Creating your own maven plugin

Maven plugin:
Project->New->Maven Project->Next then select:


Your Mojo class will look like:

import org.apache.maven.plugin.AbstractMojo;
import org.apache.maven.plugin.MojoExecutionException;

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;

/**
* Goal which touches a timestamp file.
*
* @goal ddw
*
* @phase process-sources
*/
public class MyMojo extends AbstractMojo {
 /**
  * Location of the file.
  * expression says which parameter to use
  * @parameter expression="${outputDirectory}"

  * @required
  */
 private File outputDirectory;

 public void execute() throws MojoExecutionException {
     File f = outputDirectory;

     if (!f.exists()) {
         f.mkdirs();
     }

     File touch = new File(f, "touch.txt");

     FileWriter w = null;
     try {
         w = new FileWriter(touch);

         w.write("touch.txt");
     } catch (IOException e) {
         throw new MojoExecutionException("Error creating file " + touch, e);
     } finally {
         if (w != null) {
             try {
                 w.close();
             } catch (IOException e) {
                 // ignore
             }
         }
     }
 }
}

This plugin just creates file. Pay attention that comments are really a part of function.
Then you can run it via command line:
mvn groupId:artifactId:version:goal

In this case go to your project directory

mvn com.ddw.plugin:ddw-plugin:0.0.1-SNAPSHOT:ddw -DoutputDirectory="C:\tmp"