I'm trying to build a small Java app for connecting to an application called CampFire and am running into trouble trying to upload files to the system. The Java code I'm using to upload a file is as follows:
public static String postFile(String requestUri, File f)
{
debug("Running postFile.");
logIn();
debug("Sending File: " + f.getAbsolutePath() + " to " + campFireURL + requestUri);
URL url;
URLConnection conn;
String linebreak = "\r\n";
String boundary = "**********xxx**********";
String twoHyphens = "--";
String result = "";
String request = twoHyphens + boundary + linebreak +
"Content-Disposition: form-data; name=\"upload\"; filename=\"" + f.getName() + "\"" + linebreak +
linebreak +
"";
debug("Request: " + request);
try
{
FileInputStream in = new FileInputStream(f);
auth.resetTries();
Authenticator.setDefault(auth);
// Send data
url = new URL(campFireURL + requestUri);
conn = url.openConnection();
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setUseCaches(false);
conn.setRequestProperty("Connection", "Keep-Alive");
conn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + boundary);
DataOutputStream wr = new DataOutputStream(conn.getOutputStream());
wr.writeBytes(request);
int i;
while((i = in.read()) != -1)
{
wr.write(i);
}
wr.writeBytes(linebreak + twoHyphens + boundary + twoHyphens + linebreak);
wr.flush();
wr.close();
in.close();
result = readFromConnection(conn);
}
catch (Exception e)
{
debug(e);
JOptionPane.showMessageDialog(null, "Error running postData: " + e.getMessage(), "HTTP POST Error", JOptionPane.ERROR_MESSAGE);
die();
}
return(result);
}
When I run this with a real file though, I get the following errors...
Running postFile.
Sending File: /home/myuser/Desktop/blah.png to https://blah.campfirenow.com/room/blah/uploads.xml
Request: --**********xxx**********
Content-Disposition: form-data; name="upload"; filename="blah.png"
Server returned HTTP response code: 422 for URL: blah blah
java.io.IOException: Server returned HTTP response code: 422 for URL: blah blah
Any idea's what I'm doing wrong here? I'm fairly new at Java and am wondering if maybe I missed something obvious?