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I'm looking for a library that wraps the javamail API on the receiving side, in the same manner that Commons Email handles the sending of emails.
In my perfect world the library works in the following manner:
Subscribe to a mail server
Notify me when an email arrives
Handle attachments for me (why should I care about base64 encoding?)
Disconnect from the mail server
Anybody know of a mail library/API that does the above?
You may look at Jodd Email: https://jodd.org/email/ (see: 'Receiving emails'). Besides for sending emails, it also wraps javamail API for receiving emails. So you can do:
Connect to a pop3 (plan and ssl) mail server
Receive emails manually
Process all received emails using simple API; including multiple messages, attachments, contentIds etc.
Disconnect from mail server
As you see, you have to receive emails manually, so it will not notify your code out-of-box (your point #2). This is done on purpose, as there are many ways how your code can be notified and how received email can be monitored. Most of this is really easy to implement or depends on the rest of your application architecture/used libraries.
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I am trying to understand how to create reactive UIs using angular 2 and java rest service.
What I am trying to achieve -
Consider a simple single page to-do application.
Multiple users open this same UI, and every one's UI is updated as soon as any one of user add/updates/deletes a to do list item, without having to do any manual refresh or other action.
I searched how one would go about implementing this and mostly found results around RxJS and RxJava. I understood the concept of observables. But what I don't understand is how would the UI subscribe to server data changes. If what I am trying to achieve is not achievable with above mentioned technologies, I am open for any other options, but my server has to be Java based.
If you could provide a working example / exact libraries / links that would be of great help.
Thanks
If you want to communicate from a java backend server in a realtime manner with your frontend applications, you can do this through sockets. A popular library to do this is using 'socket.io': http://socket.io/.
At startup/login time in your frontend you could open a socket to connect to the backend. Every time a change is made by a specific user, you could send a message over this socket from the java backend to your frontend.
If you are working with redux, you could even send a redux action from your backend to the frontend over the socket. In your socket listener in the frontend you could just dispatch that action to the store so your state is updated.
After a quick internet search I found this article which describes using socket.io (there's a java connector for socket io as well) and redux: http://spraso.com/real-time-data-flow-with-redux-and-socket-io/
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I need to read email using a java application. I have Javamail samples from http://java.net/projects/javamail/downloads/download/javamail-samples.zip But how do i get the email server parameters from lotus notes which is configured on my system which i should use in Javamail program?
Javamail implements the protocols POP3, IMAP and SMTP. On a "normal" Domino- Server the only protocol that is started is SMTP and you can send mails using the fully qualified hostname of your Domino- Server.
But this will only work, if your administrator does not restrict access to SMTP.
Receiving mails will not be possible unless your Domino administrator loads and configures the tasks "POP3" and / or "IMAP".
Most admins wont do that, as these protocols are not necessary for the normal use of a domino server where the communication with the clients goes over protocol NRPC (Port 1352), a proprietary protocol by IBM.
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I am trying to make connection between my Python3 local LAN server script and my Android device. While testing i am using Android Virtual Device Manager. Main target is to keep connection between server and clients for a long time (1 hour).
Is there any good library to send and receive packets for an Android and to make things easier? Phone must work as a client which can send and receive data from server.
P.S. Im targeting API 15.
I only managed to send packets to Python and print them in console. I was using PrintWriter class to send data and java.net.Socket class to open a socket. Tried to read incoming data but there was a lot of errors.
Volley is a very good library for making asynchronous HTTP requests on Android.
Kryonet is another very good Java network library for sending TCP and UDP packets over network efficiently which runs on Android as well. Though whenever I used Kryonet, I wrote both the server side code and client side code using this library. Kryonet keeps the connection alive though, so if you don't have any issues changing your server side code from Python to Java (Kryonet has samples which you can use), then it will serve your purpose well.
Using this library, you don't even need to hardcode any IP address. You can discover the local server in real time with just one line of code.
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I want to use a mail server where the users send emails to it and then I parse this emails then do some action.
Please suggest me what mail server to be used and where to start.
You can also use JavaMail API to read a POP3/IMAP mailbox on your regular mail server. This makes it easier to use a mailbox in your regular domain. Camel packages these API's at a high level and makes it really easy to integrate with mailboxes, transform the message inside and send the results wherever they are needed.
Now if it are easy things you need to do then you can configure most mailservers to deliver mails to a script. This is REALLY easy but Java is not really suitable to write this script in because the startup cost of the JVM is too high. A simple batch script or perl/ruby/vbscript thingy could be all you need.
Are you saying you want to use Java to send a mail message to a mailbox configured on your mail server or to read from the mailbox and to process the message? So you just want to know of a mail server you can install on your local pc to test with? If that's the case and you are running on a Windows OS you can install hMailServer. If you are using Linux / Unix you can configure Postfix.
Apache James is a mail server written in Java that you could use.
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I want to make an application that can send an SMS to person in another country.
I have heard that using an international SMS gateway is the best way to do it, and is cheap (possibly even free).
What is the best library for achieving this?
There are a couple of options:
1) Use a java library such as smslib, which allows direct communication with a mobile phone modem to send or receive messages.
2) Register with one of the SMS gateway providers such as Clickatell or csoft and use their supplied apis. I would start by looking at the HTTP api here and here.
A number of similar previous questions have covered this topic:
Programmatic SMS
How do I implement an SMS service?
Sending SMS