Java Code to Detect and Write Sitemap Manually

Here the simple Java code to make a mini application to create sitemap in my static web. I build with JFrame and FileOutputStream for write result to file.

package sitemap.maker;

import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Writer;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSeparator;
import javax.swing.JTextField;
import javax.swing.border.EmptyBorder;

public class SiteMapMaker extends JFrame
{
    private JTextField jnama=new JTextField(25);
    private JLabel jl = new JLabel();
    private String checkIndexPHP(String path,int id,File folder)
    {
        File[] files = folder.listFiles();
        String hasil="";
        for (File file : files)
        {
            if(file.isDirectory()){
                hasil+=checkIndexPHP(path+"/"+file.getName(),id++,file);
            }else{
                if(file.getName().equals("index.php")){
                    hasil+="<url>\n" +
                            "  <loc>"+path+"</loc>\n" +
                        "</url>\n";
                }
            }
        }
        return hasil;
    }
    
    public void makeSitemap()
    {
        String content="<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" +
                "<urlset\n" +
                "      xmlns=\"http://www.sitemaps.org/schemas/sitemap/0.9\"\n" +
                "      xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"\n" +
                "      xsi:schemaLocation=\"http://www.sitemaps.org/schemas/sitemap/0.9\n" +
                "            http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd\">\n";
        
        File folder = new File(System.getProperty("user.dir"));
        String namasite="http://www.example.com";
        if(!jnama.getText().isEmpty())namasite=jnama.getText();
        if(folder.isDirectory()){
            content+=checkIndexPHP(namasite,0,folder);
        }
        try {
            //Whatever the file path is.
            File statText = new File("sitemap.xml");
            FileOutputStream is = new FileOutputStream(statText);
            OutputStreamWriter osw = new OutputStreamWriter(is);    
            Writer w = new BufferedWriter(osw);
            w.write(content);
            w.close();
            setFinish();
        } catch (IOException e){
            System.err.println("Problem writing to the file sitemap.xml");
        }
    }
    
    public void callThread()
    {
        jl.setText("Creating sitemap, please wait...");
        
        Thread th=new Thread(new Runnable(){
            public void run(){
                makeSitemap();
            }
        });
        th.start();
    }
    
    public void setFinish()
    {
        jl.setText("Sitemap created!");
        this.pack();
    }
    
    public void showFrame()
    {
        this.setSize(200,80);
        this.setLocation(200,200);
        
        JPanel panel=new JPanel();
        BoxLayout boxLayout = new BoxLayout(panel, BoxLayout.Y_AXIS);
        panel.setBorder(new EmptyBorder(10, 10, 10, 10));
        panel.setLayout(boxLayout);        
        panel.add(new JLabel("Name Website"));
        panel.add(Box.createRigidArea(new Dimension(0,5)));
        jnama.setText("http://example.com");
        panel.add(jnama);
        panel.add(Box.createRigidArea(new Dimension(0, 5)));
        JButton b=new JButton("Click Here");
        b.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                callThread();
            }
        });  
        panel.add(b);
        panel.add(Box.createRigidArea(new Dimension(0, 5)));
        jl.setText("");
        panel.add(jl);
        this.add(panel);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        this.pack();
        this.setVisible(true);
    }
    
    public static void main(String[] args){
        SiteMapMaker sitemap=new SiteMapMaker();
        sitemap.showFrame();
    }    
}