(This is for a signed applet and I have decided against HTTPClient to keep my jar very small)
I am using HttpURLConnection to successfully upload a file from the user to a server using multi-part form post.
The problem is that HttpURLConnection is caching the data -- before sending it. So when I am reading from the file and writing to Outputstream, it is merely buffering the data -- and therefore my progress bar, that shows the upload status , is completely wrong. Howevere please note that the form post code works and the file does get uploaded correctly with return code of 200.
So how do I ensure that HttpURLConnection does not cache the data that I am sending to the server ?
Here is my source:
public UploadResponse send(String formPostUrlStr,String fileFieldName,File targetFile, Map<String, String> valuesMap, UploadStatusListener uploadStatusListener) throws Exception{
String sendStr=getBoundaryMessage(Boundary, valuesMap, fileFieldName, targetFile.getName(), valuesMap.get("content-type") );//"image/png") ;
System.out.println(" multi-part start \n "+ sendStr+ " multi-part end \n");
String lenstr=Long.toString((long)(sendStr.length()*2)+ targetFile.length());
System.out.println("Content-Length"+ lenstr);
//Content-Length
URL url= new URL(formPostUrlStr);
long startTime= System.currentTimeMillis();
HttpURLConnection s3Connection = (HttpURLConnection) url.openConnection();
System.out.println("opened url to "+ formPostUrlStr +", connection ok ..");
s3Connection.setRequestProperty("Content-Type", "multipart/form-data; boundary="
+ Boundary);
s3Connection.setRequestProperty("content-length", lenstr);
s3Connection.setDoOutput(true);
s3Connection.setDoInput(true);
s3Connection.setUseCaches(false);
s3Connection.setInstanceFollowRedirects(true);
s3Connection.setAllowUserInteraction(true);
s3Connection.setRequestProperty("User-Agent", "Mozilla/4.5");
if (uploadStatusListener != null) {
uploadStatusListener.statusUpdate(targetFile.length(), 0);
}
String debugStr= s3Connection.toString();
System.out.println("conmnection "+ debugStr);
DataOutputStream httpOut = new DataOutputStream(s3Connection.getOutputStream());
System.out.println("opened DataOutputStream ok ..");
httpOut.write(sendStr.getBytes());
//httpOut.flush();
System.out.println("httpOut.flush 1 ok ..");
FileInputStream uploadFileReader = new FileInputStream(targetFile);
long totalBytes = uploadFileReader.available();
if (uploadStatusListener != null) {
uploadStatusListener.statusUpdate(totalBytes, 0);
}
System.out.println(" uploading file with size "+ uploadFileReader.available());
int bufSize = 102400;
long availableBytesToRead;
long totalSent = 0;
while ((availableBytesToRead = uploadFileReader.available()) > 0) {
byte[] bufferBytesRead;
bufferBytesRead = availableBytesToRead >= bufSize ? new byte[bufSize]
: new byte[(int)availableBytesToRead];
int count = uploadFileReader.read(bufferBytesRead);
try{
httpOut.write(bufferBytesRead);
totalSent += ((long) count);
System.out.println(" wrote bytes = "+count+ ", total sent = "+ totalSent +", pendingSize"+ (availableBytesToRead-count) );
}
catch(IOException ioe){
System.out.println(" io exceotion e"+ ioe.getMessage());
throw ioe;
}
//httpOut.flush();
if (uploadStatusListener != null) {
uploadStatusListener.statusUpdate(totalBytes, totalSent);
}
}
// FILE DATA END
httpOut.write(("--" + Boundary + "--\r\n").getBytes());
// form end
httpOut.write(("--" + Boundary + "--\r\n").getBytes());
httpOut.flush();
httpOut.close();
long endTime= System.currentTimeMillis();
System.out.println("Completed Writing Data to S3 Connection in "+ (endTime-startTime)+"ms.,now waiting for rsponse code ");
int code=s3Connection.getResponseCode();
long endTime2= System.currentTimeMillis();
System.out.println("Completed Sendind Data to S3 in "+ (endTime2-startTime)+ "ms., rsponse code time "+ (endTime2-endTime)+"ms. ");
UploadResponse uploadResponse = new UploadResponse();
uploadResponse.setCode(code);
System.out.println(" response code : " + code);
StringBuilder response = new StringBuilder();
byte[] respBuffer = new byte[4096];
if (code > 300) {
if (code == 404) {
throw new Exception("Error 404");
}
BufferedReader err = new BufferedReader(
new InputStreamReader(s3Connection.getErrorStream()));
String ret;
StringBuffer buff = new StringBuffer();
while ((ret = err.readLine()) != null) {
buff.append(ret);
}
uploadResponse.setMessage(buff.toString());
System.out.println(" error :"+ buff.toString());
err.close();
} else {
BufferedReader inp = new BufferedReader(
new InputStreamReader(s3Connection.getInputStream()));
StringBuffer buff = new StringBuffer();
String ret;
while ((ret = inp.readLine()) != null) {
buff.append(ret);
}
inp.close();
uploadResponse.setMessage(buff.toString());
if(buff.toString().contains("fail"))
throw new Exception("Upload failed");
}
System.out.println(response.toString());
return uploadResponse;
}
}
