import javax.mail.*;
import javax.mail.internet.*;
import java.util.*;


public class AllHeaderClient {

  public static void main(String[] args) {
    
    if (args.length == 0) {
      System.err.println(
       "Usage: java AllHeaderClient protocol://username@host/foldername");
      return; 
    }
    
    URLName server = new URLName(args[0]);

    try {

      Session session = Session.getDefaultInstance(new Properties(), 
       new MailAuthenticator(server.getUsername()));

      // Connect to the server and open the folder
      Folder folder = session.getFolder(server);
      if (folder == null) {
        System.out.println("Folder " + server.getFile() + " not found.");
        System.exit(1);
      }  
      folder.open(Folder.READ_ONLY);
      
      // Get the messages from the server
      Message[] messages = folder.getMessages();
      for (int i = 0; i < messages.length; i++) {
        System.out.println("------------ Message " + (i+1) 
         + " ------------");
        // Here's the difference...
        Enumeration headers = messages[i].getAllHeaders();
        while (headers.hasMoreElements()) {
          Header h = (Header) headers.nextElement();
          System.out.println(h.getName() + ": " + h.getValue());
        }       
        System.out.println();
      } 

      // Close the connection 
      // but don't remove the messages from the server
      folder.close(false);
      
    } 
    catch (Exception ex) {
      ex.printStackTrace();
    }  
          
    // Since we may have brought up a GUI to authenticate,
    // we can't rely on returning from main() to exit
    System.exit(0);     
    
  }
}