【发布时间】：2011-12-12 19:11:30
【问题描述】：
我正在尝试使用 html5 的文件 API 分块上传文件，然后在 php.ini 的服务器端重新组装它。我正在上传视频，但是当我在服务器端合并文件时，大小增加了，它变成了无效文件。请注意以下 html5 代码仅适用于浏览器 chrome 。在 Chrome 9 中测试，因为它使用了文件 API 的 slice 函数。 有人可以指导我吗？ 谢谢
PHP 源码
<?php
$target_path = "uploads/";
$tmp_name = $_FILES['fileToUpload']['tmp_name'];
$size = $_FILES['fileToUpload']['size'];
$name = $_FILES['fileToUpload']['name'];
$target_file = $target_path . basename($name);
$complete = "complete.mov";
$com = fopen("uploads/".$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( $in, 1048576 ) ) {
fwrite($out, $buff);
fwrite($com, $buff);
}
}
fclose($in);
fclose($out);
}
fclose($com);
?>
HTML 源代码
<!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 start = 0;
var end = BYTES_PER_CHUNK;
while( start < SIZE ) {
var chunk = blob.slice(start, end);
uploadFile(chunk);
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) {
//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");
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>
【问题讨论】：
-
文件大小增加了多少？
-
嗨，马特，文件大小增加了 2 倍以上
-
所以你达到了服务器端的大小限制，对吗？更改该限制不是一种选择吗？ （虽然我发现现在可以进行分块上传很有趣，很酷！）
-
没有服务器端文件增加，因此成为无效文件
-
不，我的意思是为什么你首先需要分块上传？