我正在尝试使用以下代码将 zip 文件从 asp.net web api 返回到客户端：
private byte[] CreateZip(string data)
{
using (var ms = new MemoryStream())
{
using (var ar = new ZipArchive(ms, ZipArchiveMode.Create, true))
{
var file = archive.CreateEntry("file.html");
using (var entryStream = file.Open())
using (var sw = new StreamWriter(entryStream))
{
sw .Write(value);
}
}
return memoryStream.ToArray();
}
}
public HttpResponseMessage Post([FromBody] string data)
{
HttpResponseMessage result = new HttpResponseMessage(HttpStatusCode.OK);
result.Content = new ByteArrayContent(CreateZip(data));
result.Content.Headers.ContentType = new MediaTypeHeaderValue("application/zip, application/octet-stream");
return result;
}
当我运行此代码时，出现以下错误：
ExceptionMessage":"值'application/zip的格式， application/octet-stream' 无效。”
这是JS代码：
$.ajax({
type: "POST",
url: url,
data: data,
dataType: application/x-www-form-urlencoded
});
有什么解释为什么会发生这种情况吗？我真的很感谢你们的帮助
$.ajaxxhr.responseType = "blob"xhr.response// with xhr.responseType = "arraybuffer"
var arraybuffer = xhr.response;
var blob = new Blob([arraybuffer], {type:"application/zip"});
saveAs(blob, "example.zip");
// with xhr.responseType = "blob"
var blob = xhr.response;
saveAs(blob, "example.zip");
Edit: examples:
with jquery.binarytransport.js（任何允许您下载 Blob 或 ArrayBuffer 的库都可以）
$.ajax({
url: url,
type: "POST",
contentType: "application/json",
dataType: "binary", // to use the binary transport
// responseType:'blob', this is the default
data: data,
processData: false,
success: function (blob) {
// the result is a blob, we can trigger the download directly
saveAs(blob, "example.zip");
}
// [...]
});
使用原始 XMLHttpRequest，您可以看到 this 问题，只需添加
xhr.responseType = "blob"我个人推荐你在jQuery上使用ajax传输，这很简单，你必须下载一个库，将其包含在项目中并编写：
dataType: "binary".这是 API 代码，使用 DotNetZip (
Ionic.Zip [HttpPost]
public HttpResponseMessage ZipDocs([FromBody] string[] docs)
{
using (ZipFile zip = new ZipFile())
{
//this code takes an array of documents' paths and Zip them
zip.AddFiles(docs, false, "");
return ZipContentResult(zip);
}
}
protected HttpResponseMessage ZipContentResult(ZipFile zipFile)
{
var pushStreamContent = new PushStreamContent((stream, content, context) =>
{
zipFile.Save(stream);
stream.Close();
}, "application/zip");
return new HttpResponseMessage(HttpStatusCode.OK) { Content = pushStreamContent };
}
这是我的解决方案，对我有用
C#方面
public IActionResult GetZip([FromBody] List<DocumentAndSourceDto> documents)
{
List<Document> listOfDocuments = new List<Document>();
foreach (DocumentAndSourceDto doc in documents)
listOfDocuments.Add(_documentService.GetDocumentWithServerPath(doc.Id));
using (var ms = new MemoryStream())
{
using (var zipArchive = new ZipArchive(ms, ZipArchiveMode.Create, true))
{
foreach (var attachment in listOfDocuments)
{
var entry = zipArchive.CreateEntry(attachment.FileName);
using (var fileStream = new FileStream(attachment.FilePath, FileMode.Open))
using (var entryStream = entry.Open())
{
fileStream.CopyTo(entryStream);
}
}
}
ms.Position = 0;
return File(ms.ToArray(), "application/zip");
}
throw new ErrorException("Can't zip files");
}
不要错过这里
ms.Position = 0;正面（角度4）：
downloadZip(datas: any) {
const headers = new Headers({
'Content-Type': 'application/json',
'Accept': 'application/zip'
});
const options = new RequestOptions({ headers: headers, withCredentials: true, responseType: ResponseContentType.ArrayBuffer });
const body = JSON.stringify(datas);
return this.authHttp.post(`${environment.apiBaseUrl}api/documents/zip`, body, options)
.map((response: Response) => {
const blob = new Blob([response.blob()], { type: 'application/zip' });
FileSaver.saveAs(blob, 'logs.zip');
})
.catch(this.handleError);
}
现在我可以下载多个文件进行压缩。
[HttpGet("api/DownloadZip")]
public async Task<IActionResult> Download()
{
var path = "C:\\test.zip";
var memory = new MemoryStream();
using (var stream = new FileStream(path, FileMode.Open))
{
await stream.CopyToAsync(memory);
}
memory.Position = 0;
return File(memory, GetContentType(path), Path.GetFileName(path));
}
class Program
{
static string url = "http://localhost:5000/api/DownloadZip";
static async Task Main(string[] args)
{
var p = @"c:\temp1\test.zip";
WebClient webClient = new WebClient();
webClient.DownloadFile(new Uri(url), p);
Console.WriteLine("ENTER to exit...");
Console.ReadLine();
}
}
您传递给
MediaTypeHeaderValue内容类型标头采用单个类型/子类型，后跟用分号分隔的可选参数
;例如：
Content-Type: text/html; charset=ISO-8859-4
对于您的结果，您需要决定要使用哪一个。
application/zipapplication/octet-streamresult.Content.Headers.ContentType = new MediaTypeHeaderValue("application/zip");
另外，为了避免异常，您可以使用
MediaTypeHeaderValue.TryParsevar contentTypeString = "application/zip";
MediaTypeHeaderValue contentType = null;
if(MediaTypeHeaderValue.TryParse(contentTypeString, out contentType)) {
result.Content.Headers.ContentType = contentType;
}
如果您想将其作为可下载文件返回。尝试这个。返回类型可以是 IActionResult
var theJson = JsonConvert.SerializeObject(result);
using (var zipStream = new MemoryStream())
{
using (var zipArchive = new ZipArchive(zipStream, ZipArchiveMode.Create, leaveOpen: true))
{
var entry = zipArchive.CreateEntry("data.json");
using (var entryStream = entry.Open())
using (var jsonStreamWriter = new StreamWriter(entryStream))
{
jsonStreamWriter.Write(theJson);
}
}
// Reset zip stream to point at the beginning of data
zipStream.Seek(0, SeekOrigin.Begin);
// Set the response headers
//Response.Headers.Add("Content-Disposition", "attachment; filename=compressed_response.zip");
// Return zip file containing JSON data as response
return File(zipStream.ToArray(), "application/zip");
}