save UDP socket data into file - file

Question

I have a code to send and receive UDP socket
Send UDP code:
public static void main(String args[]) throws Exception
{
try
{
FileOutputStream fo = new FileOutputStream("OUTFILE.txt");
PrintStream ps = new PrintStream(fo);
DatagramSocket Socket = new DatagramSocket(4555);
byte[] receiveData = new byte[1000000];
DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
while(true)
{
receivePacket.setLength(receiveData.length);
Socket.receive(receivePacket);
String sentence = new String( receivePacket.getData());
System.out.printf("RECEIVED: %s " , new String(receivePacket.getData()));
ps.println(sentence);
ps.println();
ps.close();
fo.close();
}
File file = new File("OUTFILE.txt");
FileInputStream fis = new FileInputStream(file);
byte[] fsize = new byte[(int) file.length()];
int size = fis.read(fsize);
System.out.println("Received Size = " + size);
}
catch (Exception e) {
System.err.println(e);
}
}
}
I want to write the value of each received data packet into file then get the size of the whole file.
In my code I just got the first received value written in the file.
Could you please tell me how can I write the whole received value in the file.

Answer 1

At the end of the first loop, you're closing the streams so additional lines can not be written. You need to move the ps.close(); and fs.close() calls to be outside of the loop. In addition, you have an indefinite loop which guarantees that the code reading from the file can not be called--you need to have some mechanism to determine when to stop looping.