How to get the list of available folders in a mail account using JavaMail

Question

I am using JavaMail API to connect to my personal account. I have list of folders (labels) in my Gmail account which I created + the default folders like Inbox, Drafts etc.

Answer 1

Here is the code that works. This will give you handle to all the Labels. To go deeper in a folder, you may perform folder.list() or you can use store.getDefaultFolder().list("*") to retrieve all the folders and sub-folders as suggested in the other answer.

Properties props = System.getProperties();
props.setProperty("mail.store.protocol", "imaps");
Session session = Session.getDefaultInstance(props, null);
Store store = session.getStore("imaps");
store.connect("imap.gmail.com", "YOURMAILID@gmail.com", "UR_P@ZZWRD");
System.out.println(store);

Folder[] f = store.getDefaultFolder().list();
for(Folder fd:f)
    System.out.println(">> "+fd.getName());

Output:

>> INBOX
>> Personal
>> Receipts
>> Travel
>> Work
>> [Gmail]

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OLD ANSWER

Please note this is not correct, it's rightly pointed in this answer by dkarp

These should do:

http://java.sun.com/products/javamail/javadocs/javax/mail/Store.html#getSharedNamespaces%28%29

http://java.sun.com/products/javamail/javadocs/javax/mail/Store.html#getUserNamespaces%28java.lang.String%29