OpenMRS

import javax.swing.*;
import java.io.*;
import javax.swing.filechooser.FileNameExtensionFilter;

public class AddLicense extends JFrame {

    public AddLicense() {
        super("Add License to Code");
        FileNameExtensionFilter filter = new FileNameExtensionFilter("Java Source", "java");
        JFileChooser chooser = new JFileChooser();
        chooser.setCurrentDirectory(new File("C:\\openMRS\\src\\web\\org\\openmrs"));
        chooser.setFileFilter(filter);
        chooser.setMultiSelectionEnabled(true);
        int result = chooser.showOpenDialog(null);
        if (result == JFileChooser.APPROVE_OPTION) {
            String license = "/**\n * The contents of this file are subject to the OpenMRS Public License\n * Version 1.0 (the \"License\"); you may not use this file except in\n * compliance with the License. You may obtain a copy of the License at\n * http://license.openmrs.org\n *\n * Software distributed under the License is distributed on an \"AS IS\"\n * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the\n * License for the specific language governing rights and limitations\n * under the License.\n *\n * Copyright (C) OpenMRS, LLC.  All Rights Reserved.\n */";
            File[] file = chooser.getSelectedFiles();
            try {
                for (int i = 0; i < file.length; i++) {
                    if (file[i].isDirectory()) {
                        //file[i].listFiles(filter);
                    } else {
                        String str = new String();
                        FileReader reader = new FileReader(file[i]);
                        int c = reader.read();
                        while (c != -1) {
                            str = str + (char) c;
                            c = reader.read();
                        }
                        reader.close();
                        if (!str.contains("The contents of this file are subject to the OpenMRS")) {
                            FileWriter writer = new FileWriter(file[i]);
                            BufferedWriter bw = new BufferedWriter(writer);
                            bw.write(license);
                            bw.newLine();
                            bw.write(str);
                            bw.close();
                            writer.close();
                            System.out.println("Updated File " + file[i].getAbsolutePath());
                        }
                    }
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(640, 480);
    }

    public static void main(String args[]) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                AddLicense window = new AddLicense();
                window.setVisible(true);
            }
        });
    }
}