java - javame - download and save mp3 file on -

java - javame - download and save mp3 file on -

i have javame project , im trying create method download , save mp3 file phone. method shown below, unfortunately keeps throwing exception of java.lang.illegalargument exception.

public void download_keytest() { fileconnection file = null; outputstream outstream = null; string resumejson = mpreferences.get("resume"); jsonobject resumeobject; seek { resumeobject = new jsonobject(resumejson); string key=resumeobject.get("code").tostring(); string inputstr=gettextfield12().getstring(); if (inputstr.equals(key)) { enumeration roots = filesystemregistry.listroots(); string currentroot = null; while (roots.hasmoreelements()) { currentroot = (string) roots.nextelement(); system.out.println(currentroot); } httpconnection hc = null; datainputstream in = null; seek { string url = d_url+resumeobject.getjsonobject("sobject").get("loc").tostring(); string sname = urlencode(resumeobject.getjsonobject("sobject").getstring("name").tostring()); hc = (httpconnection)connector.open(url); int length = (int)hc.getlength(); byte[] info = null; if (length != -1) { switchdisplayable(null,getwaitscreen1()); info = new byte[length]; in = new datainputstream(hc.openinputstream()); in.readfully(data); } else { // if content length not given, read in chunks. switchdisplayable(null,getwaitscreen1()); int chunksize = 512; int index = 0; int readlength = 0; in = new datainputstream(hc.openinputstream()); info = new byte[chunksize]; { if (data.length < index + chunksize) { byte[] newdata = new byte[index + chunksize]; system.arraycopy(data, 0, newdata, 0, data.length); info = newdata; } readlength = in.read(data, index, chunksize); index += readlength; } while (readlength == chunksize); length = index; } getwaitscreen1().settext("download complete"); seek { // path photos folder. string dirmusic = system.getproperty("fileconn.dir.memorycard.music"); if(dirmusic == null) { dirmusic=currentroot; //throw new exception("unable music folder name"); } string filename = dirmusic + sname +".mp3"; // open file file = (fileconnection)connector.open(filename, connector.read_write); // if there no file create if(file.exists() == false) { file.create(); } // write info received photographic camera while making snapshot file outstream = file.openoutputstream(); outstream.write(data); system.out.println(file.availablesize()); //file.sethidden(false); getwaitscreen1().settext("song saved music folder."); } catch(ioexception ioe) { alert alertx = new alert("io error", ioe.tostring(), null, alerttype.error); alertx.settimeout(alert.forever); switchdisplayable(alertx,getdownloadverifykeyform()); } catch(exception exc) { alert alertx = new alert("error", exc.tostring()+exc.getmessage(), null, alerttype.error); exc.printstacktrace(); alertx.settimeout(alert.forever); switchdisplayable(alertx,getdownloadverifykeyform()); } { // seek close file seek { if(outstream != null) { outstream.close(); } if(file != null) { file.close(); } } catch(exception exc) { // nil exc.printstacktrace(); } } } grab (exception ex) { ex.printstacktrace(); } } } grab (exception ex) { ex.printstacktrace(); } }

here error get

java.lang.illegalargumentexception @ javax.microedition.io.connector.getprotocolinstance(), bci=28 @ javax.microedition.io.connector.open(), bci=24 @ javax.microedition.io.connector.open(), bci=3 - spinapp.spinapp.download_keytest(spinapp.java:703)

line 703 in code

hc = (httpconnection)connector.open(url);

connector.open(string) throw illegalargumentexception if url invalid, need see exact url you're passing in.

it's little bit hard tell url is, because of way stack overflow comment formatting works. future reference, if want paste in exact url comment, please format code single tick marks around it. so, it's little hard tell if url variable includes protocol prefix or not.

but, total url should

http://127.0.0.1/relief/api/uploads/p17gnmso5duql0lnhevja15td5.mp3

obviously, when testing urls, it's also thought paste url desktop browser, , create sure works there, too. url (host=127.0.0.1) says you're running server on same machine simulator.

(this brings point ... phone in question, 127.0.0.1 server address going work if you're running in simulator)

edit: after looking on comments again, i'm wondering if exception isn't occurring on line instead:

file = (fileconnection)connector.open(filename, connector.read_write);

if filename equal root1/bogolako.mp3, are missing protocol call. should prefix filename "file:///", assuming "/root1/" valid absolute path on simulator.

see here j2me file connection example

java java-me