《PHP應用：PHP搭建大文件切割分塊上傳功能示例》要點：
本文介紹了PHP應用：PHP搭建大文件切割分塊上傳功能示例，希望對您有用。如果有疑問，可以聯(lián)系我們。
PHP實例背景
PHP實例在網(wǎng)站開發(fā)中,文件上傳是很常見的一個功能.相信很多人都會遇到這種情況,想傳一個文件上去,然后網(wǎng)頁提示“該文件過大”.因為一般情況下,我們都需要對上傳的文件大小做限制,防止出現(xiàn)意外的情況.
?但是在有些業(yè)務場景中,大文件上傳又是必須的,比如郵箱附件,或者內部OA等等.
PHP實例問題
PHP實例服務端為什么不能直接傳大文件?跟php.ini里面的幾個配置有關
PHP實例
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 //內存上限
max_execution_time = 30 //最大執(zhí)行時間
PHP實例當然不能簡單粗暴的把上面幾個值調大,否則服務器內存資源吃光是遲早的問題.
PHP實例解決思路
PHP實例好在HTML5開放了新的FILE API,也可以直接操作二進制對象,我們可以直接在瀏覽器端實現(xiàn)文件切割,按照以前的做法就得用Flash的方案,實現(xiàn)起來會麻煩很多.
PHP實例JS思路
PHP實例1.監(jiān)聽上傳按鈕的onchange事件
PHP實例2.獲取文件的FILE對象
PHP實例3.把文件的FILE對象進行切割,并且附加到FORMDATA對象中
PHP實例4.把FORMDATA對象通過AJAX發(fā)送到服務器
PHP實例5.重復3、4步驟,直到文件發(fā)送完.
PHP實例PHP思路
PHP實例1.建立上傳文件夾
PHP實例2.把文件從上傳臨時目錄移動到上傳文件夾
PHP實例3.所有的文件塊上傳完成后,進行文件合成
PHP實例4.刪除文件夾
PHP實例5.返回上傳后的文件路徑
PHP實例DEMO代碼
PHP實例前端部分代碼
PHP實例
<!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(fā)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實例PHP部分代碼
PHP實例
<?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(shù)
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();
$this->fileMerge();
}
//判斷是否是最后一塊,如果是則進行文件合成并且刪除文件塊
private function fileMerge(){
if($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(shù)據(jù)
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);
}
}
}
//實例化并獲取系統(tǒng)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();
PHP實例存在的問題
PHP實例這只是一個簡單的DEMO,有很多地方需要改進,比如上傳的文件夾與臨時文件放在一起,用戶中途取消也沒有發(fā)請求進行清理,容易造成文件冗余.JS采用的是同步模型,文件需要一塊一塊按順序上傳,會導致整個瀏覽器在上傳的過程中出于堵塞的狀態(tài),按了按鈕可能需要幾秒鐘才能反應過來,用戶體驗不好.真正需要產品化的時候就要綜合考慮多種情況,當然作為一個示例,引導大家了解分塊上傳的思路還是不錯的.
PHP實例以上就是本文的全部內容,希望對大家的學習有所幫助,也希望大家多多支持維易PHP.
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