iCal4j解析来自ICS的会议请求

Question

I want to parse ics files received from an Exchange using iCal4j to create a VEvent for local processing, and modify them to create a new time proposal ( COUNTER method) for sending them back to the Exchange. The problem is that I was only able to build Calendar objects (see the code below), no VEvent .

File file = new File(PATH);
CalendarBuilder builder = new CalendarBuilder();
net.fortuna.ical4j.model.Calendar cal = null;
try {
    FileInputStream fis = new FileInputStream(file);
    cal = builder.build(fis);
} catch (Exception e) {
    e.printStackTrace();
}

Most probably, I would be able to create the replies from scratch, but if I could create them from the invite directly, I guess the result would be more likely to work. Also, I really would like to avoid parsing the files manually and hack around with string matching and things like that.

Answer 1

It seems that the solution is rather simple, it is just not detailed in the examples of iCal4j, where I was looking for help. (Sorry, I am a novice programmer). But after looking into the API reference of iCal4j , I found the following:

If you parse an ics file to a Calendar object, it will have only a few Properties , like METHOD , PRODID and VERSION in our case. But it might (and most probably will) have some Components too, like VEvent , VTodo , etc, which is the actual content of the ics file. You can get the Components' list with

ComponentList cl = cal.getComponents();

For us, parsing, modifying and sending them will be much easier than creating them from scratch.