Ajax implementa de forma asincrónica la carga de segmentos de archivos

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>JS分片上传-极速上传</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;
				//进行初始化
				$.ajax({  
		                type:"POST", //请求方式 
		                url:"http://localhost:8080/getuploadId",
						async: false,
		                dataType:"json", //返回数据类型
		                data:{//请求参数
		               		fileName:name,
		                },
		                success:function(data){ //请求成功后		                	
		                	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;
							//成功后执行分段上传
							PostFile(file,0,objectName,uploadId);
							//合并
							combineFile(objectName,uploadId);
							
							
						 },
		                error:function (){
		                	alert("系统出现异常！");
		                	flag=false;
		                }    
					}); 
		
        
    });
    //执行分片上传
    function PostFile(file,i,objectName,uploadId){
        var name = file.name,                           //文件名
            size = file.size,                           //总大小shardSize = 2 * 1024 * 1024,
            shardSize = 1 * 1024 * 1024,                //以2MB为一个分片,每个分片的大小
            shardCount = Math.ceil(size / shardSize);   //总片数
        if(i >= shardCount){
            return;
        }
        //console.log(size,i+1,shardSize);  //文件总大小，第一次，分片大小//
        var start = i * shardSize;
        var end = start + shardSize;
        var packet = file.slice(start, end);  //将文件进行切片
		// 分段号
		var partNumber = i + 1;
        /*  构建form表单进行提交  */
        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); //最后的额修改时间
        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); //总片数
        form.append("index", i + 1); //当前是第几片
        $.ajax({
          //  header: {
          //      web_token: "cpBvqWrr0UK9zPJoKj+412alxxcY6qFwrSVoO0juZg0S1jX/sGfMd9oi3AsSxW+MdWFrwtGCykUTmMqrqpbCElmT75DfB87lENC7lCuMxgF0d5wQB6yAubUVyGOzhbrScvIfD8ZSjOJ3D88AOy2xRd4oG8TxeGoMoZqnqIwjKg="
          //  },
            url: "http://localhost:8080/multipartupload",
            type: "POST",
            data: form,
            //timeout:"10000",  //超时10秒
            async: false, //同步
            dataType:"json",
            processData: false, //很重要，告诉jquery不要对form进行处理
            contentType: false, //很重要，指定为false才能形成正确的Content-Type
            success: function (data) {
                console.log("data="+JSON.stringify(data));
                /*  表示上一块文件上传成功，继续下一次  */
                if (data.data.code == 1) {
                    form = '';
                    i++;
                    PostFile(file, i,objectName,uploadId);
                } else if (data.data.code == 502) {
                    form = '';
                    /*  失败后，每2秒继续传一次分片文件  */
                    setInterval(function () { PostFile(file, i,objectName,uploadId) }, 2000);
                } else if (data.data.code == 200) {
                    console.log("上传成功");
                } else if (data.data.code == 500) {
                    console.log('第'+msg.i+'次，上传文件有误！');
                } else {
                    console.log('未知错误');
                }
            }
        })
    }
	//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", //请求方式 
					url:"http://localhost:8080/combine",
					async: false,
					contentType:"application/json",
					dataType:"json", //返回数据类型
					data:JSON.stringify(object),
					success:function(data){ //请求成功后		                	
						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("系统出现异常！");
						flag=false;
					}    
				}); 					
	
	
	}
	
</script>
</html>
Ajax implementa de forma asincrónica la carga de segmentos de archivos

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