How to implement refresh-free upload in php and html5-PHP Tutorial-php.cn

This article mainly shares with you the method of achieving refresh-free upload in php and html5. It mainly shares with you the method of pictures and texts. I hope it can help you.

##Adapted from the Internet----->>>>>>>>>

Clear your thoughts:

Introduces two concepts: block and chunk. Each block is composed of one or more slices, and a resource is composed of one or more blocks

The block is the permanent data storage unit of the server, and the slice is only in It is used as a temporary storage unit during the multipart upload process. The server will periodically clear the data pieces that have not been merged into blocks after uploading in about a month.

Create blocks (mkblk), upload pieces (bput), Create resources (mkfile).

## Front-end code:

<!doctype html>
<html lang="en">
<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">
  <script src="http://apps.bdimg.com/libs/jquery/2.1.4/jquery.js" ></script>
  <script src="./browser-md5-file.min.js" ></script>
  <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%;
    }
    .upload{
      margin-top: 40px;
    }
    .log
    {
        margin-top: 40px;
    }
  </style>
</head>
<body>
<p id="progress">
  <p id="finish" style="width: 0%;" progress="0"></p>
  <span id="rate"></span>
</p>

<p class="upload">
   <input type="file" name="file" id="file">
  <input type="button" value="开始上传" id="upstart">
  <input type="button" value="停止" id="stop">
  <input type="button" value="重新开始" id="restart">
</p>

<p class="log">
日志：<p id="plog"></p>
</p>
  

<script>
  var fileForm = document.getElementById("file");
  var upstartBtn = document.getElementById(&#39;upstart&#39;);
  var stopBtn = document.getElementById(&#39;stop&#39;);
  var startBtn = document.getElementById(&#39;restart&#39;);
  var rate = document.getElementById(&#39;rate&#39;);
  var plog = document.getElementById(&#39;plog&#39;);
  //---------------------------
  const LENGTH = 1024 * 1024 * 1;
  var start = 0;
  var end = start + LENGTH;
  var blob;
  var blob_num = 1;
  var is_stop = 0
  var file = null;  
  var md5filename = &#39;&#39;;
  
  //-----------------------------  
  var upload_instance = new Upload();
   
  fileForm.onchange = function()
  {
    browserMD5File(fileForm.files[0], function (err, md5) {
        md5filename = md5;
        plog.innerHTML = &#39;文件md5为：&#39; + md5filename;
    });
  } 
  upstartBtn.onclick = function(){
    upload_instance.addFileAndSend(fileForm);
  
  }
 
  stopBtn.onclick = function(){
    upload_instance.stop();
  }
  
  startBtn.onclick = function(){
    upload_instance.start();
  }
 
  function Upload(){
    var xhr = new XMLHttpRequest();
    var form_data = new FormData();
    

    //对外方法，传入文件对象
    this.addFileAndSend = function(that){
      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;
    }
    
    this.start = function(){
      sendFile(blob,file);  
      is_stop = 0;
    }
    
    //切割文件
    function cutFile(file){
       console.log("start========"+start);
       console.log("start========"+end);
      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;md5_file_name&#39;,md5filename);
      form_data.append(&#39;file_name&#39;,file.name);
 
      xhr.open(&#39;POST&#39;,&#39;./index.php&#39;,false);
      
      xhr.onreadystatechange = function () {
        
        console.log(xhr.readyState);
        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(&#39;progress-----&#39;+progress);
        progressObj.style.width = progress;
        rate.innerHTML = 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);
      }
      console.log(&#39;test&#39;);
      xhr.send(form_data);
    }
  }
 
</script>
</body>
</html>

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Backend code:

<?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
  private $md5FileName;
 
  public function __construct($tmpPath,$blobNum,$totalBlobNum,$fileName, $md5FileName){
    $this->tmpPath = $tmpPath;
    $this->blobNum = $blobNum;
    $this->totalBlobNum = $totalBlobNum;
    $this->fileName = $this->createName($fileName, $md5FileName);
    $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);
      $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);
    }
  }
  
  private function createName($fileName, $md5FileName){
     return $md5FileName . &#39;.&#39; . pathinfo($fileName)[&#39;extension&#39;];
  }
}
 
//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;],$_POST[&#39;file_name&#39;],$_POST[&#39;md5_file_name&#39;]);
//调用方法，返回结果
$upload->apiReturn();

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