How to make a screenshot service in Java?

Question

Java

Hello everyone
I want to make a service like Joxi.ru (screenshot) in Java. Those. a service that would allow you to take a screenshot with the ability to crop them, add arrows, add text. The application is needed under win/linux/mac + photos are stored on the server and the client receives a link to this screenshot.
How can this be done: applications + libs for working with images + side server?
It is advisable to use mainstream things, so that later it would be easier to get a job with them.

Answer 1

docs.oracle.com/javase/6/docs/api/java/awt/Robot.h...
Server - well, an api on anything that will take screenshots and save it on the server.

Answer 2

Well, you yourself have limited yourself to Java. And use it.
And the mainstream is now JS

Answer 3

Server - on anything, startup stacks are best suited, namely PHP, Ruby, Python.
The client can be different for each platform, even on different technologies (for example, Monosnap has a Windows version in C #, and a Mac version in Objective C). Most importantly, it should have access to the OS API.