ajax異步實現(xiàn)文件分片上傳實例代碼

!DOCTYPE html>
html lang="en">
head>
 meta charset="UTF-8">
 title>JS分片上傳-極速上傳/title>
/head>
body>
 input type="file" name="slice" id="slice" >
 
 div id="output">!-- 信息存放地 --> /div>
br/>
/body>
script src="http://libs.baidu.com/jquery/1.8.3/jquery.min.js">/script>

script type="text/javascript">
 $("#slice").change(function(event) {
  var file = $("#slice")[0].files[0];
		var name = file.name;
				//進(jìn)行初始化
				$.ajax({ 
		    type:"POST", //請求方式 
		    url:"http://localhost:8080/getuploadId",
						async: false,
		    dataType:"json", //返回數(shù)據(jù)類型
		    data:{//請求參數(shù)
		    		fileName:name,
		    },
		    success:function(data){ //請求成功后		    	
		    	console.log("data.code="+JSON.stringify(data));
							console.log("data.data.objectName="+data.data.objectName);
							console.log("data.data.uploadId="+data.data.uploadId);		
							var objectName=data.data.objectName;
							var uploadId=data.data.uploadId;
							//成功后執(zhí)行分段上傳
							PostFile(file,0,objectName,uploadId);
							//合并
							combineFile(objectName,uploadId);
							
							
						 },
		    error:function (){
		    	alert("系統(tǒng)出現(xiàn)異常！");
		    	flag=false;
		    } 
					}); 
		
  
 });
 //執(zhí)行分片上傳
 function PostFile(file,i,objectName,uploadId){
  var name = file.name,       //文件名
   size = file.size,       //總大小shardSize = 2 * 1024 * 1024,
   shardSize = 1 * 1024 * 1024,    //以2MB為一個分片,每個分片的大小
   shardCount = Math.ceil(size / shardSize); //總片數(shù)
  if(i >= shardCount){
   return;
  }
  //console.log(size,i+1,shardSize); //文件總大小，第一次，分片大小//
  var start = i * shardSize;
  var end = start + shardSize;
  var packet = file.slice(start, end); //將文件進(jìn)行切片
		// 分段號
		var partNumber = i + 1;
  /* 構(gòu)建form表單進(jìn)行提交 */
  var form = new FormData();
  form.append("fileId", '001')
  form.append("data", packet); //slice方法用于切出文件的一部分
//   form.append("lastModified", file.lastModified); //最后的額修改時間
  form.append("name", name);
  form.append("totalSize", size);
		
		form.append("uploadId", uploadId);
		form.append("objectName", objectName);
		form.append("mainFile", packet);
		form.append("total", shardCount);
		form.append("sortNumber", partNumber);
		
		//uploadId:uploadId,
		//objectName:objectName,
		//mainFile:blob,
		//total:partCount,
		//sortNumber:partNumber
		
  if(shardCount === i+1){
   shardSize = size - i * shardSize
  }
  form.append("shardSize", shardSize);
  form.append("total", shardCount); //總片數(shù)
  form.append("index", i + 1); //當(dāng)前是第幾片
  $.ajax({
   // header: {
   //  web_token: "cpBvqWrr0UK9zPJoKj+412alxxcY6qFwrSVoO0juZg0S1jX/sGfMd9oi3AsSxW+MdWFrwtGCykUTmMqrqpbCElmT75DfB87lENC7lCuMxgF0d5wQB6yAubUVyGOzhbrScvIfD8ZSjOJ3D88AOy2xRd4oG8TxeGoMoZqnqIwjKg="
   // },
   url: "http://localhost:8080/multipartupload",
   type: "POST",
   data: form,
   //timeout:"10000", //超時10秒
   async: false, //同步
   dataType:"json",
   processData: false, //很重要，告訴jquery不要對form進(jìn)行處理
   contentType: false, //很重要，指定為false才能形成正確的Content-Type
   success: function (data) {
    console.log("data="+JSON.stringify(data));
    /* 表示上一塊文件上傳成功，繼續(xù)下一次 */
    if (data.data.code == 1) {
     form = '';
     i++;
     PostFile(file, i,objectName,uploadId);
    } else if (data.data.code == 502) {
     form = '';
     /* 失敗后，每2秒繼續(xù)傳一次分片文件 */
     setInterval(function () { PostFile(file, i,objectName,uploadId) }, 2000);
    } else if (data.data.code == 200) {
     console.log("上傳成功");
    } else if (data.data.code == 500) {
     console.log('第'+msg.i+'次，上傳文件有誤！');
    } else {
     console.log('未知錯誤');
    }
   }
  })
 }
	//合并
	function combineFile(objectName,uploadId){
			console.log("objectName="+objectName);
			console.log("uploadId="+uploadId);
			var object=new Object();
			object.objectName=objectName;
			object.uploadId=uploadId;
			 $.ajax({ 
				 
     headers: {
						Accept: "application/json; charset=utf-8"
				},
					type:"POST", //請求方式 
					url:"http://localhost:8080/combine",
					async: false,
					contentType:"application/json",
					dataType:"json", //返回數(shù)據(jù)類型
					data:JSON.stringify(object),
					success:function(data){ //請求成功后		    	
						console.log("data="+JSON.stringify(data));
						console.log("data.data.code="+data.data.code);
						console.log("data.data.url="+data.data.url);		
					},
					error:function (){
						alert("系統(tǒng)出現(xiàn)異常！");
						flag=false;
					} 
				}); 					
	
	
	}
	
/script>
/html>