使用html5分块上传文件

贺华容

2023-03-14

问题内容：

我正在尝试使用html5的File
API批量上传文件，然后在php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，文件大小增加了，并且变成了无效文件。请注意，以下html5代码仅适用于chrome浏览器。在Chrome
9中进行了测试，因为它使用了文件API的slice函数。有人可以指导我吗？谢谢

<?php

$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来源

<!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>

问题答案：

Slice Function接受第二个参数作为length。当as mozSlice接受第二个参数作为结束

使用html5分块上传文件

HTML来源

相关阅读

相关文章

相关问答

相关工具

相关文档