如何将图片上传到ServiceStack服务？ [英] How do I upload an image to a ServiceStack service?

问题描述

我有一个图像的路径，并使用下面的代码发送给我的服务器;
$ b

I have the path of an image, and use the following code to send it to my server;

HttpWebRequest client = (HttpWebRequest)WebRequest.Create("http://212.175.132.168/service/api/upload/cab.jpg");
client.Method = WebRequestMethods.Http.Post; 

// the following 4 rows enable streaming 
client.AllowWriteStreamBuffering = false;
client.SendChunked = true;
client.ContentType = "multipart/form-data;";
client.Timeout = int.MaxValue;

using (FileStream fileStream = System.IO.File.OpenRead (filePath)) {
    fileStream.Copy (client.GetRequestStream ());
}

var response = new StreamReader (client.GetResponse ().GetResponseStream ()).ReadToEnd ();

但是代码不起作用，图像没有附加。我在这里做错了什么？

But the code doesn't work, image isn't attached. What I am I doing wrong here?

推荐答案

HttpWebRequest + multipart / form-data HttpWebRequest 和 multipart / form-data 来限制



$ b $> / code>要求您指定内容的边界。如果你不明白的话，这是相当多的工作，很容易造成上传失败。然而这里的这个问题涵盖了如何去做。

HttpWebRequest + multipart/form-data needs boundaries:

By using HttpWebRequest with multipart/form-data requires that you specify the boundaries of your content. Which is rather a lot of work and can easily cause corrupt uploads if you don't understand it. However this question here covers how to do it.

但是，当您使用ServiceStack后端时，最好的方法是使用 ServiceStack.Client PCL library 在你的Android应用程序中，它提供了易于使用的 JsonServiceClient 。 查看这个例子，了解一个带有ServiceStack演示的完整Android。

But as you are using a ServiceStack backend, then the best approach is to use the ServiceStack.Client PCL library in your Android application, which provides the easy to use JsonServiceClient. See this example for a full Android with ServiceStack demonstration.

所以给一个简单的上传服务（在你的服务器端）：
$ b

So given a simple Upload Service (on your server side):

[Route("/upload","POST")]
public class UploadFileRequest
{
    // Example of other properties you can send with the request
    public string[] Tags { get; set; }
}

class MyFileService : Service
{
    public bool Post(UploadFileRequest request)
    {
        // Check a file has been attached
        if(Request.Files == null || Request.Files.Length == 0)
            throw new HttpError(400, "Bad Request", "No file has been uploaded");

        // Save the file
        Request.Files[0].SaveTo(Request.Files[0].FileName);

        // Maybe store the tags (or any other data in the request)
        // request.Tags

        return true;
    }
}

/ code>在你的Android应用程序，那么你只需要这样做：
$ b

Then with the JsonServiceClient in your Android app, then your simply need to do this:

var filename = "cab.jpg"; // The path of the file to upload
var client = new JsonServiceClient("http://212.175.132.168/service/api/");
using(var fileStream = File.OpenRead(filename))
{
    client.PostFileWithRequest<bool>(fileStream, "cab.jpg", new UploadFileRequest { Tags = new[] { "Cab", "Taxis", "NewYork", "Yellow" }});
}

我希望这有助于。

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