Re: Remote Tomcat webapps bidirectional communication
Hello I think that application to application calls should be implemented with web services (there is much choice but maybe heavy to implement). When implementing such a solution, particularly if trafic goes through internet, you must check that you're using a firewall in order to avoid false requests that could from hackers. A.T. 2014-06-14 23:56 GMT+02:00 Lmhelp1 lmhe...@orange.fr: Hello, My question is about what code to write to allow two remote Tomcat webapps to communicate with one another through the Internet. Let me explain more precisely what I would like to do. (I'm just simplifying a bit the real situation). - I have a Tomcat webapp running on a server in England. - I have another Tomcat webapp running on a server in France. - I have a JSP inside the England webapp. - This JSP contains a form with two fields First name and Last name. - I would like to send these information to the France webapp. - After the England form has been submitted, I can collect the information First name and Last name in a servlet. Can you tell me what I shall do then to send these information to the France webapp? Is it something like a response.sendRedirect(...? How does it have to be written? - Meantime, the France webapp needs to be able to wait for these information and, when they arrive, to get them and do something with them. For example store the First name and Last name in a database, etc. What kind of a code has to be written in the France webapp? Is it a servlet with a doGet() retrieving the information First name and Last name? - Moreover, when the France webapp has finished it's job, it needs to tell the England webapp that it has finished, send it a file and some information. So the communication has to be bidirectional. Can you please give me some indications on how to start dealing with this? Or maybe a tutorial or an example? Thank you and best regards. -- Léa Massiot - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Remote Tomcat webapps bidirectional communication
Lmhelp1 wrote: Hello, My question is about what code to write to allow two remote Tomcat webapps to communicate with one another through the Internet. Let me explain more precisely what I would like to do. (I'm just simplifying a bit the real situation). - I have a Tomcat webapp running on a server in England. - I have another Tomcat webapp running on a server in France. - I have a JSP inside the England webapp. - This JSP contains a form with two fields First name and Last name. - I would like to send these information to the France webapp. - After the England form has been submitted, I can collect the information First name and Last name in a servlet. Can you tell me what I shall do then to send these information to the France webapp? Is it something like a response.sendRedirect(...? How does it have to be written? - Meantime, the France webapp needs to be able to wait for these information and, when they arrive, to get them and do something with them. For example store the First name and Last name in a database, etc. What kind of a code has to be written in the France webapp? Is it a servlet with a doGet() retrieving the information First name and Last name? - Moreover, when the France webapp has finished it's job, it needs to tell the England webapp that it has finished, send it a file and some information. So the communication has to be bidirectional. Can you please give me some indications on how to start dealing with this? Or maybe a tutorial or an example? This is only vaguely a Tomcat question, in the sense that : - for receiving and processing a HTTP POST request (from a browser usually, but in your case it would be a Tomcat servlet or a program running somewhere else), a normal webapp is what you need. - for creating and sending a HTTP POST request, you will need a library that offers such functions, such as the HTTPClient library, found here : http://projects.apache.org/projects/httpcomponents_client.html There is documentation and examples available at : http://hc.apache.org/index.html. Make sure you read them. Note that any java program could use this, there is nothing special about using it within a java servlet. And note that when one of your servlets issues a HTTP request to another server, Tomcat knows absolutely nothing about it, and there is no Tomcat code involved (on the request-sending side). Note also that for what you describe as the France webapp above, that functionality does not necessarily need a Tomcat and a Tomcat webapp. You could use the code of http://projects.apache.org/projects/httpcomponents_core.html to create a stand-alone java network server, which just listens for this particular kind of request, and responds by the information that you describe. Similarly, your England webapp does not necessarily need to send the request to the France server as a HTTP request, nor expect a HTTP response. What I believe would be the trickiest part in that kind of application, is to handle the various error scenarios : network down between England and France, French server down, French server taking a (too) long time to respond, French server returning an error, etc.. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Remote Tomcat webapps bidirectional communication
Hello André, Thank you for your detailed answer, your accurate terminology and the links you sent me. About the scenario I described in my first message: I could make it work. [André Warnier wrote:] And note that when one of your servlets issues a HTTP request to another server, Tomcat knows absolutely nothing about it, and there is no Tomcat code involved (on the request-sending side). Ah? Ok. What is actually taking care of the HTTP request then? [André Warnier wrote:] [...] for creating and sending a HTTP POST request [...] [...] to create a stand-alone java network server, which just listens for this particular kind of request, and responds by the information that you describe [...] I actually have another scenario in which a C++ executable has to send a HTTP request to a Tomcat Webapp. I would need to build the HTTP request inside the C++ code and then send it to the Tomcat Webapp. I haven't yet looked for a solution... Again thank you and best regards. -- Léa On 2014-06-16 5:51 PM, André Warnier wrote: Lmhelp1 wrote: Hello, My question is about what code to write to allow two remote Tomcat webapps to communicate with one another through the Internet. Let me explain more precisely what I would like to do. (I'm just simplifying a bit the real situation). - I have a Tomcat webapp running on a server in England. - I have another Tomcat webapp running on a server in France. - I have a JSP inside the England webapp. - This JSP contains a form with two fields First name and Last name. - I would like to send these information to the France webapp. - After the England form has been submitted, I can collect the information First name and Last name in a servlet. Can you tell me what I shall do then to send these information to the France webapp? Is it something like a response.sendRedirect(...? How does it have to be written? - Meantime, the France webapp needs to be able to wait for these information and, when they arrive, to get them and do something with them. For example store the First name and Last name in a database, etc. What kind of a code has to be written in the France webapp? Is it a servlet with a doGet() retrieving the information First name and Last name? - Moreover, when the France webapp has finished it's job, it needs to tell the England webapp that it has finished, send it a file and some information. So the communication has to be bidirectional. Can you please give me some indications on how to start dealing with this? Or maybe a tutorial or an example? This is only vaguely a Tomcat question, in the sense that : - for receiving and processing a HTTP POST request (from a browser usually, but in your case it would be a Tomcat servlet or a program running somewhere else), a normal webapp is what you need. - for creating and sending a HTTP POST request, you will need a library that offers such functions, such as the HTTPClient library, found here : http://projects.apache.org/projects/httpcomponents_client.html There is documentation and examples available at : http://hc.apache.org/index.html. Make sure you read them. Note that any java program could use this, there is nothing special about using it within a java servlet. And note that when one of your servlets issues a HTTP request to another server, Tomcat knows absolutely nothing about it, and there is no Tomcat code involved (on the request-sending side). Note also that for what you describe as the France webapp above, that functionality does not necessarily need a Tomcat and a Tomcat webapp. You could use the code of http://projects.apache.org/projects/httpcomponents_core.html to create a stand-alone java network server, which just listens for this particular kind of request, and responds by the information that you describe. Similarly, your England webapp does not necessarily need to send the request to the France server as a HTTP request, nor expect a HTTP response. What I believe would be the trickiest part in that kind of application, is to handle the various error scenarios : network down between England and France, French server down, French server taking a (too) long time to respond, French server returning an error, etc.. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Remote Tomcat webapps bidirectional communication
Hello, My question is about what code to write to allow two remote Tomcat webapps to communicate with one another through the Internet. Let me explain more precisely what I would like to do. (I'm just simplifying a bit the real situation). - I have a Tomcat webapp running on a server in England. - I have another Tomcat webapp running on a server in France. - I have a JSP inside the England webapp. - This JSP contains a form with two fields First name and Last name. - I would like to send these information to the France webapp. - After the England form has been submitted, I can collect the information First name and Last name in a servlet. Can you tell me what I shall do then to send these information to the France webapp? Is it something like a response.sendRedirect(...? How does it have to be written? - Meantime, the France webapp needs to be able to wait for these information and, when they arrive, to get them and do something with them. For example store the First name and Last name in a database, etc. What kind of a code has to be written in the France webapp? Is it a servlet with a doGet() retrieving the information First name and Last name? - Moreover, when the France webapp has finished it's job, it needs to tell the England webapp that it has finished, send it a file and some information. So the communication has to be bidirectional. Can you please give me some indications on how to start dealing with this? Or maybe a tutorial or an example? Thank you and best regards. -- Léa Massiot - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
