流从Android文件到.NET http服务 [英] Streaming file from android to .net http service

问题描述

我试着去流从Android的文件到一个asp.net服务：

Im trying to stream a file from android to an asp.net service:

private static void writeFile(File file, DataOutputStream out)
        throws IOException {

    BufferedInputStream bufferedFileIs = null;
    Base64OutputStream base64out = null;
    try {
        out.writeBytes("fileBase64=");
        base64out = new Base64OutputStream(out, Base64.DEFAULT);

        FileInputStream fileIs = new FileInputStream(file);
        bufferedFileIs = new BufferedInputStream(fileIs);
        int nextByte;
        while ((nextByte = bufferedFileIs.read()) != -1) {
            base64out.write(nextByte);
        }
    } finally {
        if (bufferedFileIs != null) {   
            bufferedFileIs.close();
        }
        if(base64out != null)
            base64out.flush();

    }

}

和接受它像这样

String base64 = Request.Form["fileBase64"];

byte[] bytes = System.Convert.FromBase64String(base64);

我使用的HttpURLConnection，我没有得到任何异常，但接收的文件（影像）已损坏，在这个过程中。 我试着ALOT不同的流包装对，但没有运气。任何人有这样的经历？ 我流等形式条目在同一个连接到这些未损坏，例如：

I use an HttpURLConnection and I dont get any exceptions but the received file(image) is corrupted in the process. I tried ALOT of different stream wrapper pairs, but no luck. Anyone have experience in this? I stream other form entries in the same connection and these arrive un-corrupted, for example

&UserID=12345

Gratefull对您有所帮助。

Gratefull for your help.

干杯！

推荐答案

解决了这个问题：

prepare文件：

Prepare the file:

File file = new File(LocalFilePath);

FileEntity fileentity = new FileEntity(file, "UTF-8");
HttpUtilities.postRequest(WebServiceURL, fileentity);

发布请求：

public static String postRequest(String url, HttpEntity aEntity)
        throws IOException {

    InputStream is = null;
    try {

        HttpClient client = new DefaultHttpClient();

        HttpPost httppost = new HttpPost(url);

        httppost.setEntity(aEntity);

        HttpResponse response = client.execute(httppost);
        HttpEntity responseEntity = response.getEntity();

        is = responseEntity.getContent();

    } catch (Exception e) {
    }

    return getResponse(is);
}

在这个网络服务器抱怨：

after this the webserver complained:

HttpException (0x80004005): Maximum request length exceeded

最大请求长度默认为4MB，所以我设置这个在web.config中：

max request-length defaults to 4mb so i set this in web.config:

<system.web>
    <httpRuntime maxRequestLength="1048576"/>
</system.web

这使得文件高达1GB（！）。

Which allows files up to 1GB(!).

编辑：

忘记服务器code：

var str = Request.InputStream;
strLen = Convert.ToInt32(str.Length);
byte[] strArr = new byte[strLen];
strRead = str.Read(strArr, 0, strLen);

这篇关于流从Android文件到.NET http服务的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！