【cors跨域】H5 js跨域上传文件，C#服务端接收
H5原生js文件上传，带进度。
js代码：
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
</head>
<body>
<form action="">
<div>文件选择</div>
<input type="file" accept="audio/*" capture="microphone" id="fileToUpload" onchange="fileSelected()">
<div>
<div id="fileName"></div>
<div id="fileSize"></div>
<div id="fileType"></div>
</div>
<div id="progressNumber"></div>
<div><input type="button" value="上传" onclick="uploadFile()" /></div>
</form>
</body>
</html>
<script>
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() {
var fd = new FormData();
fd.append("fileToUpload", document.getElementById('fileToUpload').files[0]);
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", "http://192.168.137.20:8012/Handler1.ashx");
xhr.send(fd);
}
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("uploadFailed:" + JSON.stringify(evt));
}
function uploadCanceled(evt) {
alert("uploadCanceled:" + JSON.stringify(evt));
}
</script>
C#部分
public void ProcessRequest(HttpContext context)
{
HttpFileCollection files =context.Request.Files;
if (files != null && files.Count > 0)
{
string filename = files[0].FileName;
var filesave = "E:\\file\\" + filename;
files[0].SaveAs(filesave);
}
context.Response.ContentType = "text/plain";
context.Response.Write("Hello World");
}
C#配置cors允许请求头（通过webconfig配置），尝试过写入global的方式get可以，post不行（进不了global部分代码），未找到解决方案
<system.webServer>
<httpProtocol>
<customHeaders>
<add name="Access-Control-Allow-Origin" value="*" />
<add name="Access-Control-Allow-Headers" value="X-Requested-With,Content-Type" />
<add name="Access-Control-Allow-Methods" value="GET, POST, PUT, DELETE, OPTIONS" />
</customHeaders>
</httpProtocol>
</system.webServer>
