Using the Sun Java VM 1.5 or 1.6 on Windows, I connect a non-blocking socket. I then fill a ByteBuffer with a message to output, and attempt to write() to ... |
Using SocketChannel sc =(SocketChannel)key.channel();, we can fetch data from port into buffer.
In order to receive the data continuously from port without the loss of data, how the code should be ... |
Ideally, I only need a simple SSLSocketChannel: I already have a component that reads and writes message over ordinary SocketChannel, but for some of those connection, I have to use SSL ... |
I am using socket channel and NIO concept to read data from client.
How does Socket Channel knows when reading a file is completed?
ByteBuffer byteBuffer = ByteBuffer.allocate(BUFSIZE);
int nbytes = socketChannel.getChannel().read(byteBuffer);
I am ... |
I am using the SocketChannel Java class for a client/server application. I can send and retrieve data. But if my data contains '\n' then I do not read the correct data. ... |
How to read a very big data using DataInputStream of socket If the data is in String format and having a length of more than 1,00,000 characters.
Also How to write that ... |
I'm suffering a lot to create a simple ChatServer in Java, using the NIO libraries. Wonder if someone could help me.
I am doing that by using SocketChannel and Selector to handle ... |
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Was working my ... off on a handin project this evening, and suddenly the JVM started crashing on me. I've been able to create a simple program that can reproduce the ... |
I created a SocketChannel to a remote server to send and receive messages on Tomcat. To receive messages from a remote computer, I used a thread dedicated to task (only this ... |
I'm having a problem with a multiplayer game. Right now, I'm just trying to get the server to send the current level to the client. The server is definitely sending the ... |
I am trying to learn Java. I would like to implement a simple networked connect 4 game as well as a chat feature.
I want my network logic to be non blocking ... |
I am using Java NIO's SocketChannel to write : int n = socketChannel.write(byteBuffer); Most of the times the data is sent in one or two parts; i.e. if the data could ... |
I want to use a SocketChannel and to have a timeout for its read/write methods. I've tried to set a timeout for the Socket that owns my SocketChannel like this : ... |
I am building a non blocking server using javas NIO package, and have a couple questions about validating received data.
I have noticed that when i call read on a socket channel, ... |
If a write(ByteBuffer) completes, does it mean that the other side has received the data. Would TCP ensure that the data would reach other side?
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I have a socket running, using selectors. I am trying to check to see if my socket is connected to the server or not.
Boolean connected = _channel.isConnected();
and it always returns true. ... |
I'd have a question regarding java SocketChannel.
Say I have a socket channel opened in blocking mode; after calling the the write(ByteBuffer) method, I get an integer describing how many bytes were ... |
I am currently using a non-blocking SocketChannel (Java 1.6) to act as a client to a Redis server. Redis accepts plain-text commands directly over a socket, terminated by CRLF and responds ... |
I have been trying to work with NIO SocketChannels for some time now, and I am stumped regarding writing out to a SocketChannel. The following code is from my client:
...
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I am trying to write a Websockets client and server. Initially the connection is HTTP and the Websockets handshake uses HTTP headers to indicate that an upgrade to a new protocol ... |
The issue here is I can see that the data is being written out to the socket but it is not ALWAYS being sent.
Here's a code sniplet
ByteBuffer writeBuffer = ByteBuffer.allocate(8192);
writeBuffer.clear();
writeBuffer.put("heartbeat".getBytes());
writeBuffer.flip();
LOG.debug("is connected: ...
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I've found that the NIO is poorly documented at best except for the simplistic case. Even so, I've been through the tutorials and several refactors and ultimately pushed back to ... |
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 ... |
I noticed that SocketChannel.write does not throw any exception, when the underlying connection is in CLOSE-WAIT state. Is it expected behaviour? If so, how can I figure out that the connection ... |
SocketChannel is thread safe, so only one channel is need for communication between client and server. the channel served for read/write operations simultaneously
But, if we using multi channels (more ... |
Is there a way to extend SocketChannel in java so that the selection key will return my (let's say Client) class ? I think that i have to implement a socketFactory ... |
I have a timer on daemon thread which is continuously writing data into a socketchannel. In the main class I do not have the object reference of this socket channel, but ... |
In Java IO, an OutputStream can use flush() method to make sure data is sent at once.
Is there a corresponding function in Java NIO for SocketChannel? As far as ... |
I'm playing around with the NIO library. I'm attempting to listen for a connection on port 8888 and once a connection is accepted, dump everything from that channel to somefile.
I know ... |
I'm having a hard time figuring this one out. I have the following code:
if (selector.select(1000) <= 0) {
return;
...
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I've trouble with my code: i've written simple SocketChannel client with Selector, after starting it successfully reads messages from server (server sends events). But after writing to socket (see main method) ... |
In my program using java nio, the socketchannel.write() becomes very slow when it tries to write 10 KB messages consecutively. The measured time for writing a complete 10 KB message is ... |
I have question on usage java nio and hope someone who has a lot of java nio knowledge can help me to clarify some misconcept.
I am using java nio socket. It ... |
This might sound weird. I have created a game server based on a thread per socket structure (yes, only one thread per user; responses are sent to clients by worker threads). ... |
The ServerSocketChannel is used this way:
ServerSocketChannel srv = ServerSocketChannel.open();
srv.socket().bind(new java.net.InetSocketAddress(8112));
SocketChannel client = srv.accept();
When a connection is received, data is read this way:
ByteBuffer data = ByteBuffer.allocate(2000);
data.order(ByteOrder.LITTLE_ENDIAN);
client.read(data);
logger.debug("Position: {} bytes read!", data.position());
It prints:
... |
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I am using telnet to test it out. I telnet in and it works find, but it always says I'm still connected on the other side. I can even call isConnected(); on the channel and it still returns true. You need Java 1.5 to compile this since I am using BlockingQueue and Generics. You can find the precompiled versions at http://files.amdfanboy.com ... |
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I am using Java NIO Sockets and am looking for a way to actually shutdown the tcp socket without closing the SocketChannel. I found method "socketShutdownInput" and "socketShutdownOutput" but they really don't disconnect the socket connection. Right after calling these method if you invoke SocketChannel.isConnected you will get true. Is this bug in Socket NIO or is there actually way to ... |
Hi guys, I'm trying to write a very simple servlet container which uses NIO. I've got a Response class which receives in its constructor a SocketChannel is non blocking mode. This class implements javax.servlet.ServletResponse and I implemented the getWriter() method as follows (writer is of type PrintWriter, client is of type SocketChannel): public PrintWriter getWriter() { writer = new PrintWriter(client.socket().getOutputStream(), true); ... |
Hi experts, I am using nio package to transfer files from client to server. I use jdk1.4.2 on the client side (because have not upgraded our client code to new jre releases) and jdk1.5 on server side (because we use tomcat as webserver and latest tomcat is much stable and scalable but needs jre1.5). I use SocketChannel along with FileChannel to ... |
I am using JavaNIO for my socket application. Earlier I was using input output streams. Inputstream has a method called "available" that, without blocking, returns the number os bytes available for reading from the socket. Is there any similar method which i can use with SocketChannel for reading the data from socket. Basically I wanted to know how much the tcpip ... |
I am trying to learn the java nio stuff. What I am trying to do first is make a simple server/client where there is only 1 client and no selectors... just to try and get the non-blocking stuff down. All the resources I can find seem to be about how to use selectors, and doesn't answer the question I have. What ... |
Here is the code, any help/ideas/suggestions are greatly appreciated : package DataTransfer; import java.io.FileInputStream; import java.io.IOException; import java.io.OutputStream; import java.net.InetAddress; import java.net.Socket; import java.nio.channels.FileChannel; import java.nio.channels.SocketChannel; class Send extends Thread{ String receiverName; String senderName; String outputFileName; String inputFileName; public Send(String sn, String rn, String inf, String of){ senderName = sn; receiverName = rn; inputFileName = inf; outputFileName = of; } public ... |
I'm really, really new to Java but do know C and C++. I've a project at work that needs to be written in Java so I'm trying to learn reading both a beginner book and then looking at topics I'm going to need but know nothing about. I'v been able to use nio selectors (from an example in the Java NIO ... |
Hi.. This is Ramky.can any one please help regrading my Question in my project we have Server called GTM-GatewayServer this was Developed using Java Nio API we have so many Clients all Clients Apps Will connect to this server and they can send SMS to Mobile Users. here is MyQuestion that if any Client connected to This NioServer we are storing ... |
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Hello all, I am fairly new to socket programming and have run into a problem with SocketChannels. I am trying to split up a byte[] of length 20000 into smaller byte[] of 1000 and send them across the network to be put back together on the other side. I have split up the array and am sending them using the following ... |
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But you can get a stream from a socket channel with java.nio.channels.Channels, and you can even use it if the channel is in blocking mode, so you can wrap your PushbackInputStream around that ... ... but then you're losing most if not all of the point of using Channels in the first place ... |
Hello, I am developing a program that keeps track of socketChannels and a corresponding time of when they last updated their connection with a server. so my code for the map looks something like this: TreeMap map = new TreeMap( ); where the long presents the time in Millis since the epock year 1970 (which I get by ... |
Hi, The numRead is always greater than zero.Infact, it is equal to (1024 - NUMBER OF CHARACTERS SENT FROM THE OTHER SOCKET) Nothing is printed after the "THE MESSAGE FROM CLIENT IS".The variable "myString" is always empty.The result is always same even with one flip.You can consider cb.flip() to be commented out. Thanks, JCM |
This is really a question as to why (and WHEN) NIO is better than IOStreams. Try Googling for NIO, to find a good answer. Channels, in general, can be handy, because they provide support for asynchronous communication, But also, because they give you lower level access to the buffers that information comes in, allowing you to move through those buffers at ... |
Is it configureBlocking(false);? Isn't that O/S dependent? Winblows doesn't support nonblocking I/O at the lowest level, so neither can Java on winblows... Total complete absolute and utter rubbish from start to finish. Java NIO works on Windows in both blocking and non-blocking mode. Period. I have had non-blocking Java NIO code running on Windows for over five years, and I was ... |
Hi, Is there any way by which we can know the size of data ready to be read at the SocketChannel? When the "SelectionKey" is discovered to be "isReadable()" I would like to create the ByteBuffer of the required size and use it for the SocketChannel.read(ByteBuffer) method. Right now I have to statically fix the ByteBuffer size to some safe maximum ... |
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