使用 HTML5 分块，我可以用较小的部分进行文件上传。但是当它开始使用多个 http POST 请求时问题就开始了，这将导致计算机速度变慢，或者可能崩溃。反正有没有在一个http请求下分割文件..所以如果我有5个文件，即使我使用html5分割块，它也只有5个http请求
eg：如果我上传5个文件，每个文件将被分割成1mb块，所以如果第一个文件是10mb，那么它将变成10个1mb块。问题是，每个块都将在 1 个 http 请求下，所以只有第一个文件将是 10 个 HTTP 请求。想象一下，如果我有 1gb 的文件，它将变成 1000 个 HTTP 请求并降低计算机的速度。
这是示例代码：
//Prepare element progress after the page load completely
var uploaders = [];
var totalChunks = 0;
var progress;
var bars;
$(document).ready(function() {
//progress = document.querySelector('progress');
//bars = document.querySelector('#bars');
});
//function for after the button is clicked, slice the file
//and call upload function
function sendRequest() {
//clean the screen
//bars.innerHTML = '';
var file = document.getElementById('fileToUpload');
for(var i = 0; i < file.files.length; i++) {
var blob = file.files[i];
var originalFileName = blob.name;
var filePart = 0
const BYTES_PER_CHUNK = 10 * 1024 * 1024; // 10MB chunk sizes.
const SIZE = blob.size;
var start = 0;
var end = BYTES_PER_CHUNK;
totalChunks = Math.ceil(SIZE / BYTES_PER_CHUNK);
while( start < SIZE ) {
if (blob.webkitSlice) {
//for Google Chrome
var chunk = blob.webkitSlice(start, end);
} else if (blob.mozSlice) {
//for Mozilla Firefox
var chunk = blob.mozSlice(start, end);
}
uploadFile(chunk, originalFileName, filePart, totalChunks, i);
filePart++;
start = end;
end = start + BYTES_PER_CHUNK;
}
}
}
function uploadFile(blobFile, fileName) {
var fd = new FormData();
fd.append("fileToUpload", blobFile);
var xm = $.ajax({
url: "upload.php"+"?"+"file1="+fileName,
type: "POST",
data: fd,
processData: false,
contentType: false,
});
}
function uploadFile(blobFile, fileName, filePart, totalChunks, divBarsSelector) {
if(filePart == 0) {
bars = document.querySelector('#bars' + divBarsSelector);
}
var progress = document.createElement('progress');
progress.min = 0;
progress.max = 100;
progress.value = 0;
bars.appendChild(progress);
var fd = new FormData();
fd.append("fileToUpload", blobFile);
var xhr = new XMLHttpRequest();
xhr.open("POST", "upload.php"+"?"+"file="+fileName + filePart, true);
xhr.onload = function(e) {
//make sure if finish progress bar at 100%
progress.value = 100;
//counter if everything is done using stack
uploaders.pop();
if (!uploaders.length) {
bars.appendChild(document.createElement('br'));
bars.appendChild(document.createTextNode('DONE :)'));
//mergeFile(fileName, totalChunks);
}
};
// Listen to the upload progress for each upload.
xhr.upload.onprogress = function(e) {;
if (e.lengthComputable) {
progress.value = (e.loaded / e.total) * 100;
}
};
uploaders.push(xhr);
xhr.send(fd);
}
接收的服务器部分是upload.php
$target_path = "uploads/";
$tmp_name = $_FILES['fileToUpload']['tmp_name'];
$size = $_FILES['fileToUpload']['size'];
$name = $_FILES['fileToUpload']['name'];
$originalName = $_GET['file'];
print_r("*******************************************\n");
print_r($originalName);
print_r("\n");
print_r($_FILES);
print_r("\n");
print_r("*******************************************\n");
$target_file = $target_path . basename($name);
//Result File
$complete = $originalName;
$com = fopen("uploads/".$complete, "ab");
error_log($target_path);
if ( $com ) {
// Read binary input stream and append it to temp file
$in = fopen($tmp_name, "rb");
if ( $in ) {
while ( $buff = fread( $in, 1048576 ) ) {
fwrite($com, $buff);
}
}
fclose($in);
fclose($com);
}