Well, I've been playing around with php for the last week or so, and I am wondering how I would use it to get data from a Java application. i.e: the php script sends a request to the server and asks for a response. In my particular case I want to do just that: I would like to have a java application waiting, and the php would "ask a question" to detemine if it is on or off (the server would not respond if it is off, and would if it is on - type of thing).
My question is: How do I communicate with a php script through java. How do I make requests to an application through php?
Any ideas?
If your PC is the server, then you can write a Java based server that listens to a socket -> then do something in java program when communication is received. Here's a simple example.
For real life implementation though, I'd suggest you use the PHP/Java Bridge instead. It's much faster and optimized for this sort of operations.
PHP has the ability to make web calls, open and communicate through sockets, SOAP, RPC, etc. It all depends on how your Java program would be listening.
Additionally, PHP can be written as a socket server, so your Java program could talk to it via web calls, socket or any other sort of server technology you choose.
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I'm developing a Desktop LAN base java server and client application
where a Client must login and also to pass some data to server.
assuming i have 10 clients that inserting record simultaneously to server.
which is the best approach in this kind of situation, should I use RMI for login and record insertion? or Sockets?
if sockets please provide a key idea for me to start with.
key points to consider
-Multithreading
-able to send back data on client
If you want to connect your server via internet (and/or firewalls) it is probably a hassle to do this with plain RMI. In the past I have used Java Simon for such tasks which is very easy to implement. However if you plan to support other clients than Java clients, then you should have a look at Apache Thrift or Google Protocoll Buffers
Is it possible to read datastream sent from C++ server program to C++ client over socket connection in java? I have details like port number and server IP.
Or do I need decompile the whole C++ client into Assembly and then somehow translate it into java to do that?
I'm really not sure what kind of data it's transforming, though.. Somebody told me to code HTTP server and run it on my Router but I'm not really sure if that would work?
Here’s the diagrammatic way to look at it.
Server generates data.
it puts it in a packet.
it encrypts the packet.
and sends it over the wire.
It gets to a user’s Computer (= client). (I should be in the control now on..)
(If I could somehow read data at this part?)
The client reads the encrypted packet.
(If I could somehow read data at this part?) (The later, the better :D)
The client decrypts the packet.
(If I could somehow read data at this part?) (The later, the better :D)
The client does something.
As said, the client is .exe file and it's coded using C++. And I don't have source code of it.
All you have to do is define well your application protocol. This is, the format of your data stream. As long as you are using the same format in both ends, it doesn't really matter what language or program you are using. Imagine your browser and the web server. They are both using the same application protocol (HTTP) but they are completely different programs. Even more, there exists different web servers and different browsers.
Then, all you need to do is use the java sockets to listen to some specific port, and use your c++ sockets to write to the specific port. Just make sure you know how the information is "organized".
I am having difficulties understanding the difference between network mode and non-network mode terms as used when dealing with client server applications in java.
I know how to develop simple client server apps. For example I can create a client application and server application. These applications can connect to through sockets and send and receive data. I however get confused when people talk about running a server and client in standalone mode, where both the client and server use the same instance of a JVM without loop back networking involved. I have seen this happening with the java derby database.
So my main question is how do you take code that was using sockets to communicate and convert it to use the so called "standalone mode" where the client and server run as one application? I will appreciate any comments that point me to the right material.
In the so-called network mode you have to connect to a remote server, as you describe, typically through a socket and so your client asks the server to do certain task, the server carries out the task and responds to the client.
In this mode, it is customary that the client and the server will be different nodes, that is different machines, running independently.
But what if you wanted to run you client and your server in the same machine? Even in the same virtual machine? Would it make sense to go through a socket to ask your server to do something?
That would be like using Skype to chat with a friend sat right by your side, to simply ask him to go have lunch.
So, ideally, in these cases, you should be able to run your application in non-network mode. That is, instead of going through a socket, you access your sever object directly and ask it to do something for you. Since your server object is located in the same virtual machine as your client.
Evidently, for you to be able to do this, you need a good design that exposes your server functionality through an interface, and your application uses this interface to interact with the server. When you are running in network mode, you use an implementation of this server interface that uses a socket (or RMI or whatever you do for network communication). When you are in non-network mode, you get an implementation of the server object itself.
I am trying to learn how to make a multiple-client chatting program. Im following the Oracle tutorial on Custom Networking, but its not really what I am looking for. So far, I have no code of my own to share, all of it is copied from the Oracle tutorial and I think pasting it here would be a copyright infringement(??).
link at: http://docs.oracle.com/javase/tutorial/networking/sockets/clientServer.html+
client code link: http://docs.oracle.com/javase/tutorial/displayCode.html?code=http://docs.oracle.com/javase/tutorial/networking/sockets/examples/KnockKnockClient.java
anyway, I have the server-client working where the server tells knock knock jokes, the client reads and prints, then the user replies and so on. how would i start to edit it to have the client talk to the other clients directly?
im sorry, i have no background with networking at all. if anyone can direct me to a informative source better suited to my goals i would appreciate it.
as in the Knock-Knock example, each client connects to the server, but they not mutually directly connected.
There is a solution to make a forwarding sever :Arrange each client an id, and clients use id to identify their talking partners.
To do this, you have to modify the client to server data format from a plain string to a tuple like (String,Id). And, when the server receive the data, it parses out the id, get the corresponding client socket and then write the data.
The required level of complexity just went up a notch as your going to need some sort of "interprocess communications" infrastructure to allow client to client communication (possibly via sockets marshalled by the server?)
I am developing system, that consists of client (written in JavaFX) and server. Now I am going to implement server. Users will download clients. Clients will communicate with server (only one server and many clients). Server will communicate with data base and send results. Server will support authentication and different requests (not http of course). Is it a good idea to implement server with Java RMI? If no, could you advice me any good idea about server realisation.
Thanks a lot for future questions!
RMI is bit kind of traditional but still powerful to me ,it has some draw back . But, despite the RMI there is also a chance for you to use java sockets class ? just like a client -server application ...