我正在尝试使用Android将视频文件发布到AWS，使用HttpUrlConnection。我按照http://docs.aws.amazon.com/AmazonS3/latest/API/sigv4-post-example.html和http://docs.aws.amazon.com/AmazonS3/latest/API/RESTObjectPOST.html
的说明格式化标题和正文我似乎能够将请求正文和文件数据写入连接输出流，从某种意义上说它可以让我完成写入块（当我之前在我的标题中有一些错误时，这没有发生）。但是，当我检查文件是否在AWS上时，它不是。
响应流似乎是找出原因的最佳方法。但是，当我尝试在连接上打开并输入流以获取响应时，这会导致“管道错误。”
所以，这是代码：
URL url = new URL(action);
HttpURLConnection conn = null;
conn = (HttpURLConnection) url.openConnection();
conn.setUseCaches(false);
conn.setDoOutput(true);
conn.setRequestMethod("POST");
conn.setRequestProperty("Host",bucket);
conn.setRequestProperty("User-Agent","Java/1.7.0_60");
conn.setRequestProperty("Accept","text/html,application/xhtml+xml, application/xml,application/json;q=0.9,*/*;q=0.8");
conn.setRequestProperty("Acccept-Language", "en-US,en;q=0.5");
conn.setRequestProperty("Accept-Encoding","gzip, deflate");
conn.setRequestProperty("Accept-Charset","UTF-8");
conn.setRequestProperty("Connection", "keep-alive");
conn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);
File fileObj = new File(file);
String closingString = crlf+twohyphens + boundary + twohyphens + crlf;
//get content length and set
int totalLength = body.getBytes().length + (int)fileObj.length() + closingString.getBytes().length;
conn.setRequestProperty("Content-Length",Integer.toString(totalLength));
//set body content fields
DataOutputStream request = new DataOutputStream(conn.getOutputStream());
request.writeBytes(body);
//get mp4 data and write to request:
InputStream input = new BufferedInputStream(new FileInputStream(file));
int data = input.read();
while(data != -1) {
//TODO loading animation
request.write(data);
data = input.read();
}
input.close();
Log.d("Writing","of file to output stream complete.");
request.writeBytes(closingString);
request.flush();
request.close();
Log.d("Writing","closing string to output stream complete. Closed stream");
//Response
/******** it seems to break on the following line: *************/
InputStream responseStream = new BufferedInputStream(conn.getInputStream());
BufferedReader responseStreamReader = new BufferedReader(new InputStreamReader(responseStream));
String line = "";
StringBuilder stringBuilder = new StringBuilder();
while ((line = responseStreamReader.readLine()) != null)
{
stringBuilder.append(line).append("\n");
}
responseStreamReader.close();
String responseString = stringBuilder.toString();
Log.d("server response",responseString);
Response response = new Response(0,"test");
conn.disconnect();
注意：“body”字符串包含帖子正文内容中的所有内容（即所需的表单字段，格式如示例链接中所示），但实际文件内容除外，它必须最后一次。
以下是日志：
D/Writing: of file to output stream complete
D/Writing: closing string to output stream complete. Closed stream
W/System.err﹕ java.net.SocketException: sendto failed: EPIPE (Broken pipe)
W/System.err﹕ at libcore.io.IoBridge.maybeThrowAfterSendto(IoBridge.java:546)
W/System.err﹕ at libcore.io.IoBridge.sendto(IoBridge.java:515)
W/System.err﹕ at java.net.PlainSocketImpl.write(PlainSocketImpl.java:504)
W/System.err﹕ at java.net.PlainSocketImpl.access$100(PlainSocketImpl.java:37)
W/System.err﹕ at java.net.PlainSocketImpl$PlainSocketOutputStream.write(PlainSocketImpl.java:266)
W/System.err﹕ at com.android.okio.Okio$1.write(Okio.java:73)
W/System.err﹕ at com.android.okio.RealBufferedSink.emitCompleteSegments(RealBufferedSink.java:116)
W/System.err﹕ at com.android.okio.RealBufferedSink.write(RealBufferedSink.java:44)
W/System.err﹕ at com.android.okhttp.internal.http.RetryableSink.writeToSocket(RetryableSink.java:77)
W/System.err﹕ at com.android.okhttp.internal.http.HttpConnection.writeRequestBody(HttpConnection.java:259)
W/System.err﹕ at com.android.okhttp.internal.http.HttpTransport.writeRequestBody(HttpTransport.java:84)
W/System.err﹕ at com.android.okhttp.internal.http.HttpEngine.readResponse(HttpEngine.java:771)
W/System.err﹕ at com.android.okhttp.internal.http.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:379)
W/System.err﹕ at com.android.okhttp.internal.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:323)
W/System.err﹕ at com.android.okhttp.internal.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:190)
W/System.err﹕ at android.synq.fm.connectivity.WebService.post(WebService.java:244)
W/System.err﹕ at android.synq.fm.connectivity.AwsPoster.doInBackground(AwsPoster.java:36)
W/System.err﹕ at android.synq.fm.connectivity.AwsPoster.doInBackground(AwsPoster.java:14)
W/System.err﹕ at android.os.AsyncTask$2.call(AsyncTask.java:288)
W/System.err﹕ at java.util.concurrent.FutureTask.run(FutureTask.java:237)
W/System.err﹕ at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
W/System.err﹕ at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
W/System.err﹕ at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
W/System.err﹕ at java.lang.Thread.run(Thread.java:818)
W/System.err﹕ Caused by: android.system.ErrnoException: sendto failed: EPIPE (Broken pipe)
W/System.err﹕ at libcore.io.Posix.sendtoBytes(Native Method)
W/System.err﹕ at libcore.io.Posix.sendto(Posix.java:176)
W/System.err﹕ at libcore.io.BlockGuardOs.sendto(BlockGuardOs.java:278)
W/System.err﹕ at libcore.io.IoBridge.sendto(IoBridge.java:513)
请注意日志行： W / System.err：在android.synq.fm.connectivity.WebService.post（WebService.java:244）
对应于代码中的以下行： InputStream responseStream = new BufferedInputStream（conn.getInputStream（））;
所以，我的问题是双重的。为什么这似乎不能成功上传文件，即使它可以写入连接输出流？为什么我试图获得请求响应“打破管道”？是否有一种特殊的方式来获取AWS的POST响应，这些响应未包含在文档中或我错过了什么？ （请注意，这是我第一次使用POST请求和AWS。）
提前致谢。