Solution to resume uploading of large HTML5 files at breakpoints-PHP Tutorial-php.cn

Solution to resume uploading of large HTML5 files at breakpoints

小云云

Release： 2023-03-22 20:36:01

Original

2232 people have browsed it

This article mainly shares with you the solution for resuming the breakpoint upload of large HTML5 files. It mainly shares with you the code method. I hope it can help you.

js code

!DOCTYPE html>  
<html>  
    <head>  
        <meta charset="UTF-8"/>  
        <title>xhr2</title>  
    </head>  
    <body>  
        <p  id="drop_area" style="border:3px dashed silver;width:200px; height:200px">  
            将图片拖拽到此  
        </p>  
          
        <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(&#39;prouploadfile&#39;);  
        var persent = document.getElementById(&#39;persent&#39;);  
        function clearpro(){  
            pro.value=0;  
            persent.innerHTML="0%";  
        }  
          
        //2.拖拽  
        var stopbutton = document.getElementById(&#39;stop&#39;);  
          
        var resultfile=""  
        var box = document.getElementById(&#39;drop_area&#39;); //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(&#39;image&#39;) === 0){  //如果是图片  
                var str="<img width=&#39;200px&#39; height=&#39;200px&#39; src=&#39;"+fileurl+"&#39;>";  
                document.getElementById(&#39;drop_area&#39;).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=&#39;200px&#39; height=&#39;200px&#39; controls=&#39;controls&#39; src=&#39;"+fileurl+"&#39;></video>";  
                document.getElementById(&#39;drop_area&#39;).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(&#39;drop_area&#39;).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(&#39;lastone&#39;, Math.floor(filecount));  
            }  
                formData.append(&#39;file&#39;, blobfile);  
                //return false;  
                formData.append(&#39;blobname&#39;, i); //++++++++++  
    　　      formData.append(&#39;filename&#39;, resultfile.name); //++++++++++  
                //post方式  
                xhr.open(&#39;POST&#39;, &#39;xhr2.php&#39;); //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(&#39;请求超时，网络拥堵！低于25K/s&#39;);  
            　　}           
                  
                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>

Copy after login

php code

    <?php  
    //$name=$_POST[&#39;username&#39;];  
    $dir=$_POST[&#39;filename&#39;];  
    $dir="uploads/".md5($dir);  
    file_exists($dir) or mkdir($dir,0777,true);  
      
      
    $path=$dir."/".$_POST[&#39;blobname&#39;];  
      
      
    //print_r($_FILES["file"]);  
    move_uploaded_file($_FILES["file"]["tmp_name"],$path);  
      
    if(isset($_POST[&#39;lastone&#39;])){  
        echo $_POST[&#39;lastone&#39;];  
        $count=$_POST[&#39;lastone&#39;];  
          
        $fp   = fopen($_POST[&#39;filename&#39;],"abw");  
        for($i=0;$i<=$count;$i++){  
            $handle = fopen($dir."/".$i,"rb");    
            fwrite($fp,fread($handle,filesize($dir."/".$i)));    
            fclose($handle);      
        }  
        fclose($fp);  
    }  
          
          
    ?>

Copy after login

Related recommendations:

How PHP implements file download breakpoint resume transfer

How to implement breakpoint resume transfer of files in H5

Detailed explanation of how to enable PHP to implement breakpoint resume transfer

The above is the detailed content of Solution to resume uploading of large HTML5 files at breakpoints. For more information, please follow other related articles on the PHP Chinese website!