Interrupting socket connection

Question

I have a socket program which is sending text data via PrintWriter(out.write(String str)), on the other side BufferedReader(in.readLine()) is receiving this.

I want to secure my program with some kind 'timeout' if one of clients breaks the connection, but I tested it and during work, when client will be turned off, server is still sending data and there is no interruption nor socket closing.

Same for client, I want to break connection and display info for example "server is not working". How I can handle this ?

// Server
out = new PrintWriter( sock.getOutputStream());
while( true ) {
   this.out.write("Hello");
   this.out.flush();
}

// Client
in = new BufferedReader( new InputStreamReader( sock.getInputStream()));
while (true) {
   in.readLine();
}

Set a read timeout on the socket.

user207421
– user207421

2021-03-30 22:57:38 +00:00
Commented Mar 30, 2021 at 22:57 — user207421
– user207421, Commented Mar 30, 2021 at 22:57

Evgeniy Dorofeev · Accepted Answer · 2012-12-01 19:20:44Z

2

I think your problem is PrintWriter. See its documentation:

Methods in this class never throw I/O exceptions, although some of its constructors may. The client may inquire as to whether any errors have occurred by invoking checkError().

use BufferedWriter instead.

Note that java.util.Scanner has the same issue (in case you are using it on the server side)

edited Dec 1, 2012 at 19:20

answered Dec 1, 2012 at 18:08

Evgeniy Dorofeev

137k31 gold badges209 silver badges288 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

ashur · Accepted Answer · 2012-12-02 17:30:25Z

1

I just checked and PrintWriter.checkError() method helped me with my issue. When client broke connection, method returned true. As says description: Flushes the stream if it's not closed and checks its error state.

// Server
this.out = new PrintWriter(sock.getOutputStream());
while (true) {
   this.out.write("Hello");
   this.out.flush();
   if(this.out.checkError()){
      //...
   }
}

edited Dec 2, 2012 at 17:30

answered Dec 1, 2012 at 18:27

ashur

4,37514 gold badges57 silver badges86 bronze badges

Collectives™ on Stack Overflow

Interrupting socket connection

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related