Java Socket reading response from other application


Java Socket reading response from other application



I'm currently making a connection from a software to an application using java socket.
The code is more or less like this


import java.io.*;
import java.net.*;
import java.util.Scanner;

public class Input {
public static void main(String args) {

try{

Socket s=new Socket("ok",10003);
PrintWriter printWriter = new PrintWriter(s.getOutputStream());
Scanner scanner = new Scanner( System.in );
BufferedReader inserver = new BufferedReader(new
InputStreamReader(s.getInputStream()));

String str = scanner.nextLine();
String hisscanner = "u0002"+str+"u0003";


printWriter.write(hisscanner);
s.shutdownInput();

String response = inserver.readLine();
System.out.println("FROM SERVER: " + response);
printWriter.close();

s.close();
scanner.close();

}catch (UnknownHostException ex) {
System.out.println("Could not connect to the server [Unknown exception]");
} catch (IOException ex) {
System.out.println(ex.getMessage());
}
}}



So we send a string to the application, and the application should reply back a string. It has successfully sent the string to the application, and that application is also showing a reply correctly.



Example of the application log:
https://ibb.co/ikLxNJ



The problem is, the reply won't show up in the console of software I made.



The console :
https://ibb.co/e5fghJ



The software I run always returns with NULL, can someone help point out whats wrong and help me corrects it?





Surely you should not run s.shutdownInput(); to close the input before you try to read from the socket ?
– nos
Jun 29 at 9:10



s.shutdownInput();





i changed to s.shutdownOutput(); and it wont send the string to the application. if i deleted it, the software doesn't show anything and won't stop running
– M.Fauzan
2 days ago






You'd probably need a printWriter.flush() call before you run shutdownOutput, but before you run printWriter.write(hisscanner);
– nos
2 days ago



printWriter.flush()


printWriter.write(hisscanner);





all right, i wrote it like this printWriter.flush(); s.shutdownOutput(); printWriter.write(hisscanner); it still doesn't send the string to the application
– M.Fauzan
2 days ago





Well, now you are flushing before you write anything , and you are even shutting down the output before you write anything - how can that work ? printWriter.write(hisscanner); printWriter.flush(); s.shutdownOutput(); seems like the proper sequence.
– nos
2 days ago









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