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php大文件切片上传（php分片上传文件）

hmc789 2024-11-15 19:34:26 技术文章 2 ℃

前端代码

```

<!doctype html>

<head>

content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">

<title>文件断点续传</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>

</form>

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 * 5;//每次上传5M

var start = 0;//每次切片开始

var end = start + LENGTH;//每次切片结束

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 = new FormData();

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>

```

后台代码

```

<?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();

```

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