Hi there,
My scenario is the following:
Fetch email on POP3 every 10 seconds. If email, split into separate Message for every attachment. Save attachment locally.
I'm using the following recommendation from CAMEL:
Consuming mails with attachment sample
In this sample we poll a mailbox and store all attachments from the mails as files. First, we define a route to poll the mailbox. As this sample is based on google mail, it uses the same route as shown in the SSL sample:
from("imaps://imap.gmail.com?username=YOUR_USERNAME@gmail.com&password=YOUR_PASSWORD" + "&delete=false&unseen=true&consumer.delay=60000").process(new MyMailProcessor());
Instead of logging the mail we use a processor where we can process the mail from java code:
public void process(Exchange exchange) throws Exception { // the API is a bit clunky so we need to loop Map<String, DataHandler> attachments = exchange.getIn().getAttachments(); if (attachments.size() > 0) { for (String name : attachments.keySet()) { DataHandler dh = attachments.get(name); // get the file name String filename = dh.getName(); // get the content and convert it to byte[] byte[] data = exchange.getContext().getTypeConverter() .convertTo(byte[].class, dh.getInputStream()); // write the data to a file FileOutputStream out = new FileOutputStream(filename); out.write(data); out.flush(); out.close(); } } }
As you can see the API to handle attachments is a bit clunky but it's there so you can get the javax.activation.DataHandler so you can handle the attachments using standard API.
How to split a mail message with attachments
In this example we consume mail messages which may have a number of attachments. What we want to do is to use the Splitter EIP per individual attachment, to process the attachments separately. For example if the mail message has 5 attachments, we want the Splitter to process five messages, each having a single attachment. To do this we need to provide a custom Expression to the Splitter where we provide a List<Message> that contains the five messages with the single attachment.
The code is provided out of the box in Camel 2.10 onwards in the camel-mail component. The code is in the class: org.apache.camel.component.mail.SplitAttachmentsExpression, which you can find the source code here
In the Camel route you then need to use this Expression in the route as shown below:{snippet:id=e1|lang=java|url=camel/trunk/components/camel-mail/src/test/java/org/apache/camel/component/mail/MailSplitAttachmentsTest.java}If you use XML DSL then you need to declare a method call expression in the Splitter as shown below
xml<split> <method beanType="org.apache.camel.component.mail.SplitAttachmentsExpression"/> <to uri="mock:split"/> </split>
From Camel 2.16 onwards you can also split the attachments as byte[] to be stored as the message body. This is done by creating the expression with boolean true
SplitAttachmentsExpression split = SplitAttachmentsExpression(true);
And then use the expression with the splitter eip.
Putting the code in my cProcessor make my route unusable (Java Error). Does anyone already do this on his system? I don't want to make a job, really want a route.
Thanks for your help,
-Jacob
