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PHP大文件分割上传 PHP分片上传

2017年09月07日 PHP博文 暂无评论

服务端为什么不能直接传大文件?跟php.ini里面的几个配置有关

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

当然不能简单粗暴的把上面几个值调大,否则服务器内存资源吃光是迟早的问题。

解决思路

好在HTML5开放了新的FILE API,也可以直接操作二进制对象,我们可以直接在浏览器端实现文件切割,按照以前的做法就得用Flash的方案,实现起来会麻烦很多。

JS思路
1.监听上传按钮的onchange事件
2.获取文件的FILE对象
3.把文件的FILE对象进行切割,并且附加到FORMDATA对象中
4.把FORMDATA对象通过AJAX发送到服务器
5.重复3、4步骤,直到文件发送完。

PHP思路
1.建立上传文件夹
2.把文件从上传临时目录移动到上传文件夹
3.所有的文件块上传完成后,进行文件合成
4.删除文件夹
5.返回上传后的文件路径

DEMO代码

前端部分代码

<!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">  <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><div id="progress">  <div id="finish" style="width: 0%;" progress="0"></div></div><form action="./upload.php">  <input type="file" name="file" id="file">  <input type="button" value="http://www.jb51.net/article/停止" id="stop"></form><script>  var fileForm = document.getElementById("file");  var stopBtn = document.getElementById('stop');  var upload = new Upload();  fileForm.onchange = function(){    upload.addFileAndSend(this);  }  stopBtn.onclick = function(){    this.value = "http://www.jb51.net/article/停止中";    upload.stop();    this.value = "http://www.jb51.net/article/已停止";  }  function Upload(){    var xhr = new XMLHttpRequest();    var form_data = http://www.jb51.net/article/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('file',blob);      form_data.append('blob_num',blob_num);      form_data.append('total_blob_num',total_blob_num);      form_data.append('file_name',file.name);      xhr.open('POST','./upload.php',false);      xhr.onreadystatechange = function () {        var progress;        var progressObj = document.getElementById('finish');        if(total_blob_num == 1){          progress = '100%';        }else{          progress = Math.min(100,(blob_num/total_blob_num)* 100 ) +'%';        }        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>

PHP部分代码

<?phpclass Upload{  private $filepath = './upload'; //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){      $blob = '';      for($i=1; $i<= $this->totalBlobNum; $i++){        $blob .= file_get_contents($this->filepath.'/'. $this->fileName.'__'.$i);      }      file_put_contents($this->filepath.'/'. $this->fileName,$blob);      $this->deleteFileBlob();    }  }    //删除文件块  private function deleteFileBlob(){    for($i=1; $i<= $this->totalBlobNum; $i++){      @unlink($this->filepath.'/'. $this->fileName.'__'.$i);    }  }    //移动文件  private function moveFile(){    $this->touchDir();    $filename = $this->filepath.'/'. $this->fileName.'__'.$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.'/'. $this->fileName)){          $data['code'] = 2;          $data['msg'] = 'success';          $data['file_path'] = 'http://'.$_SERVER['HTTP_HOST'].dirname($_SERVER['DOCUMENT_URI']).str_replace('.','',$this->filepath).'/'. $this->fileName;        }    }else{        if(file_exists($this->filepath.'/'. $this->fileName.'__'.$this->blobNum)){          $data['code'] = 1;          $data['msg'] = 'waiting for all';          $data['file_path'] = '';        }    }    header('Content-type: application/json');    echo json_encode($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['file']['tmp_name'],$_POST['blob_num'],$_POST['total_blob_num'],$_POST['file_name']);//调用方法,返回结果$upload->apiReturn();

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持E网新时代。

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