如何使用POP3检索Gmail子文件夹/标签? [英] How to retrieve gmail sub-folders/labels using POP3?

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问题描述

以下代码使用javamail API访问gmail,


int port = 995;
属性properties = new Properties();
properties.put(mail.smtp.socketFactory.class,javax.net.ssl.SSLSocketFactory);

final javax.mail.Session session = javax.mail.Session.getInstance(properties);
store = session.getStore(pop3s);
store.connect(主机,端口,mCredentialaNme,mCredentialApss);

// **************************************** ***********************
文件夹personalFolders [] = store.getDefaultFolder()。list(*);
// ******************************************** *******************
(文件夹对象:personalFolders){
// ************* **********************
System.out.println(object.list(*));
// ***********************************
if((object。 getType()& javax.mail.Folder.HOLDS_MESSAGES)!= 0){
object.open(Folder.READ_ONLY);
消息messes [] = object.getMessages();

System.out.println(object.getFullName());
System.out.println(====================); (Message object1:messes)
{
System.out.println(object1.getFrom()+ - + object1.getSubject());
}
object.close(false); ()。
}
}

if(store.isConnected()){
store.close();
}

麻烦的是,此代码只列出了INBOX文件夹,而没有更少定义了超过20个标签。
应该做些什么才能让代码列出/访问这些嵌套的文件夹/标签?

解决方案

不要使用POP,如果您想要标签/文件夹,请使用IMAP。



javamail docs ,由于POP协议的性质,POP消息存储始终是


只包含一个文件夹,INBOX。



The code below uses javamail API to access gmail,

    String host = "pop.gmail.com";
    int port = 995;
    Properties properties = new Properties();
    properties.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");

    final javax.mail.Session session = javax.mail.Session.getInstance(properties);
    store = session.getStore("pop3s");
    store.connect(host, port, mCredentialaNme, mCredentialApss);

// ***************************************************************
Folder personalFolders[] = store.getDefaultFolder().list( "*" );
    // ***************************************************************
    for (Folder object : personalFolders) {
        // ***********************************
        System.out.println( object.list("*") );    
        // ***********************************
        if ((object.getType() & javax.mail.Folder.HOLDS_MESSAGES) != 0){
            object.open(Folder.READ_ONLY);
            Message messes[] = object.getMessages();

            System.out.println(object.getFullName());
            System.out.println("====================");
            for (Message object1 : messes) {
                System.out.println(object1.getFrom() + " - " + object1.getSubject());
            }
            object.close(false);
        }
    }

if (store.isConnected()) {
        store.close();
    }

The trouble is that this code only lists the INBOX folder whereas there are no less than 20 labels defined. What should be done to get the code to list/access these nested folders/labels?

解决方案

Don't use POP, use IMAP if you want labels/folders.

As noted in the javamail docs, due to the nature of the POP protocol, a POP message store always

Contains only one folder, "INBOX".

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