如何通过java编码在服务器上找到连接的系统？

Question

I have one java application. That application works like getting the PC informations(Hardware and profile details). So I want to get the which system connected on the server when that application running on the server. How its possible? I dont have about this. Give me the idea's about this.

Simply server is parent means i want to find child system's through java coding.

Answer 1

I have 3 little ideas maybe some of them can inspire you or give you some tips.

Idea 1:

Detect and log the IP addresses and the time the users connect to your application.

Something like this i think should allow you to get the IP:

public void service(HttpServletRequest req, HttpServletResponse res) 
 throws IOException {
   String ip = req.getRemoteAddr();
   Date date = new Date();
   MyLogger.log(ip,date);
  }

If req.getRemoteAddr() dont work try(The clients IP has to be somewhere on the header):

request.getHeader("x-forwarded-for") See Link

Idea 2:

About knowing the type of system that is connected to the server, i think JMX can do some of that for you if the remote system allows it. I never used it but i think you can do certain monitoring thinks with it.

Idea 3:

I think the best way to detect information about the clients machine, is having an application running in that concrete client machine. An applet. I am not sure about this one, but if i remember good applets execute on client side, maybe you could find the way to put one in your web-app so it can detect information about the client system easily and then forward it back to the app server.(As i said i am not sure if this is possible)

Idea 4

Find third party software, maybe a web service(Some kind of advanced whois web service) that gets the info for you when you send just a parameter(exmample: Ip address)

This api might help you: jpcap

PS also having a quick look to the sockets chapter of the java tutorials, can also become handy.