piyrunner.java

PIY(Program It Yourself)是一个基于Java的应用程序开发环境

package piy;

import java.io.*;
import javax.swing.UIManager;
import java.util.*;

import java.util.jar.*;
import java.util.zip.*;

/**
* Runs a PIY Application Object.  The object will be loaded from a file specified in
* the arguments sent to the main method.  Note: If it's possible for the PIYRunner to
* know the identity of the Jar file it is loaded from, we could set this up to
* automatically run the application object.
* @author David Vivash
* @version 1.0.1, 21/04/01
*/
public class PIYRunner implements Observer {

	public static void main(String[] args) {
		if (args.length == 0) {
			System.out.println("Runs a PIY Application Object.");
			System.out.println("Usage java -jar <filename> <filename>");		
			System.out.println("Type 'java -jar <filename> <filename> -lf System' to get the system look and feel");		
			System.out.println("Example 1: java -jar MyApp.jar MyApp.jar");		
			System.out.println("Example 2: java -jar Notepad.jar Notepad.jar -lf system");		
		} else {

			//Use the system look and feel
			if (args.length == 3) {
				if (args[1].equalsIgnoreCase("-lf") && args[2].equalsIgnoreCase("System"))
					try{
						UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
					} catch (Exception e) { 
						//carry on regardless - ie. use standard look and feel
					}
			}
			
			try{
				System.setErr(new PrintStream(new FileOutputStream("Error.log")));
			} catch (Exception e) { 
				//carry on regardless - ie. use standard error output
			}
			
			new PIYRunner().runApplication(args[0]);
		}
	}
	
	/**
	* Load and run the Application with the specified filename.  The filename should be a valid
	* jar archive containing an application object named "Compiled".
	* @param filename the string representation of the filename of the application to load and run
	*/
	public void runApplication(String filename) {
		try{
			JarFile file = new JarFile(filename);
			ZipEntry appEntry = file.getEntry("Compiled");
						
			ObjectInputStream ois =  new ObjectInputStream(file.getInputStream(appEntry));
			Application app = (Application)ois.readObject();
			ois.close();
										
			//tell the application manager about our application, then run it
			ApplicationManager.getInstance().setApplication(app);
			app.start();

			//monitor the application so we can be told when it wishes to terminate
			new Thread(new ApplicationMonitor(app, (Observer)this)).start();
			
		} catch (Exception e) {
			System.out.println("Error loading application - " + filename);
			e.printStackTrace();			
		}		
	}
	
	//called when the application wishes to terminate
	public void update(Observable o, Object arg) {
		System.exit(0);
	}

}