I'm new in socket. I really need your help.
I have create a socket client in android, and send the server a picture successfully. The next task what I want to do is receiving a JSON file from the server as the reply. However, after I close the outstream, it always tell me, " Socket is closed".
DataOutputStream out = new DataOutputStream(socket.getOutputStream());
//write out the stream
out.close();
InputStream inputStream = socket.getInputStream();
//!!it always throws SocketException, and tell me socket is closed
byte buffer[] = new byte[1024 * 4];
int temp = 0;
// read data from inputStream
while ((temp = inputStream.read(buffer)) != -1) {
System.out.println(new String(buffer, 0, temp));
}
I have tried many ways to solve it.
1.close the outstream lately
DataOutputStream out = new DataOutputStream(socket.getOutputStream());
//write out the stream
InputStream inputStream = socket.getInputStream();
byte buffer[] = new byte[1024 * 4];
int temp = 0;
//!!My client seems to wait for some messages from server.
//However, since I didn't close the outputStream, the server can't stop writing the file from my outputStream.
//As a result, the server can't send back JSON file to me as a reply.
//My server and client all go blocked.
while ((temp = inputStream.read(buffer)) != -1) {
System.out.println(new String(buffer, 0, temp));
}
out.close();
2.connect the socket again
DataOutputStream out = new DataOutputStream(socket.getOutputStream());
//write out the stream
out.close();
socket.connect(sc_add,2000);
//!!it will tell me the socket is already connected this time
InputStream inputStream = socket.getInputStream();
//it always throws SocketException, and tell me socket is closed
byte buffer[] = new byte[1024 * 4];
int temp = 0;
// read data from inputStream
while ((temp = inputStream.read(buffer)) != -1) {
System.out.println(new String(buffer, 0, temp));
}
Thank you for your help.
Related
I am making an android music player. One of the features of the app is that it can connect to another device via sockets and then stream files over that connection. Right now, I have the app connecting to my computer with a ServerSocket. What I want is to load an mp3 on my laptop, get all the bytes from the file and send them over the socket. Then The android app should play the bytes as they are received. I was able to write all the bytes to an mp3 file on my phone, but I am wondering if there is a way to play the bytes as they come in without having to download it. I'm using a MediaPlayer for playback.
Here is my code on the android app for receiving data.
Socket socket = new Socket("ip", port);
out = new DataOutputStream(socket.getOutputStream());
out.write("0\r\n".getBytes());
out.flush();
in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
InputStream inS = socket.getInputStream();
String line;
FileOutputStream newFile = new FileOutputStream(path+"test.mp3");
byte[] by = new byte[BUFFER_SIZE];
int read;
do{
read = inS.read(by,0,BUFFER_SIZE);
newFile.write(by,0,read);
}while(read>0);
And here is my code on the laptop (which is the server side).
Path path = "path to mp3";
byte[] b = Files.readAllBytes(path);
int portNum = 5000;
ServerSocket ss = new ServerSocket(portNum);
while(true)
{
System.out.println("waiting for connection:");
Socket clientSocket = ss.accept();
System.out.println("Got client");
BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
String line = in.readLine();
DataOutputStream out = new DataOutputStream(clientSocket.getOutputStream());
System.out.println(line);
byte[] by = new byte[BUFFER_SIZE];
FileInputStream s = new FileInputStream(path.toString());
int rc = s.read(by);
while(rc>0)
{
System.out.println(rc);
out.write(by,0,rc);
rc = s.read(by,0,BUFFER_SIZE);
}
s.close();
Is there a way I can create a MediaPlayer and make it's data source the byte array being read in and have it play simultaneously?
I am trying to read InputStream after writing output stream to sdcard. I have downloaded file from HttpURLConnection. File is successfuly written to sdcard. But I am trying to read inputstream from same file but contents are not being read properly. On emulator some contents are shown but on actual device contents are not shown. Can you please help what can be the issue? I am posting downloading, writing and reading code.
fileUrl = new URL(filename);
HttpURLConnection connection = (HttpURLConnection)fileUrl.openConnection();
InputStream is = connection.getInputStream();
/**
* Create file with input stream
*/
File downloadFile = new File("/sdcard/", "myFile3.pdf");
downloadFile.createNewFile();
final FileOutputStream outputStream = new FileOutputStream(downloadFile);
int availbleLength = is.available();
byte[] bytes = new byte[availbleLength];
int len1 = 0;
while ((len1 = is.read(bytes)) > 0) {
outputStream.write(bytes, 0, len1);
}
outputStream.flush();
outputStream.close();
File myFile = new File("/sdcard/myFile3.pdf");
InputStream inputStream = new FileInputStream(myFile);
byte[] buffer = new byte[inputStream.available()];
inputStream.read(buffer);
System.out.println("Byte Lenght: " + buffer.length);
inputStream.available() is only an estimate not actual length of the complete input data.
FileInputStream.available()
I need to develop an application to transfer image continuously from android to android which should be received as an video on the client side..and i have two applications which one (server) will send the file through socket connected by wifi and other should the client side should recive the image which is sent...currently am just saving it in one location in the client side...am able to receive the file correctly...but the problem is am not able to send all files correctly all the time...
Means some time the image file will be transfered and some time i ll not be able to receive and when i ll not be able to receive i am getting an exception as
: java.io.UTFDataFormatException: ...and the file is not written and saved on the receiving side...
If am not able to receive images continuously...i can think there is some problem in the code..but am able to transfer it some times..and some time not able to transfer...am not able to figure what the issue is...plz any guidance
the error is:
11-18 10:38:17.351: W/System.err(1001): java.io.UTFDataFormatException: bad second or third byte at 2
11-18 10:38:17.359: W/System.err(1001): at java.nio.charset.ModifiedUtf8.decode(ModifiedUtf8.java:53)
11-18 10:38:17.359: W/System.err(1001): at java.io.DataInputStream.decodeUTF(DataInputStream.java:444)
11-18 10:38:17.359: W/System.err(1001): at java.io.DataInputStream.decodeUTF(DataInputStream.java:438)
11-18 10:38:17.359: W/System.err(1001): at java.io.DataInputStream.readUTF(DataInputStream.java:433)
and the file is not saved when i get this exception..
Many scenarios i have tested by capturing image and saving and sending...and also compressing the image and sending...in these scenarios some very rarely it is going....am not able to figure out it...
Sender code:
File myFile = new File(sdCard+"/image/image.jpg");
byte[] mybytearray = new byte[(int) myFile.length()];
FileInputStream fis = new FileInputStream(myFile);
BufferedInputStream bis = new BufferedInputStream(fis);
//bis.read(mybytearray, 0, mybytearray.length);
DataInputStream dis = new DataInputStream(bis);
dis.readFully(mybytearray, 0, mybytearray.length);
OutputStream os = socket.getOutputStream();
tv.setText("Send file name size to server");
//Sending file name,file size and to the server
DataOutputStream dos = new DataOutputStream(os);
dos.writeUTF(myFile.getName());
dos.writeLong(mybytearray.length);
dos.write(mybytearray, 0, mybytearray.length);
dos.flush();
socket.close();
tv.setText("Socket Close");
tv.setText("Sent");
Receiver Code:
File dir = new File (sdCard.getAbsolutePath() + "/dir1/dir2");
dir.mkdirs();
String fileName = clientData.readUTF();
File file = new File(dir,fileName);
OutputStream output = new FileOutputStream(file);
long size = clientData.readLong();
byte[] buffer = new byte[1024];
while (size > 0 && (bytesRead = clientData.read(buffer, 0, (int)Math.min(buffer.length, size))) != -1)
{
output.write(buffer, 0, bytesRead);
size -= bytesRead;
System.out.println("Writing");
}
// status.setText("Received");
// Closing the FileOutputStream handle
output.close();
s.close();
Thanks and Regards,
Divya.K
I was stuck on this thing i combined few days of my search and reached to this... Try it and see if works for you..
Bitmap myBitmap = null;
try {
File imgFile = new File(imgPath);
if (imgFile.exists()) {
File image = new File(imgPath, "imagename.jpg");
BitmapFactory.Options bmOptions = new BitmapFactory.Options();
myBitmap = BitmapFactory.decodeFile(image.getAbsolutePath(),bmOptions);
//myBitmap = Bitmap.createScaledBitmap(bitmap,parent.getWidth(),parent.getHeight(),true); //uncomment this if you want to scale the image
//imageView.setImageBitmap(bitmap);//to set bitmap to image view
}
Socket sock = new Socket("192.168.1.1", 80);//ip adress and port number
ByteArrayOutputStream bos = new ByteArrayOutputStream();
if (myBitmap != null) {
myBitmap.compress(Bitmap.CompressFormat.PNG, 0 /*ignored for PNG*/, bos);
}
byte[] bitmapdata = bos.toByteArray();
ByteArrayInputStream bs = new ByteArrayInputStream(bitmapdata);
BufferedInputStream bis = new BufferedInputStream(bs);
bis.read(bitmapdata, 0, bitmapdata.length);
OutputStream os = sock.getOutputStream();
System.out.println("Sending...");
os.write(bitmapdata, 0, bitmapdata.length);
os.flush();
sock.close();
} catch (Exception e) {
e.printStackTrace();
}
I'm trying to send bmp image using socket. I have such code on android:
ByteArrayOutputStream stream = new ByteArrayOutputStream();
MainActivity.bmp.compress(Bitmap.CompressFormat.JPEG, 20,
stream);
byte[] byteArray = stream.toByteArray();
OutputStream os = echoSocket.getOutputStream();
os.write(byteArray,0,byteArray.length);
os.flush();
and on PC:
String q = SockIn.readLine();
File file = new File("filename.bmp");
FileWriter fw = new FileWriter(file.getAbsoluteFile());
BufferedWriter bw = new BufferedWriter(fw);
bw.write(q);
in bmp file I only get up to 401 bytes, which of course is corrupt bmp image. what am I doing wrong?
MODIFIED
modified PC side, now the code is:
InputStream in_ = clientSocket.getInputStream();
OutputStream out_ = new FileOutputStream("filename.bmp");
final byte[] buffer = new byte[1024];
int read = -1;
int i = 0;
while ((read = in_.read(buffer)) != -1) {
out_.write(buffer, 0, read);
System.out.println(i);
i++;
}
in_.close();
out_.close();
System.out.println("Done");
It never gets to last line( println("Done") ). when I close android program, it gets to last line and bmp opens succesfully
Your reading logic is completely off. You only use a readLine() once and then write that to file. The data that was written to the socket on the device side was binary. That means that trying to read it as if it were textual (as readLine() does) will return meaningless junk. The reason it's usually 401 bytes long is that readLine() will look for the first newline character combination and return everything up to that as a String. This is not what you want.
What you need is a loop that will read from the socket and write into the file as long as there is data in the socket. A standard copy loop should suffice here.
InputStream in = socket.getInputStream();
OutputStream out = new FileOutputStream(...);
final byte[] buffer = new byte[BUFFER_SIZE];
int read = -1;
while ((read = in.read(buffer)) != -1)
out.write(buffer, 0, read);
in.close();
out.close();
Note that the above code isn't tested but something to that effect should do the trick.
Why are you reading a String if you are sending a byte ?
Try those setp one by one only if the previous did not worked.
1. Read() and don't Readline() what you are writing
If you write a byte, read a byte
Byte obj = SockIn.read();
2. Encode your array before sending
Base64.encodeBase64String(byteArray);
i am trying to download files using getFileStream() in dropbox api but it returns file
information only,please help me to download file data.
here is code..
FileDownload fd = api.getFileStream("dropbox","/public/myfilename.rtf", null);
BufferedReader br = new BufferedReader(new InputStreamReader(fd.is));
BufferedWriter bw = new BufferedWriter(new FileWriter(newfile));
char[] buffer = new char[4096];
int read;
while (true) {
read = br.read(buffer);
if (read <= 0) {
break
}
bw.write(buffer, 0, read);
}
FileDownload fd = api.getFileStream("dropbox",path, null);
File f=new File("/sdcard/test.pdf");
OutputStream out=new FileOutputStream(f);
byte buf[]=new byte[1024];
int len;
while((len=fd.is.read(buf))>0)
out.write(buf,0,len);
out.close();
fd.is.close();
and mention your path like "/public/myfilename"
Here in my code i want to save it as a PDF so
i am creating one pdf and writing data to that.