我在 ColdFusion 项目中使用 XHR block 上传。除扩展名为 .txt 的文件外，所有类型的文件都可以正常上传。 当我尝试上传文本文件时，它将被上传并变空(文件大小变为 0 字节)。
为什么会发生这种情况？
这是我遇到的异常...
An exception occurred when executing method write.The cause of this exception was that: coldfusion.runtime.Cast$NumberConversionException: The value Hello this is a test file. cannot be converted to a number..
这是我的home.cfm
<html>
<head>
<title>Chunk Upload</title>
<style type="text/css">
.text-center{text-align: center;}
#alert{color: red}
#uploading, .filesize{color: red}
#success{color: green}
</style>
</head>
<body>
<script type="text/javascript">
var blobs = [];
function bytesToSize(bytes) {
var sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB'];
if (bytes == 0) return '0 Byte';
var i = parseInt(Math.floor(Math.log(bytes) / Math.log(1024)));
return Math.round(bytes / Math.pow(1024, i), 2) + ' ' + sizes[i];
};
/*
* function that uploads a fragment of the file
*/
function uploadChunk(blob, fileName, fileType, count){
var xhr = new XMLHttpRequest();
xhr.open('POST', 'chunkUpload.cfm', false);
xhr.onload = function(e){
document.getElementById("success").innerHTML = "Uploading... <span class='filesize'>" + count + "</span> MB";
}
xhr.setRequestHeader('X_FILE_NAME', fileName);
xhr.setRequestHeader('Content-Type', fileType)
// document.getElementById("uploading").innerHTML += "Uploading chunk of size " + blob.size + ".<br/>";
xhr.send(blob);
};
/*
* Invoke this function when the submit button is clicked.
*/
function uploadSubmit(){
var fileInputs = document.querySelectorAll('#userfile');
for (i = 0; i < fileInputs.length; i++) {
sliceFilesToFragments(fileInputs[i]);
}
};
/*
* function that slice the file into 1MB fragment
*/
function sliceFilesToFragments(input){
var count = 0;
var file = input.files[0];
// Upload 1 mb per chunk
var bytes_per_chunk = 1024 * 1024;
var start = 0;
var end = bytes_per_chunk;
var size = file.size;
document.getElementById("TotalSize").innerHTML += "Total File size <span class='filesize'>"+bytesToSize(size)+"</span>";
while (start < size) {
//push the fragments to an array
blobs.push(file.slice(start, end));
start = end;
end = start + bytes_per_chunk;
}
var blobArray = blobs.slice();
//upload the fragment to the server
while (blob = blobs.shift()) {
count++;
if(blobArray.length == count){
count = 'File Uploaded Successfully';
}
uploadChunk(blob, file.name, file.type, count);
}
};
</script>
<h2 class="text-center">Chunk Upload using XHR & CF</h2>
<form name="myform" method="post" enctype="multipart/form-data" >
<pre>
* notes *
1) Refresh Each time, before upload
2) Uploading 1 mb per chunk for now
3) To see the chunks: go to Chrome > inpect element > Network tab
</pre>
<pre>
Upload:<input type="file" id="userfile"><br>
</pre>
<pre>
<input type="button" id="submit" value="Submit" onclick="uploadSubmit()"><br>
</pre>
<pre><span id="TotalSize"></span></pre><br>
<pre><span id="success"></span></pre>
</form>
</body>
</html>这是我的chunkUpload.cfm
<cfoutput>
<cfset headerData = getHTTPRequestData().headers>
<cfset content = getHTTPRequestData().content>
<cfset filePath = expandPath("./Uploads/") & "#headerData.X_FILE_NAME#">
<cfset fos = createObject("java", "java.io.FileOutputStream").init(filePath, true)>
<cfset fos.write(content)>
<cfset fos.close()>
</cfoutput>有人可以帮我解决这个问题吗？
最佳答案
通过更改文件的内容类型解决了我的问题。如下更新您的内容类型
xhr.setRequestHeader('Content-Type', "application/octet-stream");
关于javascript - XHR block 上传在上传文本文件时出现一个问题，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/46427330/