[英]uploading a file in chunks using html5 , javascript and PHP
基本上我必須逐塊上傳文件，因為文件非常大，我嘗試使用此解決方案使用 html5 分塊上傳文件，但文件已損壞，因為重建的文件不按順序排列。
我試圖實現鏈接中給出的答案，但我真的很困惑如何在我的 php 頁面和我的 html 頁面上實現它。 如果你們能給我一個建議或方法，那就太好了。 感謝您的時間。
編碼：
上傳.php
<?php
$target_path = "/home/imagesdcard/www/";
$tmp_name = $_FILES['fileToUpload']['tmp_name'];
$size = $_FILES['fileToUpload']['size'];
$name = $_FILES['fileToUpload']['name'];
$target_file = $target_path . basename($name);
$complete = "test.txt";
$com = fopen("/home/imagesdcard/www/".$complete, "ab");
error_log($target_path);
// Open temp file
$out = fopen($target_file, "wb");
if ( $out ) {
// Read binary input stream and append it to temp file
$in = fopen($tmp_name, "rb");
if ( $in ) {
while ( $buff = fread( $in, 1024) ) {
fwrite($out, $buff);
fwrite($com, $buff);
}
}
fclose($in);
fclose($out);
}
fclose($com);
?>
html
<!DOCTYPE html>
<html>
<head>
<title>Upload Files using XMLHttpRequest</title>
<script type="text/javascript">
window.BlobBuilder = window.MozBlobBuilder || window.WebKitBlobBuilder || window.BlobBuilder;
function sendRequest() {
var blob = document.getElementById('fileToUpload').files[0];
const BYTES_PER_CHUNK = 1048576; // 1MB chunk sizes.
const SIZE = blob.size;
var i=0;
var start = 0;
var end = BYTES_PER_CHUNK;
while( start < SIZE ) {
var chunk = blob.slice(start, end);
uploadFile(chunk,i);
i++;
start = end;
end = start + BYTES_PER_CHUNK;
}
}
function fileSelected() {
var file = document.getElementById('fileToUpload').files[0];
if (file) {
var fileSize = 0;
if (file.size > 1024 * 1024)
fileSize = (Math.round(file.size * 100 / (1024 * 1024)) / 100).toString() + 'MB';
else
fileSize = (Math.round(file.size * 100 / 1024) / 100).toString() + 'KB';
document.getElementById('fileName').innerHTML = 'Name: ' + file.name;
document.getElementById('fileSize').innerHTML = 'Size: ' + fileSize;
document.getElementById('fileType').innerHTML = 'Type: ' + file.type;
}
}
function uploadFile(blobFile,part) {
//var file = document.getElementById('fileToUpload').files[0];
var fd = new FormData();
fd.append("fileToUpload", blobFile);
var xhr = new XMLHttpRequest();
xhr.upload.addEventListener("progress", uploadProgress, false);
xhr.addEventListener("load", uploadComplete, false);
xhr.addEventListener("error", uploadFailed, false);
xhr.addEventListener("abort", uploadCanceled, false);
xhr.open("POST", "upload.php?num="+part);
xhr.onload = function(e) {
alert("loaded!");
};
xhr.send(fd);
//alert("oen over");
}
function uploadProgress(evt) {
if (evt.lengthComputable) {
var percentComplete = Math.round(evt.loaded * 100 / evt.total);
document.getElementById('progressNumber').innerHTML = percentComplete.toString() + '%';
}
else {
document.getElementById('progressNumber').innerHTML = 'unable to compute';
}
}
function uploadComplete(evt) {
/* This event is raised when the server send back a response */
alert(evt.target.responseText);
}
function uploadFailed(evt) {
alert("There was an error attempting to upload the file.");
}
function uploadCanceled(evt) {
xhr.abort();
xhr = null;
//alert("The upload has been canceled by the user or the browser dropped the connection.");
}
</script>
</head>
<body>
<form id="form1" enctype="multipart/form-data" method="post" action="upload.php">
<div class="row">
<label for="fileToUpload">Select a File to Upload</label><br />
<input type="file" name="fileToUpload" id="fileToUpload" onchange="fileSelected();"/>
<input type="button" value="cancel" onClick="uploadCanceled();"/>
</div>
<div id="fileName"></div>
<div id="fileSize"></div>
<div id="fileType"></div>
<div class="row">
<input type="button" onclick="sendRequest();" value="Upload" />
</div>
<div id="progressNumber"></div>
</form>
</body>
</html>
您的腳本不起作用，因為 js 是異步的。 您應該將代碼更改為：
xhr.open("POST", "upload.php?num="+part, false);
和文件保存正常。
我按塊上傳大文件的解決方案。
上傳.php （php部分）
<?php
session_start();
if($_SERVER["REQUEST_METHOD"] == "POST")
{
$chunk = $_FILES["chunk"]["tmp_name"];
$filename = $_POST['filename'];
if(!isset($_SESSION[$filename]))
{
$_SESSION[$filename] = tempnam(sys_get_temp_dir(), 'upl');
}
$tmpfile = $_SESSION[$filename];
if(isset($chunk))
{
file_put_contents($tmpfile, file_get_contents($chunk), FILE_APPEND);
}
else
{
rename($tmpfile, $filename);
}
exit();
}
?>
upload.php （html\js 部分）
<!DOCTYPE html>
<html>
<head>
<title>Upload Files using XMLHttpRequest</title>
<script src="https://code.jquery.com/jquery-3.6.0.js"></script>
<script type="text/javascript">
function sendRequest() {
// 1MB chunk sizes.
var chunk_size = 1048570;
var file = document.getElementById('file').files[0];
var filesize = file.size;
var filename = file.name;
var pos = 0;
while(pos < filesize) {
let chunk = file.slice(pos, pos+chunk_size);
pos += chunk_size;
var data = new FormData();
data.append('chunk', chunk);
data.append('filename', filename);
$.ajax({url:'upload.php',type: 'post',async:false,data: data,processData: false,contentType: false});
let percentComplete = Math.round(pos * 100 / filesize);
document.getElementById('progressNumber').innerHTML = (percentComplete > 100 ? 100 : percentComplete) + '%';
}
$.post('upload.php',{filename:filename});
}
</script>
</head>
<body>
<form>
<div class="row">
<label for="file">Select a File to Upload</label><br />
<input type="file" name="file" id="file" onchange="sendRequest();"/>
</div>
<div id="progressNumber"></div>
</form>
</body>
</html>
但此代碼有一個錯誤 - 進度條在 chrome 中不起作用，僅在 firefox 中起作用。
如果您想在 chrome 瀏覽器中工作，您應該發出異步請求並發出遞歸 function，例如： upload.php (PHP)
<?php
session_start();
$chunk_size = 1048570;
if($_SERVER["REQUEST_METHOD"] == "POST")
{
header("Content-type: application/json; charset=UTF-8");
header("Cache-Control: must-revalidate");
header("Pragma: no-cache");
header("Expires: -1");
$filename = $_POST["filename"];
$chunk = $_FILES["chunk"]["tmp_name"];
$from = intval($_POST["from"]);
$upload = new stdClass();
if(!isset($_SESSION[$filename]))
$_SESSION[$filename] = tempnam(sys_get_temp_dir(), 'upl');
$tmpfile = $_SESSION[$filename];
if(isset($chunk))
file_put_contents($tmpfile, file_get_contents($chunk), FILE_APPEND);
$upload->from = $from + $chunk_size;
$upload->filesize = $_POST['filesize'];
$upload->filename = $filename;
if($upload->from >= $upload->filesize)
{
rename($tmpfile, "test.file");
unset($_SESSION[$filename]);
}
print json_encode($upload);
exit();
}
上傳.php (HTML\JS)
<!DOCTYPE html>
<html>
<head>
<title>Upload Files using XMLHttpRequest</title>
<script src="https://code.jquery.com/jquery-3.6.0.js"></script>
<script type="text/javascript">
var chunk_size = '<?php echo $chunk_size; ?>';
function do_request(from)
{
var file = $("#file").get(0).files[0];
var data = new FormData();
data.append('chunk', file.slice(from, from+chunk_size));
data.append('filename', file.name);
data.append('filesize', file.size);
data.append('from', from);
$.ajax({
url: "upload.php", type: "post", data:data, processData:false, contentType:false, dataType: 'json',
success: function(data)
{
$("#progress").val((data.from / data.filesize) * 100);
if(data.from < data.filesize)
do_request(data.from);
}
});
}
</script>
</head>
<body>
<form>
<div class="row">
<label for="file">Select a File to Upload</label><br />
<input type="file" name="file" id="file" onchange="do_request(0);"/>
</div>
<progress id="progress" min="0" max="100" value="0"></progress>
</form>
</body>
</html>
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