html5解决大文件断点续传

发布于 2016-08-22  0 次阅读


js代码

!DOCTYPE html>  
<html>  
    <head>  
        <meta charset="UTF-8"/>  
        <title>xhr2</title>  
    </head>  
    <body>  
        <div  id="drop_area" style="border:3px dashed silver;width:200px; height:200px">  
            将图片拖拽到此  
        </div>  
          
        <progress value="0" max="10" id="prouploadfile"></progress>  
          
        <span id="persent">0%</span>  
        <br />  
        <!--<button onclick="xhr2()">ajax上传</button>-->     
        <button onclick="stopup()" id="stop">上传</button>      
        <script>  
        //拖拽上传开始  
        //-1.禁止浏览器打开文件行为  
        document.addEventListener("drop",function(e){  //拖离   
            e.preventDefault();      
        })  
        document.addEventListener("dragleave",function(e){  //拖后放   
            e.preventDefault();      
        })  
        document.addEventListener("dragenter",function(e){  //拖进  
            e.preventDefault();      
        })  
        document.addEventListener("dragover",function(e){  //拖来拖去    
            e.preventDefault();      
        })  
        //上传进度  
        var pro = document.getElementById('prouploadfile');  
        var persent = document.getElementById('persent');  
        function clearpro(){  
            pro.value=0;  
            persent.innerHTML="0%";  
        }  
          
        //2.拖拽  
        var stopbutton = document.getElementById('stop');  
          
        var resultfile=""  
        var box = document.getElementById('drop_area'); //拖拽区域     
        box.addEventListener("drop",function(e){           
            var fileList = e.dataTransfer.files; //获取文件对象    
            console.log(fileList)  
            //检测是否是拖拽文件到页面的操作            
            if(fileList.length == 0){                
                return false;            
            }             
            //拖拉图片到浏览器,可以实现预览功能    
            //规定视频格式  
            //in_array  
            Array.prototype.S=String.fromCharCode(2);  
            Array.prototype.in_array=function(e){  
                var r=new RegExp(this.S+e+this.S);  
                return (r.test(this.S+this.join(this.S)+this.S));  
            };  
            var video_type=["video/mp4","video/ogg"];  
              
            //创建一个url连接,供src属性引用  
            var fileurl = window.URL.createObjectURL(fileList[0]);                
            if(fileList[0].type.indexOf('image') === 0){  //如果是图片  
                var str="<img width='200px' height='200px' src='"+fileurl+"'>";  
                document.getElementById('drop_area').innerHTML=str;                   
            }else if(video_type.in_array(fileList[0].type)){   //如果是规定格式内的视频                    
                var str="<video width='200px' height='200px' controls='controls' src='"+fileurl+"'></video>";  
                document.getElementById('drop_area').innerHTML=str;        
            }else{ //其他格式,输出文件名  
                //alert("不预览");  
                var str="文件名字:"+fileList[0].name;  
                document.getElementById('drop_area').innerHTML=str;      
            }         
            resultfile = fileList[0];     
            console.log(resultfile);      
              
            //切片计算  
            filesize= resultfile.size;  
            setsize=500*1024;  
            filecount = filesize/setsize;  
            //console.log(filecount)  
            //定义进度条  
            pro.max=parseInt(Math.ceil(filecount));   
              
              
              
            i =getCookie(resultfile.name);  
            i = (i!=null && i!="")?parseInt(i):0  
              
            if(Math.floor(filecount)<i){  
                alert("已经完成");  
                pro.value=i+1;  
                persent.innerHTML="100%";  
              
            }else{  
                alert(i);  
                pro.value=i;  
                p=parseInt(i)*100/Math.ceil(filecount)  
                persent.innerHTML=parseInt(p)+"%";  
            }  
              
        },false);    
          
        //3.ajax上传  
  
        var stop=1;  
        function xhr2(){  
            if(stop==1){  
                return false;  
            }  
            if(resultfile==""){  
                alert("请选择文件")  
                return false;  
            }  
            i=getCookie(resultfile.name);  
            console.log(i)  
            i = (i!=null && i!="")?parseInt(i):0  
              
            if(Math.floor(filecount)<parseInt(i)){  
                alert("已经完成");  
                return false;  
            }else{  
                //alert(i)  
            }  
            var xhr = new XMLHttpRequest();//第一步  
            //新建一个FormData对象  
            var formData = new FormData(); //++++++++++  
            //追加文件数据  
              
            //改变进度条  
            pro.value=i+1;  
            p=parseInt(i+1)*100/Math.ceil(filecount)  
            persent.innerHTML=parseInt(p)+"%";  
            //进度条  
              
              
            if((filesize-i*setsize)>setsize){  
                blobfile= resultfile.slice(i*setsize,(i+1)*setsize);  
            }else{  
                blobfile= resultfile.slice(i*setsize,filesize);  
                formData.append('lastone', Math.floor(filecount));  
            }  
                formData.append('file', blobfile);  
                //return false;  
                formData.append('blobname', i); //++++++++++  
            formData.append('filename', resultfile.name); //++++++++++  
                //post方式  
                xhr.open('POST', 'xhr2.php'); //第二步骤  
                //发送请求  
                xhr.send(formData);  //第三步骤  
                stopbutton.innerHTML = "暂停"  
                //ajax返回  
                xhr.onreadystatechange = function(){ //第四步  
                if ( xhr.readyState == 4 && xhr.status == 200 ) {  
                  console.log( xhr.responseText );  
                        if(i<filecount){  
                            xhr2();  
                        }else{  
                            i=0;  
                        }         
                }  
              };  
                //设置超时时间  
                xhr.timeout = 20000;  
                xhr.ontimeout = function(event){  
                alert('请求超时,网络拥堵!低于25K/s');  
              }           
                  
                i=i+1;  
                setCookie(resultfile.name,i,365)  
                  
        }  
          
        //设置cookie  
        function setCookie(c_name,value,expiredays)  
        {  
            var exdate=new Date()  
            exdate.setDate(exdate.getDate()+expiredays)  
            document.cookie=c_name+ "=" +escape(value)+  
            ((expiredays==null) ? "" : ";expires="+exdate.toGMTString()+";path=/")  
        }  
        //获取cookie  
        function getCookie(c_name)  
        {  
        if (document.cookie.length>0)  
          {  
          c_start=document.cookie.indexOf(c_name + "=")  
          if (c_start!=-1)  
            {   
            c_start=c_start + c_name.length+1   
            c_end=document.cookie.indexOf(";",c_start)  
            if (c_end==-1) c_end=document.cookie.length  
            return unescape(document.cookie.substring(c_start,c_end))  
            }   
          }  
        return ""  
        }  
          
          
        function stopup(){  
            if(stop==1){  
                stop = 0  
                  
                xhr2();  
            }else{  
                stop = 1  
                stopbutton.innerHTML = "继续"  
                  
            }  
              
        }  
        </script>  
    </body>  
</html>  


php代码

    <?php  
    //$name=$_POST['username'];  
    $dir=$_POST['filename'];  
    $dir="uploads/".md5($dir);  
    file_exists($dir) or mkdir($dir,0777,true);  
      
      
    $path=$dir."/".$_POST['blobname'];  
      
      
    //print_r($_FILES["file"]);  
    move_uploaded_file($_FILES["file"]["tmp_name"],$path);  
      
    if(isset($_POST['lastone'])){  
        echo $_POST['lastone'];  
        $count=$_POST['lastone'];  
          
        $fp   = fopen($_POST['filename'],"abw");  
        for($i=0;$i<=$count;$i++){  
            $handle = fopen($dir."/".$i,"rb");    
            fwrite($fp,fread($handle,filesize($dir."/".$i)));    
            fclose($handle);      
        }  
        fclose($fp);  
    }  
          
          
    ?>  

只是我心中不再有火花,就让往事随风去吧。