How to create daily or weekly calendar events in Outlook with Java code?

Java code implementation for creating duplicate calendar events in Outlook

This article describes how to create daily or weekly repeat calendar events in Outlook using Java code. Many existing code can only create a single event, but cannot achieve duplication. This article will analyze the causes and provide solutions.

The problem is usually the lack of RRULE attribute in the iCalendar standard. This property defines the repetition rule, which controls the frequency, number of repetitions, and end dates of events.

In order to create duplicate events, you need to add the RRULE attribute in the iCalendar data. The following code example shows how to create daily and weekly repetitive events:

 StringBuilder eventData = new StringBuilder();
// ... (Other codes remain unchanged) ...
eventData.append("BEGIN:VEVENT\n");
// ... (Other codes remain unchanged) ...

// Repeat eventData.append("RRULE:FREQ=DAILY;COUNT=10\n");

// Or, repeat weekly until January 1, 2024, only on Monday, Wednesday, and Friday // eventData.append("RRULE:FREQ=WEEKLY;UNTIL=20240101T000000Z;BYDAY=MO,WE,FR\n");

// ... (Other codes remain unchanged) ...

RRULE:FREQ=DAILY;COUNT=10 means that the event is repeated 10 times a day. RRULE:FREQ=WEEKLY;UNTIL=20240101T000000Z;BYDAY=MO,WE,FR means that the event is repeated every week until January 1, 2024, and only on Monday, Wednesday and Friday. UNTIL attribute specifies the end date, and BYDAY attribute specifies the specific date that is repeated every week (MO=Monday, TU=Tuesday, and so on). Please adjust the values ​​of COUNT , UNTIL and BYDAY according to actual needs.

RRULE attribute syntax is relatively complex. It is recommended to refer to the iCalendar specification document for all options and usage. Ensure that the Outlook client can correctly parse the generated iCalendar file. If you still cannot create duplicate events, check for errors during the mailing process and the calendar settings of Outlook.

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