PHP大文件分割分片上传实现代码

吾爱主题阅读：210 2021-11-01 15:00:00 评论：0

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

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 <!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 //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

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 <?php class 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服务器之家。

原文链接：https://www.cnblogs.com/ghjbk/p/7443765.html

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