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js+php upload large files in parts

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Apr 18, 2018 pm 03:08 PM

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This article introduces the content of js php fragmented upload of large files, which has certain reference value. Now I share it with everyone. Friends in need can refer to it

1. Understanding part

Why can’t the server directly transfer large files? It is related to several configurations in php.ini

upload_max_filesize = 2M //PHP最大能接受的文件大小
post_max_size = 8M //PHP能收到的最大POST值'
memory_limit = 128M //内存上限
max_execution_time = 30 //最大执行时间

Of course, you cannot simply and rudely increase the above values, otherwise it will be a matter of time before the server memory resources are exhausted.

Solution idea

Fortunately, HTML5 has opened a new FILE API, which can also directly operate binary objects. We can directly implement file cutting on the browser side. According to the previous practice, we have to use Flash The solution will be a lot of trouble to implement.

JS Idea
1. Listen to the onchange event of the upload button
2. Get the FILE object of the file
3. Cut the FILE object of the file and attach it to the FORMDATA object
4. Send the FORMDATA object to the server through AJAX
5. Repeat steps 3 and 4 until the file is sent.

PHP Idea
1. Create the upload folder
2. Move the files from the upload temporary directory to the upload folder
3. After all file blocks are uploaded, perform file synthesis
4.Delete the folder
5.Return to the uploaded file path

##2.html part

<!doctype html>
<html>
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        #progress{
            width: 300px;
            height: 20px;
            background-color:#f7f7f7;
            box-shadow:inset 0 1px 2px rgba(0,0,0,0.1);
            border-radius:4px;
            background-image:linear-gradient(to bottom,#f5f5f5,#f9f9f9);
        }


        #finish{
            background-color: #149bdf;
            background-image:linear-gradient(45deg,rgba(255,255,255,0.15) 25%,transparent 25%,transparent 50%,rgba(255,255,255,0.15) 50%,rgba(255,255,255,0.15) 75%,transparent 75%,transparent);
            background-size:40px 40px;
            height: 100%;
        }
        form{
            margin-top: 50px;
        }
    </style>
</head>
<body>
<p id="progress">
    <p id="finish" style="width: 0%;" progress="0"></p>
</p>
<form action="">
    <input type="file" name="file" id="file">
    <input type="button" value="停止" id="stop">
</form>
<script>
    var fileForm = document.getElementById("file");
    var stopBtn = document.getElementById(&#39;stop&#39;);
    var upload = new Upload();


    fileForm.onchange = function(){
        upload.addFileAndSend(this);
    }


    stopBtn.onclick = function(){
        this.value = "停止中";
        upload.stop();
        this.value = "已停止";
    }


    function Upload(){
        var xhr = new XMLHttpRequest();
        var form_data = new FormData();
        const LENGTH = 1024 * 1024;
        var start = 0;
        var end = start + LENGTH;
        var blob;
        var blob_num = 1;
        var is_stop = 0
        //对外方法，传入文件对象
        this.addFileAndSend = function(that){
 
            var file = that.files[0];
            blob = cutFile(file);
            sendFile(blob,file);
            blob_num  += 1;
        }
        //停止文件上传
        this.stop = function(){
            xhr.abort();
            is_stop = 1;
        }
        //切割文件
        function cutFile(file){
            var file_blob = file.slice(start,end);
            start = end;
            end = start + LENGTH;
            return file_blob;
        };
        //发送文件
        function sendFile(blob,file){
 var total_blob_num = Math.ceil(file.size / LENGTH);
            
            form_data.append(&#39;file&#39;,blob);
            form_data.append(&#39;blob_num&#39;,blob_num);
            form_data.append(&#39;total_blob_num&#39;,total_blob_num);
            form_data.append(&#39;file_name&#39;,file.name);


            xhr.open(&#39;POST&#39;,&#39;http://www.test3.com/fenpian/upload.php&#39;,false);
            xhr.onreadystatechange  = function () {
     if (xhr.readyState==4 && xhr.status==200)
 {
     console.log(xhr.responseText);
     console.log(5555555555);
 }
 
 
     var progress;
                var progressObj = document.getElementById(&#39;finish&#39;);
                if(total_blob_num == 1){
                    progress = &#39;100%&#39;;
                }else{
                    progress = Math.min(100,(blob_num/total_blob_num)* 100 ) +&#39;%&#39;;
 console.log(progress);
 console.log(&#39;分割&#39;);
                }
                progressObj.style.width = progress;
                var t = setTimeout(function(){
                    if(start < file.size && is_stop === 0){
                        blob = cutFile(file);
                        sendFile(blob,file);
                        blob_num  += 1;
                    }else{
                        setTimeout(t);
                    }
                },1000);
            }
            xhr.send(form_data);
        }
    }


</script>
</body>
</html>

3.php part

<?php
class Upload{
    private $filepath = &#39;./upload&#39;; //上传目录
    private $tmpPath;  //PHP文件临时目录
    private $blobNum; //第几个文件块
    private $totalBlobNum; //文件块总数
    private $fileName; //文件名


    public function __construct($tmpPath,$blobNum,$totalBlobNum,$fileName){
        $this->tmpPath =  $tmpPath;
        $this->blobNum =  $blobNum;
        $this->totalBlobNum =  $totalBlobNum;
        $this->fileName =  $fileName;
        
        $this->moveFile();
        $this->fileMerge();
    }
    
    //判断是否是最后一块，如果是则进行文件合成并且删除文件块
    private function fileMerge(){
        if($this->blobNum == $this->totalBlobNum){
            $blob = &#39;&#39;;
            for($i=1; $i<= $this->totalBlobNum; $i++){
                $blob = file_get_contents($this->filepath.&#39;/&#39;. $this->fileName.&#39;__&#39;.$i);
				file_put_contents($this->filepath.&#39;/&#39;. $this->fileName,$blob,FILE_APPEND);
            }
            
           $this->deleteFileBlob();
        }
    }
    
   //删除文件块
    private function deleteFileBlob(){
        for($i=1; $i<= $this->totalBlobNum; $i++){
            @unlink($this->filepath.&#39;/&#39;. $this->fileName.&#39;__&#39;.$i);
        }
    }
    
    //移动文件
    private function moveFile(){
        $this->touchDir();
        $filename = $this->filepath.&#39;/&#39;. $this->fileName.&#39;__&#39;.$this->blobNum;
        move_uploaded_file($this->tmpPath,$filename);
    }
    
    //API返回数据
    public function apiReturn(){
        if($this->blobNum == $this->totalBlobNum){
                if(file_exists($this->filepath.&#39;/&#39;. $this->fileName)){
                    $data[&#39;code&#39;] = 2;
                    $data[&#39;msg&#39;] = &#39;success&#39;;
                    $data[&#39;file_path&#39;] = &#39;http://&#39;.$_SERVER[&#39;HTTP_HOST&#39;].dirname($_SERVER[&#39;DOCUMENT_URI&#39;]).str_replace(&#39;.&#39;,&#39;&#39;,$this->filepath).&#39;/&#39;. $this->fileName;
                }
        }else{
                if(file_exists($this->filepath.&#39;/&#39;. $this->fileName.&#39;__&#39;.$this->blobNum)){
                    $data[&#39;code&#39;] = 1;
                    $data[&#39;msg&#39;] = &#39;waiting for all&#39;;
                    $data[&#39;file_path&#39;] = &#39;&#39;;
                }
        }
        header(&#39;Content-type: application/json&#39;);
        echo json_encode($data);
    }
    
    //建立上传文件夹
    private function touchDir(){
        if(!file_exists($this->filepath)){
            return mkdir($this->filepath);
        }
    }
}


//实例化并获取系统变量传参
$upload = new Upload($_FILES[&#39;file&#39;][&#39;tmp_name&#39;],$_POST[&#39;blob_num&#39;],$_POST[&#39;total_blob_num&#39;],$_POST[&#39;file_name&#39;]);
//调用方法，返回结果
$upload->apiReturn();

3. Problems with php.ini configuration encountered during debugging

3.1

      post_max_size = 10M：

3.2

max_file_uploads:20

3.3

memory_limit：128M;(解释：php页面消耗的最大内存)

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