在ASP.NET中,实现FileUpload的断点续传可以通过以下步骤来完成:
<input type="file">
元素来允许用户选择文件,并设置multiple
属性以允许选择多个文件。<input type="file" id="fileInput" multiple />
change
事件,并将选中的文件列表存储在变量中。let fileList = [];
document.getElementById('fileInput').addEventListener('change', function (event) {
fileList = Array.from(event.target.files);
});
Content-Range
头部以实现断点续传。function uploadChunk(chunk, fileName, startIndex, totalChunks) {
const formData = new FormData();
formData.append('file', chunk, fileName);
formData.append('startIndex', startIndex);
formData.append('totalChunks', totalChunks);
fetch('/upload', {
method: 'POST',
body: formData
})
.then(response => response.json())
.then(data => {
if (data.success) {
console.log('Chunk uploaded successfully');
} else {
console.error('Chunk upload failed:', data.message);
}
})
.catch(error => {
console.error('Error uploading chunk:', error);
});
}
Content-Range
头部,并根据该头部来确定当前上传的文件的起始位置和总块数。[HttpPost("upload")]
public async Task<IActionResult> UploadChunk([FromBody] byte[] chunk, [FromForm] string fileName, [FromForm] long startIndex, [FromForm] int totalChunks)
{
// 检查文件是否已经上传完毕
if (totalChunks == 1)
{
// 将文件保存到服务器
var filePath = Path.Combine(Directory.GetCurrentDirectory(), "uploads", fileName);
File.WriteAllBytes(filePath, chunk);
return Ok();
}
// 获取文件的临时路径
var tempPath = Path.Combine(Path.GetTempPath(), "uploads", fileName);
// 将当前块追加到文件中
File.AppendAllBytes(tempPath, chunk);
// 更新已上传的总块数
var totalBytesUploaded = new FileInfo(tempPath).Length;
var totalChunksUploaded = GetTotalChunksUploaded(fileName);
SetTotalChunksUploaded(fileName, totalChunksUploaded + 1);
// 检查所有块是否已上传完毕
if (totalBytesUploaded == GetFileSize(fileName))
{
// 将文件移动到最终位置
var finalPath = Path.Combine(Directory.GetCurrentDirectory(), "uploads", fileName);
File.Move(tempPath, finalPath);
return Ok();
}
return Ok();
}
function continueUpload() {
const file = fileList[0];
const startIndex = GetStartIndexOfUploadedChunk(file.name);
const totalChunks = GetTotalChunks(file.name);
const chunkSize = 1024 * 1024; // 1MB
for (let i = startIndex; i < totalChunks; i++) {
const start = i * chunkSize;
const end = Math.min(start + chunkSize, GetFileSize(file.name));
const chunk = GetChunkFromFile(file.name, start, end);
uploadChunk(chunk, file.name, start, totalChunks);
}
}
通过以上步骤,可以实现一个基本的断点续传功能。在实际应用中,还需要考虑更多的细节,例如错误处理、并发控制、文件分片等。
亿速云「云服务器」,即开即用、新一代英特尔至强铂金CPU、三副本存储NVMe SSD云盘,价格低至29元/月。点击查看>>
推荐阅读:asp.net fileupload怎样实现文件分类