Wieder mal JAVA und Plug-In's

start ...
z. B. start sheduler
oder start sheduler.jar

package pluginsystem;

public interface OutputPlugin {
	public void zeigText();
}

import pluginsystem.OutputPlugin;

public class SagWasPlugin implements OutputPlugin {
	@Override
	public void zeigText() {
		Muha.sagWas();
	}
}

public class Muha {
	public static void sagWas() {
		System.out.println("Sag was...");
	}
}

import pluginsystem.OutputPlugin;

public class SagAufWiedersehenPlugin implements OutputPlugin {
	@Override
	public void zeigText() {
		System.out.println("Auf wiedersehen");
	}
}

import pluginsystem.OutputPlugin;

public class SagHalloPlugin implements OutputPlugin {
	@Override
	public void zeigText() {
		System.out.println("Hallo");
	}
}

package pluginsystem;



import java.io.File;

import java.net.MalformedURLException;

import java.net.URL;

import java.net.URLClassLoader;

import java.util.ArrayList;



public class Main {

	public static void main(String[] args) {

		ArrayList<OutputPlugin> list = new ArrayList<OutputPlugin>();

		File pluginDir = new File("./plugins");



		// Plugins laden

		File[] jars = pluginDir.listFiles();

		for(File jar : jars) {

			try {

				URL url = new URL("file", "localhost", jar.getAbsolutePath());

				URLClassLoader loader = new URLClassLoader(new URL[]{url});

				Class<?> clazz = loader.loadClass(jar.getName().substring(0,

						jar.getName().lastIndexOf(".")) + "Plugin");

				OutputPlugin plugin = (OutputPlugin)clazz.newInstance();



				// Plugin-Objekt in die Liste aufnehmen

				list.add(plugin);

			} catch(MalformedURLException e) {

				e.printStackTrace();

			} catch(ClassNotFoundException e) {

				e.printStackTrace();

			} catch(InstantiationException e) {

				e.printStackTrace();

			} catch(IllegalAccessException e) {

				e.printStackTrace();

			}

		}



		// Alle Plugins ausführen

		for(OutputPlugin plugin : list) {

			plugin.zeigText();

		}

	}

}

package de.tutorials.appserver;

public interface Application {
  void start();
}

package de.tutorials.appserver;

import java.util.ServiceLoader;

public class Main {
  public static void main(String[] args) {
    ServiceLoader<Application> applications = ServiceLoader.load(Application.class);
    
    System.out.println("Starting applications");
    for(Application application : applications){
      application.start();
    }
  }
}

package de.tutorials.appserver.application;

import de.tutorials.appserver.Application;

public class DefaultApplication implements Application {
  public void start() {
    System.out.println("starting default application");
  }
}

de.tutorials.appserver.application.DefaultApplication

C:\temp\pluginSystem>java -cp appserver.jar de.tutorials.appserver.Main
Starting applications
starting default application

package de.tutorials.appserver.anotherApplication;

import de.tutorials.appserver.Application;

public class AnotherApplication implements Application {
  public void start() {
    System.out.println("starting another application");
  }
}

de.tutorials.appserver.anotherApplication.AnotherApplication

C:\temp\pluginSystem>java -cp appserver.jar de.tutorials.appserver.Main
Starting applications
starting default application

C:\temp\pluginSystem>java -cp appserver.jar;anotherApplication.jar de.tutorials.appserver.Main
Starting applications
starting default application
starting another application

C:\temp\pluginSystem>tree /F /A
Auflistung der Ordnerpfade
Volumeseriennummer : D205-4274
C:.
|   appserver.jar
|
\---dropin
        anotherApplication.jar

C:\temp\pluginSystem>java -cp appserver.jar;dropin/* de.tutorials.appserver.Main
Starting applications
starting default application
starting another application

package de.dfthq..utils.pih;
import java.io.*;
import java.nio.channels.*;
public class a
{
	private static boolean check=true;
	protected static final int VERSION=1000056;
	protected b bco=null;
	protected c cco=null;
	public static void main(String[] args)
	{
		for(int i=0; i<args.length; i++)
		{
			if(args[i].equals("-nocheck"))
				check=false;
		}
		new a();
	}
	protected a()
	{
		if(check)
		{
			try
			{
				FileChannel lfc=(new RandomAccessFile(new File(System.getProperty("user.home")+System.getProperty("file.separator")+".pih"), "rws")).getChannel();
				FileLock lfl=lfc.tryLock();
				if(lfl==null)
					exit();
			}
			catch(Exception e) { exit(); }
		}
		bco=new b(this);
		bco.load();
		cco=new c(this);
		try { cco.load(); } catch(Exception e) { e.printStackTrace(); }
		cco.startPlugins();
	}
	protected void exit()
	{
		System.exit(0);
	}
	public void registerPlugin(String s)
	{
		System.out.println(s);
	}
}

package de.dfthq..utils.pih;
import de.dfthq..utils.lib.*;
import java.io.*;
import java.net.*;
import java.util.*;
class c
{
	protected a aco=null;
	protected ArrayList<PluginInterface> list=new ArrayList<PluginInterface>();
	protected c(a aco)
	{
		this.aco=aco;
	}
	protected void load() throws Exception
	{
		File pluginDir=new File((new File(".")).getCanonicalFile(), "plugins");
		File[] jars=pluginDir.listFiles(new FileFilter() {
			public boolean accept(File f)
			{
				return f.getName().toLowerCase().endsWith(".jar");
			}});
		if(jars.length==0)
			return;
		for(File jar : jars)
		{
			URL url=jar.toURI().toURL();
			URLClassLoader loader=new URLClassLoader(new URL[] { url });
			Class<?> clazz=loader.loadClass(jar.getName().substring(0, jar.getName().lastIndexOf("."))+"Plugin");
			PluginInterface plugin=(PluginInterface)clazz.newInstance();
			list.add(plugin);
		}
	}
	protected void startPlugins()
	{
		for(PluginInterface plugin : list)
		{
			plugin.load(aco);
			plugin.doit();
		}
	}
}

package de.dfthq..utils.lib;
import de.dfthq..utils.pih.*;
public interface PluginInterface
{
	void load(a aco);
	void doit();
}

import de.dfthq..utils.lib.*;
import de.dfthq..utils.pih.*;
public class captchaPlugin implements PluginInterface
{
	protected a aco=null;
	public captchaPlugin() { }
	public void load(a aco)
	{
		this.aco=aco;
	}
	public void doit()
	{
		aco.registerPlugin("CAPTCHA PLUGIN");
	}
}

import de.dfthq..utils.lib.*;
import de.dfthq..utils.pih.*;
public class loginPlugin implements PluginInterface
{
	protected a aco=null;
	public loginPlugin() { }
	public void load(a aco)
	{
		this.aco=aco;
	}
	public void doit()
	{
		aco.registerPlugin("LOGIN PLUGIN");
	}
}

I:\java\pih>java -jar pih.jar
CAPTCHA PLUGIN
LOGIN PLUGIN