Control java application from the outside

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Control java application from the outside

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#1 by (1 votes)

2

I created a java SE application that runs in the background, without swing or anything ... But how do I control this application? for example, in python applications we can execute commands (python something.py -c command1 -u command2), so I can have a control over the application, how would I do this with my java application?

And how can I control the application through another java application? For example: a panel made with swing with the options to pause the controlled application thread, continue, change configuration information, etc.

The application will run only on Linux.

java swing

asked by anonymous 27.05.2015 / 23:55

1 answer

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score 1 · Accepted Answer

One solution to your case might be the use of the ServerSocket class. In your background application you can leave as a server listening to a specific port. And in another application you can send commands through the socket, with this you can manipulate your application server knowing only the IP and port;

Server Side

import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.io.BufferedReader;  
import java.io.InputStreamReader;  

public class Server {  

    public static void main(String[] args) {  

        ServerSocket serv=null;  // Declara o socket 
        Socket s= null; // Socket de comunicação  

        BufferedReader entrada=null; //Leitor para a entrada de dados  

        try{  
            //Cria o ServerSocket na porta 9000   
            serv = new ServerSocket(9000);  
            //Aguarda uma conexão na porta especificada e cria   
            s = serv.accept();  
            //Cria um BufferedReader para o canal da stream de entrada de dados do socket  
            entrada = new BufferedReader(new InputStreamReader(s.getInputStream()));  

            //Aguarda por algum dado e imprime a linha recebida quando recebe  
            System.out.println(entrada.readLine());      

        }catch(IOException e){  
            System.out.println("Falha ao criar socket.");  
        }finally{  
            try{  
                //Encerra o socket  
                s.close();  
                //Encerra o ServerSocket  
                serv.close();  
            }catch(IOException e){  

            }  
        }  

}

}

Client side

import java.io.IOException;  
import java.io.PrintStream;  
import java.net.Socket;  

public class Client {  

public static void main(String[] args){           
    Socket mSocket = null;  
    PrintStream mPrintStream = null;  

    try{  

    int x = 20;  
    mSocket = new Socket("<_ENDEREÇO_IP_>",9000);  
    mPrintStream = new PrintStream(mSocket.getOutputStream());  
    mPrintStream.println(x);  

    }catch(IOException e){                
    System.out.println("Falha ao enviar dados." + e.getMessage());  

    }finally{  
        try{  
            //Fecha o socket  
            mSocket.close();  
        }catch(IOException e){}  

    }  
}  
}