Issues related to socket channel for stream-oriented connecting sockets in Java
A socket channel represents a "selectable channel" for stream-oriented connecting sockets in Java. It is part of the Java NIO library.
Questions tagged [socketchannel]
249 questions
2
votes
3 answers
How to get data from TCP socket into a ByteBuffer
I need to get incoming data from a socket into a ByteBuffer and I do not know how to do it. I am new to this field and therefore not sure of the best way to start. I found the following but that is not what I want as it gets the data in line but I…
user1372020
- 91
- 2
- 2
- 12
2
votes
5 answers
Java NIO. SocketChannel.read method all time return 0. Why?
I try understand how works java NIO. In particular, how works SocketChannel.
I wrote code below:
import java.io.*;
import java.net.*;
import java.nio.*;
import java.nio.channels.*;
public class Test {
public static void main(String[] args)…
user471011
- 7,104
- 17
- 69
- 97
2
votes
1 answer
java.nio.channels.IllegalBlockingModeException while reading content from client through a channel
Am very new to NIO am building a chat application i got connection in all the client but while reading content from client i got java.nio.channels.IllegalBlockingModeException. please help me here is the code where the exception occures. while…
Amith
- 1,907
- 5
- 29
- 48
2
votes
3 answers
PubNub best practice: How to manage private rooms?
I'm learning pubnub and I read their documentation but I just can't find how to manage a multi room chat box.
By default, a channel can be listened by anyone.
Subscribing to it and publishing on it is easy.
What I want is to have a main public room…
Baylock
- 1,246
- 4
- 25
- 49
1
vote
1 answer
Android: Find peers on Wifi Network
I'm trying to figure out how to search for other devices logged into a wifi network that are hosting the application on a specific port.
How can I detect the presence of these other devices without knowing their address or even necessarily the port…
bgroenks
- 1,859
- 5
- 34
- 63
1
vote
1 answer
Sending multiple messages through only one SocketChannel
After reading this tutorial: http://rox-xmlrpc.sourceforge.net/niotut/ (it's about writing non-blocking server and client, and I read NIO part, skiped SSL part), now I'm trying to rewrite my own client, but I'm stuck in a problem when trying to edit…
Leo
- 1,433
- 23
- 40
1
vote
2 answers
java nio socketChannel read always return same data
In client side, read code:
byte[] bytes = new byte[50]; //TODO should reuse buffer, for test only
ByteBuffer dst = ByteBuffer.wrap(bytes);
int ret = 0;
int readBytes = 0;
boolean fail = false;
try {
while ((ret = socketChannel.read(dst)) > 0) {
…
Eric Yu
- 11
- 1
- 4
1
vote
2 answers
SocketChannel.read() blocks indefinitely
I'm having a hard time figuring this one out. I have the following code:
if (selector.select(1000) <= 0) {
return;
}
Set selectionKeys = selector.selectedKeys();
for (SelectionKey key : selectionKeys) {
…
cdecker
- 4,515
- 8
- 46
- 75
1
vote
2 answers
ReadableByteChannel hangs on read(bytebuffer)
Im working on Instant messenger using java 1.6. IM uses multithreading - main thread, receiving, and ping. For tcp/ip communication I used SocketChannel. And it seems there is a problem with receiving bigger packages from server. Server instead of…
sammael-s1
- 11
- 3
1
vote
1 answer
how to create multiple UDP Datagram channels/streams on same local/src address
I have to receive data from diff clients on same port of server.
I want to create separate channels for each client for this purpose and receive data on each of them.
I am exploring all the options available to design this.
Option 1 : Listen on a…
Onki
- 1,879
- 6
- 38
- 58
1
vote
1 answer
With a non-blocking SocketChannel, is the affiliated Socket blocking?
I'm developing an Android app, trying to do a non-blocking write from one thread on a socket, while doing a blocking read on another thread. I'm looking through SocketChannel docs and trying to figure out what exactly configureBlocking does.…
lacker
- 5,470
- 6
- 36
- 38
1
vote
1 answer
How to read from & write to ByteBuffer correctly?
I can't manage to get all data from byteBuffer.
I have to methods as follows:
Client side:
public String sendMessage(String msg) {
buffer = ByteBuffer.wrap(msg.getBytes());
String response = null;
try {
…
Alxa
- 79
- 1
- 2
- 11
1
vote
1 answer
How does Java NIO constructs - socketchannel and socketserverchannel work internally?
I have some specific questions related to how socketchannel and socketserverchannel work:-
When a ServerSocketChannel accepts a connection( please refer to code below), my understanding is it somehow moves the client to a new randomly selected…
user3740951
- 1,109
- 2
- 20
- 39
1
vote
0 answers
Why can my Server not receive any data from a readable socketChannel?
I'm trying to build a server client application.
The clients can connect to the server and are correctly registered.
When a client writes data to the channel which connects client and server, the server cannot read any data.
The selectorKey…
Knolle
- 11
- 2
1
vote
1 answer
Java; NIO - reading large amounts of data from a SocketChannel
I am writing a very simple networking library that I can use for my other projects in the future. Right now, I am having trouble handling reading operations. I have a class that is responsible for handling events from SocketChannels, and it also…
Martin Tuskevicius
- 2,590
- 4
- 29
- 46