So I am making a basic chat application. This is a snippet of the code from the client. Here I am sending information to the server and then getting a reply.
However, sometimes the server will send messages to the client without requiring the client to send information to the server first. How do I implement this?
while (true){
String sentence;
BufferedReader inFromUser =
new BufferedReader(new InputStreamReader(System.in));
sentence = inFromUser.readLine();
// send to server
DataOutputStream outToServer = new DataOutputStream(clientSocket.getOutputStream());
outToServer.writeBytes("\n");
// create read stream and receive from server
BufferedReader FromServer = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
System.out.println(FromServer.readLine());
}
For example, the server might send random bits of information to me at random intervals. But I can only receive them when I send the server something first. But if I implement something likes this instead (shown below), I will no longer be able to send information to the server and can only act as a receiver. But I want to be able to send information and receive information when necessary without having to send something first.
while (true){
// receive from server only
BufferedReader FromServer = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
System.out.println(FromServer.readLine());
}
What I changed in reply to first comment. I followed your code so this is what I did. However, i still can't seem to receive messages spontaneously ie i still need to press enter or type in an input to receive any server information sent at random times:
BufferedReader FromServer = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
while (true) {
// Check if there's anything to receive
while (FromServer.ready()) {
// receive from server
System.out.println(FromServer.readLine());
}
String sentence;
BufferedReader inFromUser =
new BufferedReader(new InputStreamReader(System.in));
sentence = inFromUser.readLine();
// write to server
DataOutputStream outToServer = new DataOutputStream(clientSocket.getOutputStream());
outToServer.writeBytes(sentence + '\n');
// Send data to the server here if required.
}
Change it to something like this:-
BufferedReader FromServer =
new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
DataOutputStream outToServer = new DataOutputStream(clientSocket.getOutputStream());
BufferedReader inFromUser =
new BufferedReader(new InputStreamReader(System.in));
while (true) {
// Check if there's anything to receive
while (FromServer.ready()) {
// receive from server
System.out.println(FromServer.readLine());
}
if (inFromUser.ready()) {
int ch = inFromUser.read();
// write to server
outToServer.writeChar(ch);
}
}
Now the client will read anything that's there to be read, and can send data if/when required.
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