通过JAVA连接到ec2实例

I have created REST API to create EC2 instance using AWS JAVA SDK provided. Now I am trying to connect to created EC2 instance and then need to install software's in the instance again through java. I didn't find any appropriate article for this. Is there any possible way to do this? I don't want to use SSH client like putty.. Thanks..I have created REST API to create EC2 instance