传按钮

8         state = 'pending',

9         fileCount = 0, //上传文件总数

10         fileSize = 0,//上传文件的总大小

11     // 上传按钮

12         $upload = $('#uploadBtn'),

13     // 所有文件的进度信息，key为file id

14         percentages = {},

15     // 所有文件的md5，key为file id

16         md5Obj = {},

17     // 可能有pedding, ready, uploading, confirm, done.

18         state = 'pedding',

19         uploader;

20

21     //浏览器关闭提醒

22     window.is_confirm = false;

23     $(window).bind('beforeunload', function(){

24         // 只有在标识变量is_confirm不为false时，才弹出确认提示

25         if(window.is_confirm !== false)

26             return '正在上传视频，该操作将丢失视频，是否继续？';

27     })

28

29     if ( !WebUploader.Uploader.support() ) {

30         alert( 'Web Uploader 不支持您的浏览器！如果你使用的是IE浏览器，请尝试升级浏览器');

31         throw new Error( 'WebUploader does not support the browser you are using.' );

32     }

33

34     $(".pop2 .btns__sure").click(function(){

35         $('.popup,.pop').hide();

36     });

37

38     uploader = WebUploader.create({

39         //拖拽容器

40         dnd:'#selFile',

41

42         // 不压缩image

43         resize: false,

44

45         // swf文件路径

46         swf: '/media/js/lib/webuploader/js/Uploader.swf',

47

48         // 文件接收服务端。

49         server: '/service/upload/upload_file',

50         //server:'http://vod.test.4399sy.com/service/upload/ssl_upload_file',

51         formData: {

52             file_id: 'file',

53             guid:new Date().getTime() + Math.ceil(Math.random()*100),

54             file_name:''

55         },

56

57         // 选择文件的按钮。可选。

58         // 内部根据当前运行是创建，可能是input元素，也可能是flash.

59         pick: {

60             id:'#btns__add',

61             innerHTML:"+添加视频文件"

62         },

63

64         // 开起分片上传。

65         chunked: true,

66

67         //如果要分片，分多大一片2M

68         chunkSize:2*1024*1024,

69

70         //上传文件的类型

71         accept:{

72             title: 'Videos',

73             extensions: 'mp4,avi,flv',

74             mimeTypes: 'video/*'

75         },

76         //验证文件总数量, 超出则不允许加入队列。

77         fileNumLimit: 10,

78         //单个文件上传的大小限制 2G

79         fileSingleSizeLimit:2*1024*1024*1024,

80

81     });

82

83     //添加文件具体函数

84     function addFile( file ){

85         var data = new Date(),

86             month = (data.getMonth()+1)<10 ? '0'+(data.getMonth()+1) : (data.getMonth()+1),

87             day = data.getDate()<10 ? '0'+ data.getDate(): data.getDate(),

88             time = data.getFullYear() + "-" + month + "-" + day,

89             $tr = $('<tr class="toBeUploaded" id="'+file.id+'"></tr>'),

90             $td = $('<td class="col1"><input type="checkbox" name="" class="col1__checkBox"/><input type="text" value="'+ file.name +'" name="" class="name"/></td><td class="col2">'+convert_size(file.size)+'</td><td class="col3"><select class="class_id">'+ class_options +'</select></td><td class="col4">读取视频中</td><td class="col5">0%</td><td class="col6"><ul><li class="view"><a target="_blank" href="javascript:;">查看</a></li><li class="delete">删除</li></ul></td>').appendTo($tr),

91             $state = $tr.find('td.col4'),

92             $prgress = $tr.find('td.col5'),

93             $delbtn = $tr.find('li.delete');

94

95         $("#selFile").hide();

96

97         if ( file.getStatus() === 'invalid' ) {

98             switch( file.statusText ) {

99                 case 'exceed_size':

100                     text = '文件大小超出';

101                     break;

102

103                 case 'interrupt':

104                     text = '上传暂停';

105                     break;

106

107                 default:

108                     text = '上传失败，请重试';

109                     break;

110             }

111             showError(text);

112         } else {

113             // @todo lazyload

114             percentages[ file.id ] = [ file.size, 0 ];

115             file.rotation = 0;

116         }

117

118         file.on('statuschange', function( cur, prev ) {

119             if ( prev === 'progress' ) {

120                 //上传成功

121             } else if ( prev === 'queued' ) {

122                 // 开始上传

123             }

124

125             // 成功

126             if ( cur === 'error' || cur === 'invalid' ) {

127                 console.log( file.statusText );

128                 showError( file.statusText );

129                 percentages[ file.id ][ 1 ] = 1;

130             } else if ( cur === 'interrupt' ) {

131                 showError( 'interrupt' );

132             } else if ( cur === 'queued' ) {

133                 percentages[ file.id ][ 1 ] = 0;

134             } else if ( cur === 'progress' ) {

135             //   正在上传

136

137             } else if ( cur === 'complete' ) {

138             //   上传完成

139

140             }

141

142             $tr.removeClass( 'state-' + prev ).addClass( 'state-' + cur );

143         });

144         $delbtn.on('click',function(){

145             uploader.removeFile( file );

146         });

147         $tr.appendTo($list);

148         //$tr.insertAfter($thead);

149     }

150

151     // 负责view的销毁

152     function removeFile( file ) {

153         var $tr = $('#'+file.id);

154

155         delete percentages[ file.id ];

156         $tr.off().find('.col6').off().end().remove();

157     }

158

159     function setState( val ) {

160         var file, stats;

161

162         if ( val === state ) {

163             return;

164         }

165

166         $upload.removeClass( 'state-' + state );

167         $upload.addClass( 'state-' + val );

168         state = val;

169

170         switch ( state ) {

171             case 'pedding':

172                 uploader.refresh();

173                 break;

174

175             case 'ready':

176                 uploader.refresh();

177                 break;

178

179             case 'uploading':

180                 $upload.text( '暂停上传' );

181                 break;

182             case 'paused':

183                 $upload.text( '继续上传' );

184                 break;

185

186             case 'confirm':

187                 //$progress.hide();

188                 $upload.text( '开始上传' ).addClass( 'disabled' );

189

190                 stats = uploader.getStats();

191                 if ( stats.successNum && !stats.uploadFailNum ) {

192                     setState( 'finish' );

193                     return;

194                 }

195                 break;

196             case 'finish':

197                 stats = uploader.getStats();

198                 if ( stats.successNum ) {

199                     alert( '上传成功' );

200                 } else {

201                     // 没有成功的图片，重设

202                     state = 'done';

203                     location.reload();

204                 }

205                 break;

206         }

207     }

208

209

210     // 当有文件添加进来的时候

211     uploader.on( 'fileQueued', function( file ) {

212         fileCount++;

213         fileSize += file.size;

214         $("#upload_num").text(fileCount);

215         $("#upload_size").text(convert_size(fileSize));

216         md5Obj[ file.id ] = '';

217         //获取文件MD5 值

218         uploader.md5File( file )

219             // 及时显示进度

220             .progress(function(percentage) {

221                 $( '#'+file.id ).find('.col4').text('读取文件'+parseInt(percentage*100)+"%");

222             })

223             // 完成

224             .then(function(val) {

225             console.log('md5 result:', val);

226             md5Obj[ file.id ] = val;

227             $( '#'+file.id ).find('.col4').text('待上传');

228             setState( 'ready' );

229         });

230         addFile( file );

231     });

232

233     // 删除文件

234     uploader.onFileDequeued = function( file ) {

235         fileCount--;

236         fileSize -= file.size;

237         $("#upload_num").text(fileCount);

238         $("#upload_size").text(convert_size(fileSize));

239         if ( !fileCount ) {

240             setState( 'pedding' );

241         }

242         removeFile( file );

243

244     };

245

246     // 添加“添加文件”的按钮，

247     uploader.addButton({

248         id: '#btns__add2',

249         label: ''

250     });

251

252     // 文件上传过程中创建进度实时显示。

253     uploader.onUploadProgress = function( file, percentage ) {

254         var $tr = $('#'+file.id),

255             $percent = $tr.find('td.col5'),

256             $state = $tr.find('td.col4');

257         percentage = parseInt(percentage*100);

258         if(! (percentage == 0 && percentage == 100)){

259             $state.text("正在上传");

260         }

261         $percent.text( percentage + "%")

262         percentages[ file.id ][ 1 ] = percentage;

263     };

264

265     //上传前，请求服务端 判断文件是否已经上传过

266     uploader.on( 'uploadStart', function( file ) {

267         var type = 'POST';

268         var url = '/service/upload/determine_video_exist';

269         var request_data = {

270             'md5': md5Obj[ file.id ],

271             'type':1

272         };

273         var success = function(r) {

274             uploader.upload( file );

275             console.log(r);

276             if(r.code == 1) {

277                 uploader.skipFile( file );

278                 $( '#'+file.id ).find('.col4').text('视频已存在');

279                 $( '#'+file.id ).find('.col5').text('100%');

280                 $('#'+file.id).find('.view').find('a').attr('href',playmain +'/?video_id='+ r.data.video_id);

281                 $('.pop2 .video_game').text("所在游戏："+r.data.game_name);

282                 $('.pop2 .create_time').text("上传时间："+r.data.create_time);

283                 $('.pop').hide();

284                 $('.pop2').show();

285                 $('.popup').show();

286             }else if(r.code <= 0) {

287                 showError(r.msg);

288             }else {

289

290             }

291         };

292         request(type, url, request_data, success);

293     });

294

295     //当某个文件的分块在发送前触发，主要用来询问是否要添加附带参数，大文件在开起分片上传的前提下此事件可能会触发多次。

296     uploader.on('uploadBeforeSend', function (obj, data, headers) {

297         $tr = $("#"+data.id);

298         var file_name = $tr.find(".name").val();

299         var class_id = $tr.find("select.class_id").val();

300         var reg = /[1-9][0-9]*/g;

301         data.md5 = md5Obj[ obj.file.id ];

302         data.file_name = file_name;

303         data.class_id = class_id;

304         data.guid = data.guid + data.id.replace(/[^0-9]+/g, '');

305     });

306

307     uploader.on( 'uploadSuccess', function( file ,res) {

308         if(res.code == 1){

309             $( '#'+file.id ).find('.col4').text('成功上传');

310             console.log(res);

311             $('#'+file.id).find('.view').find('a').attr('href',playmain +'/?video_id='+ res.data.video_id);

312         }else if(res.code == 2) {

313             $( '#'+file.id ).find('.col4').text('视频已存在');

314             console.log(res);

315             $('#'+file.id).find('.view').find('a').attr('href',playmain +'/?video_id='+ res.data.video_id);

316         }else {

317             showError(res.msg);

318         }

319     });

320

321     uploader.on( 'uploadError', function( file,reason ) {

322         $( '#'+file.id ).find('.col4').text('上传失败');

323         console.log(reason);

324     });

325

326     uploader.on( 'uploadComplete', function( file ) {

327         $( '#'+file.id ).find('.progress').fadeOut();

328     });

329

330     uploader.on( 'all', function( type ) {

331         if ( type === 'startUpload' ) {

332             state = 'uploading';

333         } else if ( type === 'stopUpload' ) {

334             state = 'paused';

335         } else if ( type === 'uploadFinished' ) {

336             state = 'done';

337         }

338

339         if ( state === 'uploading' ) {

340             window.is_confirm = true;

341             $('.toBeUploaded').addClass("uploaded").removeClass("toBeUploaded");

342             $('input.name').attr("disabled","disabled");

343             $('input.col1__checkBox').hide();

344             $('input').attr("disabled","disabled");

345             $('select.class_id').attr("disabled","disabled");

346             $('.btns__add').remove();

347             $upload.addClass("btns__upload-ing").removeClass("btns__upload-start").html('<i class="btns__upload_icon"></i>正在上传视频');

348

349         } else if(state === 'done') {

350             window.is_confirm = false;

351             console.log("上传完成");

352             $upload.addClass("btns__upload-start btns__upload-refresh").removeClass("btns__upload-ing").html('<i class="btns__upload_icon"></i>开始上传视频');

353         }

354     });

355

356     /**

357      * 验证文件格式以及文件大小

358      */

359     uploader.on("error",function (type){

360         var msg = ''

361         switch (type){

362             case "Q_TYPE_DENIED": msg = "请上传mp4格式文件";break;

363             case "F_EXCEED_SIZE": msg = "文件大小不能超过1G";break;

364             case "Q_EXCEED_NUM_LIMIT" : msg = "一次最多能上传10个文件";break;

365             default: msg='';

366         }

367         if(msg != ''){

368             showError(msg);

369         }

370     });

371

372     $part_btn.on('click',function(){

373         $('td .col1__checkBox').each(function(){

374             if($(this).is(':checked')){

375                 var $tr = $(this).parents('tr');

376                 var id = $tr.attr('id');

377                 uploader.removeFile( id );

378             }

379         });

380     });

381     $upload.on('click', function() {

382         var isbreak = false;

383         $(".name").each(function(){

384             if(!$(this).val()|| $(this).val() == ''){

385                 isbreak = true;

386             }

387         })

388         if(isbreak){

389             showError("文件名不能存在为空");

390             return;

391         }

392         $("select.class_id").each(function(){

393             if(!$(this).val()|| $(this).val() == ''){

394                 isbreak = true;

395             }

396         })

397         if(isbreak){

398             showError("分类不能为空，请先添加分类");

399             return;

400         }

401         if ( $(this).hasClass( 'btns__upload-refresh' ) ) {

402             location.reload();

403         }

404         if ( $(this).hasClass( 'btns__upload-ing' ) ) {

405             return false;

406         }

407         var md5Ready = true;

408         $.each(md5Obj,function(index,item){

409             if(!item || item==''){

410                 md5Ready = false;

411             }

412         });

413         if(!md5Ready){

414             showError('文件尚未读取完成，请耐心等待');

415             return false;

416         }

417         if ( state === 'ready' && md5Ready ) {

418             uploader.upload();

419         } else if ( state === 'paused' ) {

420             uploader.upload();

421         } else if ( state === 'uploading' ) {

422             uploader.stop();

423         }

424     });

425     $upload.addClass( 'state-' + state );

426

427 });

后台（PHP）【仅分片上传相关代码】

1     public function action_upload_file(){

2         $file_id = R::string('file_id', 'file');

3         $keepFileName = R::string('keepFileName', 0);

4         $unsize_change = R::numeric('unsize_change',0);

5         $id = R::string('id');   //插件每上传一个视频自带id

6         $guid = R::string('guid');  //标识视频

7         $chunks = R::numeric('chunks');  // 分片数

8         $chunk = R::numeric('chunk');  //分片号

9         $file_name = R::string('file_name');

10         $file = isset($_FILES[$file_id])?$_FILES[$file_id]:'';

11         $md5 = R::string('md5');

12         $this->upload = new Common_Upload();

13

14         if(empty($guid) || empty($file_name) || empty($md5)){

15             $this->response_msg(-1, 'guid 或 file_name 或 md5 不能为空');

16             return;

17         }

18

19         if(empty($file['name'])){

20             $this->response_msg(-1, '请上传一个文件');

21             return;

22         }else{

23             if($chunks){

24                 $res = $this->upload->saveFile_chunks($file,$chunks, $chunk, $guid);

25                 if(empty($res)){

26                     $this->response_msg(-2, '分片上传失败');

27                     return;

28                 }

29

30             }else if($keepFileName){

31                 $res = $this->upload->saveFile_nochunks($file, '', '', $keepFileName);

32             }else{

33                 $res = $this->upload->saveFile_nochunks($file);

34             }

35             if(empty($res)){

36                 $err = $this->upload->getError();

37                 $this->response_msg(-3, '上传文件出错!msg:'.print_r($err, true));

38                 return;

39             }

40             if($unsize_change){

41                 $size = $res['size'];

42             }else{

43                 $size = $this->convert_size($res['size']);

44             }

45

46             //视频上传完成

47             if($chunks && $res['last_chunk']){

48                 $domain = Kohana::$config->load('domain');

49                 $video_domain = $domain[RUN_MOD]['VIDEO'];

50

51                 if(!empty($file_name)){

52                     $res['name'] = $file_name;

53                 }

54                 $video_data = array(

55                     'video_name'=> $file_name,

56                     'video_url'=> $video_domain."/".$res['path'],

57                     'size'=>$res['size'],

58                     'create_time'=> date('y-m-d H:i:s',time()),

59                     'update_time'=> date('y-m-d H:i:s',time()),

60                     'duration'=> $res['time'],

61                     'md5'=>$md5

62                 );

63                 $video_mod = new Model_Videoinfo();

64                 $video = $video_mod->save_video($video_data,$guid);

65                 $res = array(

66                     'path'=>$res['path'],

67                     'chunks'=>$chunks,

68                     'chunk'=>$chunk,

69                     'size'=>$size,

70                     'guid'=> $guid,

71                     'video_id'=>$video[0],

72                     'file'=>$file,

73                     'id'=>$id

74                 );

75                 $this->response_msg(1,'视频上传成功',$res);

76                 return;

77             }

78             //非分片上传

79             if(!$chunks){

80                 $domain = Kohana::$config->load('domain');

81                 $video_domain = $domain[RUN_MOD]['VIDEO'];

82                 if(!empty($file_name)){

83                     $res['name'] = $file_name;

84                 }

85                 $video_data = array(

86                     'video_name'=> $file_name,

87                     'video_url'=> $video_domain."/".$res['path'],

88                     'size'=>$res['size'],

89                     'create_time'=> date('y-m-d H:i:s',time()),

90                     'update_time'=> date('y-m-d H:i:s',time()),

91                     'duration'=> $res['time'],

92                     'md5'=>$md5

93                 );

94                 $video_mod = new Model_Videoinfo();

95                 $video = $video_mod->save_video($video_data,$guid);

96                 if(empty($video)){

97                     $this->response_msg(-6, '视频信息保存失败');

98                     return;

99                 }

100                 $res = array(

101                     'path'=>$res['path'],

102                     'video_data'=>$video_data,

103                     'size'=>$size,

104                     'guid'=> $guid,

105                     'video_id'=>$video[0],

106                     'file'=>$file,

107                     'id'=>$id

108                 );

109                 $this->response_msg(1,'视频上传成功',$res);

110                 return;

111             }

112             //分片上传成功（未全部分片上传完成）

113             $res = array(

114                 'chunks'=>$chunks,

115                 'chunk'=>$chunk,

116             );

117             $this->response_msg(2, '分片上传成功',$res);

118         }

119     }

1     /**

2      * 保存分片文件(注意先验证文件是否合法)

3      *

4      * @param array $file 单个文件

5      * @param string $attachdir 上传文件路径

6      * @param string $upload_type 上传文件类型

7      * @param bool $keepFileName 是否保持文件名,默认不不保持

8      * @return bool

9      */

10     public function saveFile_chunks($file,$chunks, $chunk, $guid)

11     {

12         if(empty($guid) || empty($file) ){

13             return false;

14         }

15         $file_name = (string)$guid . $chunk;

16         //保存分片文件

17         $file_info = $this->saveFile($file, '', '', false, $file_name,true);

18         if ($file_info) {

19             $cache = Cache::instance('memcache');

20             //记录已上传的分片编号，上传顺序并不是按编号顺序进行上传

21             $chunks_list_pre = $cache->get($guid);

22             if(empty($chunks_list_pre)){

23                 $strarr = array();

24                 for($i=0;$i<$chunks;$i++){

25                     $strarr[] = $guid.$i;

26                 }

27                 $cache->set($guid,$strarr,60 * 60 * 24);

28             }

29             $file_path = $cache->set($guid.$chunk,$file_info['path'],60 * 60 * 24);

30

31             $chunk_path_array= array();

32             for($i=0;$i<$chunks;$i++){

33                 if($cache->get($guid.$i)){

34                     $chunk_path_array[$i] = $cache->get($guid.$i);

35                 }

36             }

37             list($Y,$M,$D,$H,$I,$S) = explode('-',date("Y-m-d-H-i-s", time()));

38             $file_info['chunks_path_count'] = count($chunk_path_array);

39             $file_info['last_chunk'] = false;

40             if (count($chunk_path_array) == $chunks) {

41                 //按目录类型存储

42                 $dirType = substr($file_info['type'], 1, strlen($file_info['type']));;

43                 //目录类型前面加上前缀url

44                 $dirType = $this->pre_url.$dirType;

45                 //按年月二级存储

46                 $month_file_path = $Y.'/'.$M;

47                 $saveName ='upload/mp4/'.$month_file_path.'/original/'.$guid.$file_info['type'];

48                 $join_file_name =$this->attachDIR.$saveName;

49                 if(!is_dir($this->attachDIR.'upload/mp4/'.$month_file_path.'/original/')){

50                     mkdir($this->attachDIR.'upload/mp4/'.$month_file_path.'/original/',0755,true);

51                 }

52                 if(! file_exists($join_file_name)){

53                     $fp = fopen($join_file_name, "ab");

54                     //合并过程中对文件加锁，防止同时操作而出错

55                     if (flock($fp,LOCK_EX)){

56                         for ($i = 0; $i < $chunks; $i++) {

57                                 $tmp_file = $this->attachDIR . $chunk_path_array[$i];

58                                 $handle = fopen($tmp_file, "rb");

59                                 fwrite($fp, fread($handle, filesize($tmp_file)));

60                                 fclose($handle);

61                                 unset($handle);

62                                 unlink($tmp_file);//合并完毕的文件就删除

63                         }//组装分片

64                         $cache->delete($guid);

65                         for($i=0;$i<$chunks;$i++){

66                             $cache->delete($guid.$i);

67                         }

68                         $time = $this->getTime($join_file_name,$file_info['type']);

69                         $file_info['time'] = $time;

70                         $file_info['path'] = $saveName;

71                         $file_info['size'] = filesize($join_file_name);

72                         $file_info['last_chunk'] = true;

73

74                         $model_mod = new Model_Base();

75                         $model_mod->disconnect();

76                         $pid = pcntl_fork();

77                         //父进程和子进程都会执行下面代码

78                         if ($pid == -1) {

79                             //错误处理：创建子进程失败时返回-1.

80                             die('could not fork');

81                         } else if ($pid) {

82                             $model_mod->connect();

83                             //对上传完成的视频进行排队转码

84                             $this->thread($join_file_name,$file_info['type'],$guid);

85                             //父进程会得到子进程号，所以这里是父进程执行的逻辑

86                             pcntl_wait($status); //等待子进程中断，防止子进程成为僵尸进程。

87                         } else {

88                             return $file_info;

89                             //子进程得到的$pid为0, 所以这里是子进程执行的逻辑。

90                         }

91

92                     }

93                 }

94

95             }

96             return $file_info;

97         } else {

98                 $this->error[] = '分片上传失败';

99                 return false;

100         }

101             /*}}}*/

102         }

1，实现了分片上传；

2，同时在上传前检查视频md5 是否在库，如已存在可实现“秒传” 功能，即直接复制数据信息，指向同一个文件，不必再上传；

3，可实现断点续传，上传过程中中断；之前上传的分片已保留在服务器，只需重新上传尚未上传的分片即可；

参考文章：http://blog.ncmem.com/wordpress/2019/08/12/java-http%E5%A4%A7%E6%96%87%E4%BB%B6%E6%96%AD%E7%82%B9%E7%BB%AD%E4%BC%A0%E4%B8%8A%E4%BC%A0/