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

public class GmailMailAttach {
    public static void main (String args[]) throws Exception {
        String host = "pop.gmail.com";
        String username = "amitt800"; //Put here Gmail Username without @ sign
        String password = "123456"; // put here Gmail password
        Session session = Session.getInstance(new Properties(), null);
        Store store = session.getStore("pop3s");
        store.connect(host, username, password);
        Folder folder = store.getFolder("INBOX");
        folder.open(Folder.READ_ONLY);
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        Message message[] = folder.getMessages();
       Enumeration headers = message[i].getAllHeaders();
       while (headers.hasMoreElements()) {
             Header h = (Header) headers.nextElement();
             System.out.println(h.getName() + ": " + h.getValue());
       }

        for(int i=0, n=message.length; i++) {
            System.out.println(i + ": " + message[i].getFrom()[0]+ "\t" + message[i].getSubject());
            System.out.println("Want to get the content? [Y to read/Q to end]");
            String ans = reader.readLine();
            ans=ans.toLowerCase();
            if ("y".equals(ans)) {
                Object content = message[i].getContent();
                if (content instanceof Multipart) {
                    handleMultipart((Multipart)content);
                }
                else {
                    handlePart(message[i]);
                }
            }
            else if ("q".equals(ans)) {
                break;
            }
        }
        folder.close(false);
        store.close();
    }
    public static void handleMultipart(Multipart multipart) throws MessagingException, IOException {
        for (int i=0, n=multipart.getCount(); i
            handlePart(multipart.getBodyPart(i));
        }
      }
    public static void handlePart(Part part)  throws MessagingException, IOException {
        String dposition = part.getDisposition();
        String cType = part.getContentType();
        if (dposition == null) {
            System.out.println("Null: "  + cType);
            if ((cType.length() >= 10) && (cType.toLowerCase().substring(0, 10).equals("text/plain"))) {
                part.writeTo(System.out);
            }
            else {
                System.out.println("Other body: " + cType);
                part.writeTo(System.out);
            }
        }
        else if (dposition.equalsIgnoreCase(Part.ATTACHMENT)) {
            System.out.println("Attachment: " + part.getFileName() + " : " + cType);
            saveFile(part.getFileName(), part.getInputStream());
        }
        else if (dposition.equalsIgnoreCase(Part.INLINE)) {
            System.out.println("Inline: " + part.getFileName() +  " : " + cType);
            saveFile(part.getFileName(), part.getInputStream());
        }
        else {
            System.out.println("Other: " + dposition);
        }
    }

    public static void saveFile(String filename,InputStream input) throws IOException {
        if (filename == null) {
            filename = File.createTempFile("MailAttacheFile", ".out").getName();
        }
        System.out.println("downloading attachment...");
        File file = new File(filename);
        for (int i=0; file.exists(); i++) {
            file = new File(filename+i);
        }
        FileOutputStream fos = new FileOutputStream(file);
        BufferedOutputStream bos = new BufferedOutputStream(fos);
        BufferedInputStream bis = new BufferedInputStream(input);
        int fByte;
        while ((fByte = bis.read()) != -1) {
            bos.write(fByte);
            }
        bos.flush();
        bos.close();
        bis.close();
        System.out.println("done attachment...");
    }
}