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
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(nèi)存上限
max_execution_time = 30 //最大執(zhí)行時間
當然不能簡單粗暴的把上面幾個值調大，否則服務器內(nèi)存資源吃光是遲早的問題。
解決思路
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。
JS思路
1.監(jiān)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，并且附加到FORMDATA對象中
4.把FORMDATA對象通過AJAX發(fā)送到服務器
5.重復3、4步驟，直到文件發(fā)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
前端部分代碼
!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(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部分代碼
?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();
以上就是本文的全部內(nèi)容，希望對大家的學習有所幫助，也希望大家多多支持腳本之家。
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