我在线复制了一个代码，将一个大文件上传到我的服务器。它基本上将大文件切成 block 并发送然后单独结束它们。所以第一个 block 成功发送到服务器，但其余的只是不起作用。我不确定是哪个阶段导致了问题，请有人帮忙。
<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 start = 0;
var i =0;
var part = 0;
while( start < SIZE ) {
var chunk = blob.slice(start, BYTES_PER_CHUNK);
//alert(chunk.size());
uploadFile(chunk,part);
//alert("here");
start = start + BYTES_PER_CHUNK;
part++;
}
}
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"+"?"+"file="+file.name+"&num=" + part);
xhr.onload = function(e) {
//alert("loaded!");
};
xhr.setRequestHeader('Cache-Control','no-cache');
xhr.send(fd);
return;
//while(xhr.readyState!=4){}
//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>
服务器上的代码
$target_path = "uploads/";
$tmp_name = $_FILES['fileToUpload']['tmp_name'];
$size = $_FILES['fileToUpload']['size'];
$name = $_FILES['fileToUpload']['name'];
$sports = $_GET['file'];
$part =(string)$_GET['num'];
//$part = split("/\=/", $part);
$target_file = $target_path .$part. $sports;
// 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( $in, 1048576 ) ) {
fwrite($out, $buff);
}
}
fclose($in);
fclose($out);
}
?>
最佳答案
上面的代码有一个问题。 您正在像这样在 while 循环中调用 uploadFile..
while( start < SIZE ) {
var chunk = blob.slice(start, BYTES_PER_CHUNK);
//alert(chunk.size());
uploadFile(chunk,part);
//alert("here");
start = start + BYTES_PER_CHUNK;
part++;
}
你不是在等待 block 加载成功!!你继续上传 block 直到结束。您可以等待一个 block 上传成功，然后加载下一个。
我觉得你可以尝试以下..
var blob;
var start;
var part;
var chunk;
const SIZE = blob.size;
var xhr;
function sendRequest() {
blob = document.getElementById('fileToUpload').files[0];
const BYTES_PER_CHUNK = 1048576; // 1MB chunk sizes.
const SIZE = blob.size;
start = 0;
part = 0;
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"+"?"+"file="+file.name+"&num=" + part);
xhr.onload = function(e) {
//alert("loaded!");
};
xhr.setRequestHeader('Cache-Control','no-cache');
chunk = blob.slice(start, BYTES_PER_CHUNK);
//alert(chunk.size());
uploadFile(chunk,part);
//alert("here");
start = start + BYTES_PER_CHUNK;
part++;
}
function uploadFile(blobFile,part) {
var file = document.getElementById('fileToUpload').files[0];
var fd = new FormData();
fd.append("fileToUpload", blobFile);
xhr.send(fd);
return;
//while(xhr.readyState!=4){}
//alert("oen over");
}
function uploadComplete(evt) {
/* This event is raised when the server send back a response */
alert(evt.target.responseText);
while( start < SIZE ) {
chunk = blob.slice(start, BYTES_PER_CHUNK);
//alert(chunk.size());
uploadFile(chunk,part);
//alert("here");
start = start + BYTES_PER_CHUNK;
part++;
}
}
关于php - Javascript大文件 uploader ，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/13792538/