iText 7 从 Asp.Net WebApi 返回 Pdf
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【中文标题】iText 7 从 Asp.Net WebApi 返回 Pdf【英文标题】:iText 7 return Pdf from Asp.Net WebApi 【发布时间】:2019-01-10 11:36:02 【问题描述】:所以我整天都在搜索这个,我只是不知道如何让它工作。基本上我想在我的 ASP.Net WebApi 中使用 iText 7 创建一个 PDF 服务器端。非常简单明了的 PDF 创建:
[HttpGet]
public HttpResponseMessage CreateLieferschein()
MemoryStream stream = new MemoryStream();
PdfWriter writer = new PdfWriter(stream);
var pdf = new PdfDocument(writer);
var document = new Document(pdf);
document.Add(new Paragraph("Hello World!"));
从这里开始,我不知道如何从控制器返回文件。我真的很感激任何帮助,因为我刚刚迷路了。
【问题讨论】:
【参考方案1】:试试这个:
[HttpGet]
public HttpResponseMessage CreateLieferschein()
Document doc = new Document(iTextSharp.text.PageSize.LETTER, 10, 10, 42, 35);
byte[] buffer;
HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.BadRequest);
using(MemoryStream stream = new MemoryStream())
using(PdfWriter wri = PdfWriter.GetInstance(doc, mem))
PdfWriter writer = new PdfWriter(stream);
var pdf = new PdfDocument(writer);
var document = new Document(pdf);
document.Add(new Paragraph("Hello World!"));
buffer = stream.ToArray();
var contentLength = buffer.Length;
var statuscode = HttpStatusCode.OK;
response = Request.CreateResponse(statuscode);
response.Content = new StreamContent(new MemoryStream(buffer));
response.Content.Headers.ContentType = new MediaTypeHeaderValue("application/pdf");
response.Content.Headers.ContentLength = contentLength;
ContentDispositionHeaderValue contentDisposition = null;
if (ContentDispositionHeaderValue.TryParse("inline; filename=" + document.Name + ".pdf", out contentDisposition))
response.Content.Headers.ContentDisposition = contentDisposition;
else
var statuscode = HttpStatusCode.NotFound;
var message = String.Format("Unable to find file. file \"0\" may not exist.", docid);
var responseData = responseDataFactory.CreateWithOnlyMetadata(statuscode, message);
response = Request.CreateResponse((HttpStatusCode)responseData.meta.code, responseData);
return response;
【讨论】:
【参考方案2】:我还没有尝试过,只是徒手做的,所以请耐心等待,但我认为您可以了解这里发生了什么。
public HttpResponseMessage CreateLieferschein()
// Create the itext pdf
MemoryStream stream = new MemoryStream();
PdfWriter writer = new PdfWriter(stream);
var pdf = new PdfDocument(writer);
var document = new Document(pdf);
document.Add(new Paragraph("Hello World!"));
document.Close(); // don't forget to close or the doc will be corrupt! ;)
// Load the mem stream into a StreamContent
HttpResponseMessage httpResponseMessage = new HttpResponseMessage(HttpStatusCode.OK)
Content = new StreamContent(stream)
;
// Prep the response with headers, filenames, etc.
httpResponseMessage.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
FileName = "WebApi2GeneratedFile.pdf"
;
httpResponseMessage.Content.Headers.ContentType = new MediaTypeHeaderValue("application/pdf");
ResponseMessageResult responseMessageResult = ResponseMessage(httpResponseMessage);
// Cross your fingers...
return responseMessageResult;
【讨论】:
完美! @Anokrize /highfive :D以上是关于iText 7 从 Asp.Net WebApi 返回 Pdf的主要内容,如果未能解决你的问题,请参考以下文章
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