Call shell scripts using java

You can use this informations for execute s.o. commands, jobs, scheduled process, low level functions, direct acess at filesystem, etc. Scalable solutions can be developed using a simple codes, see:

1) Create a new sh file example:

vi /etc/my_scripts/start_apache.sh

Content:
# execute your custom command to start apache depends of version / s.o. configs, etc
# /etc/init.d/httpd restart
# /etc/init.d/httpd start
# /etc/init.d/httpd stop
# /etc/init.d/httpd
# service httpd start 
apachectl start

2) With your script finished, go to development of our Java class:

package mypackage;

import java.io.BufferedWriter;
import java.io.IOException;
import java.io.OutputStreamWriter;

public class ServerControl {
   
    public void executeScript(final String scriptName) {
       
        BufferedWriter ouputCommand = null;
        Runtime r = Runtime.getRuntime();
        try {
            StringBuffer startApacheCommand = new StringBuffer();
            startApacheCommand.append("/etc/my_scripts/"+scriptName+"&");
           
            Process child = r.exec("/bin/sh");
            ouputCommand = new BufferedWriter(new OutputStreamWriter(child.getOutputStream()));

            ouputCommand.write(startApacheCommand.toString() + "\n");
            ouputCommand.flush();
           
        } catch (IOException e) {
            e.printStackTrace();
            // catch the exception...
        }
    }   
}

3) Now, build a jsp file to call developed java class:

vi /my_applications/example/my_script.jspx

...etc...

<jsp:useBean id="serverControl" class="mypackage.ServerControl" />

<jsp:scriptlet><![CDATA[ 

serverControl.executeScript("start_apache.sh");

// to call another stop_apache.sh script for example

// serverControl.executeScript("stop_apache.sh");

// to call another restart_apache.sh script for example

// serverControl.executeScript("restart_apache.sh");

// to call another restart_glassfish_domain.sh script for example

// serverControl.executeScript("restart_glassfish_domain.sh");

// to call another custom_script.sh script for example

// serverControl.executeScript("custom_script.sh");

]]></jsp:scriptlet> 

...etc....

 

4) Now, only call jsp from your server:
http://localhost:/my_application/example/my_script.jspx