Java DataOutputStream not sending data to sockets

Question

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• Java Socket why server can not reply client 4 answers

I have a java application which uses sockets to communicate with another computer. I´m using a DataOutputStream to write data to the server and a BufferedReader to read from server. Before reaching the problem, I can succesfully send and read responses several times from the server.

However there´s a part where I send two, writeBytes() functions one after the other. At this point, my server just reads the first string and stays stuck on readline() even though I´ve send another string on the second writeBytes().

Here´s my snippet:

InetAddress ipServer = InetAddress.getByName(direcciones.get(0).host);
Socket clientSocket = new Socket(ipServer,25);
DataOutputStream outToServer = new DataOutputStream(clientSocket.getOutputStream()); 
BufferedReader inFromServer = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
String response = inFromServer.readLine();

Here is where I´m getting just the email.data String and not the "." that comes afterwards.

outToServer.writeBytes(email.data+"\r\n");
outToServer.writeBytes("."+ "\r\n");
response = inFromServer.readLine();   

This is how the data is read on the server:

while(mailReady == false){
    String linea;
    linea = input.readLine();
    System.out.println("INPUT Paso5: "+linea);
    email.data += linea+"\n";

    if(linea.equals(".")){
        mailReady = true;
        ...

Where input is a BufferedReader.

Can anyone tell me what is happening here?

Answer 1

You are reading lines but you aren't writing lines. Instead of DataOutoutStream.writeBytes() you should be using BufferedWriter.write() followed by BufferedWriter.newline().