formdata方式上傳文件，支持大文件分割上傳

本文轉載自查看原文 2019-10-24 16:35 696 php/ html

1、upload.html

<!DOCTYPE html>  
<html xmlns="http://www.w3.org/1999/html">  
<head>  
    <meta http-equiv="content-type" content="text/html; charset=utf-8"/>
<html>  
<head>  
<title></title>  

</head>  
  
<body>  
<form enctype="multipart/form-data" id="uploadImg">
    上傳文件:  
    <input name="file" type="file" id="file"> 
</form>
</body>  
</html>
<script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script>
<script>
    $(function(){
        $('input[type="file"]').on('change', function(){
            var file = this.files[0];
            var formData = new FormData($('#uploadImg')[0]);
            formData.append('file', file);
            console.log(formData.get('file'))
            $.ajax({
                url: 'upload.php',
                type: 'POST',
                cache: false,
                data: formData,
                //dataType: 'json',
                //async: false,
                processData: false,    //不需要對數據做任何預處理
                contentType: false,    //不設置數據格式
            }).done(function(res) {
                console.log(res)
            }).fail(function(res) {
                console.log(res)
            });
        });
    })
</script>

2、upload.php

<?php
header("Content-type:text/html;charset=utf-8"); 
    //print_r($_FILES);    
    $uptypes=array(  
        'image/jpg',  
        'image/jpeg',  
        'image/png',  
        'image/pjpeg',  
        'image/gif',  
        'image/bmp',  
        'image/x-png'  
    );

    $max_file_size=200000000;     //上傳文件大小限制, 單位BYTE
    
    $file=$_FILES["file"];
    $fileName=$file["name"];
    $filetype = $file["type"];
    $filesize = $file["size"];
    
    if(!in_array($filetype, $uptypes)){            // 文件類型判斷
        echo "文件類型不符!";
        exit;
    }
    if($filesize > $max_file_size){                // 文件大小判斷
        echo "文件太大!";
        exit;    
    }
    if (!is_dir("image/")) {                    //創建路徑
        mkdir("image/");
    }
    $url = "image/";
    //當文件存在
    if (file_exists($url.$fileName)) {
        //echo $fileName." already exists.";
        echo $url.$fileName;
    }else{//當文件不存在
        $url=$url.$fileName;
        move_uploaded_file($_FILES["file"]["tmp_name"],$url);
        echo $url;
    }
?>

大文件分割上傳

JS思路
1.監聽上傳按鈕的onchange事件
2.獲取文件的FILE對象
3.把文件的FILE對象進行切割，並且附加到FORMDATA對象中
4.把FORMDATA對象通過AJAX發送到服務器
5.重復3、4步驟，直到文件發送完。

PHP思路
1.建立上傳文件夾
2.把文件從上傳臨時目錄移動到上傳文件夾
3.所有的文件塊上傳完成后，進行文件合成
4.刪除文件夾
5.返回上傳后的文件路徑

DEMO代碼

<!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="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 = "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
    //對外方法，傳入文件對象
    this.addFileAndSend = function(that){
      var file = that.files[0];
      blob = cutFile(file);
      sendFile(blob,file);
      blob_num += 1;
    }
    //停止文件上傳
    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; }; //發送文件
    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代碼部分

<?php
class Upload{
  private $filepath = './upload'; //上傳目錄
  private $tmpPath; //PHP文件臨時目錄
  private $blobNum; //第幾個文件塊
  private $totalBlobNum; //文件塊總數
  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();
  }
   
  //判斷是否是最后一塊，如果是則進行文件合成並且刪除文件塊
  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();
    }
  }
   
  //刪除文件塊
  private function deleteFileBlob(){
    for($i=1; $i<= $this->totalBlobNum; $i++){
      @unlink($this->filepath.'/'. $this->fileName.'__'.$i);
    }
  }
   
  //移動文件
  private function moveFile(){
    $this->touchDir();
    $filename = $this->filepath.'/'. $this->fileName.'__'.$this->blobNum;
    move_uploaded_file($this->tmpPath,$filename);
  }
   
  //API返回數據
  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);
  }
   
  //建立上傳文件夾
  private function touchDir(){
    if(!file_exists($this->filepath)){
      return mkdir($this->filepath);
    }
  }
}
 
//實例化並獲取系統變量傳參
$upload = new Upload($_FILES['file']['tmp_name'],$_POST['blob_num'],$_POST['total_blob_num'],$_POST['file_name']);
//調用方法，返回結果
$upload->apiReturn();

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