parse outlook .ics file in java to fetch list of events with start date and end date

 iCalendar data files are plain text files with the extension .ics
 iCalendar data has the MIME content type text/calendar.

 Files with .ics extension which contain calendaring and scheduling information consistent with this MIME content type.

These calendar files allow different users to store calendar information within a text file .



Maven dependency

<dependency>
<groupId>org.mnode.ical4j</groupId>
<artifactId>ical4j</artifactId>
<version>1.0.4</version>
</dependency>

or can use

ical4j-1.0.4.jar




Program to Parse .ics file in java to fetch list of events with start date and  end date



import java.io.File;
import java.io.FileInputStream;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import net.fortuna.ical4j.data.CalendarBuilder;
import net.fortuna.ical4j.model.Component;
import net.fortuna.ical4j.model.Property;
import net.fortuna.ical4j.model.property.CalScale;
import net.fortuna.ical4j.model.property.ProdId;
import net.fortuna.ical4j.model.property.Version;

public class ParseIcsFile {

public static void main(String args[]) throws Exception {
ParseIcsFile cusr = new ParseIcsFile();
File file = new File("Rohan_Calendar.ics");
String result = cusr.getCalInfoFromIcs(file);
System.out.println(result);
}

public String getCalInfoFromIcs(File file) throws Exception {

net.fortuna.ical4j.model.Calendar calendar = new net.fortuna.ical4j.model.Calendar();
calendar.getProperties().add(
new ProdId("-//Ben Fortuna//iCal4j 1.0//EN"));
calendar.getProperties().add(Version.VERSION_2_0);
calendar.getProperties().add(CalScale.GREGORIAN);

FileInputStream fin = new FileInputStream(file);
CalendarBuilder builder = new CalendarBuilder();
calendar = builder.build(fin);
List result = new ArrayList<String>();

for (Iterator i = calendar.getComponents().iterator(); i.hasNext();) {
Map<String, String> calenderinfo = new HashMap<String, String>();
Component component = (Component) i.next();

for (Iterator j = component.getProperties().iterator(); j.hasNext();) {
try {
String startdate = null, enddate = null, event = null;
Property property = (Property) j.next();
if ("DTSTART".equals(property.getName())) {
startdate = property.getValue();
calenderinfo.put("startDate",
modifyDateLayoutOfIcs(startdate));
}
if ("DTEND".equals(property.getName())) {
enddate = property.getValue();
calenderinfo.put("endDate",
modifyDateLayoutOfIcs(enddate));
}
if ("SUMMARY".equals(property.getName())) {
event = property.getValue();
calenderinfo.put("event", event);
}

if (!calenderinfo.isEmpty()) {
if (calenderinfo.get("event") != null) {
result.add(calenderinfo);
}
}

} catch (Exception ex) {

}
}
}
return result.toString();
}

private String modifyDateLayoutOfIcs(String inputDate) {
try {

SimpleDateFormat inDateFormat = new SimpleDateFormat("yyyyMMdd");
java.util.Date fromDate = inDateFormat.parse(inputDate);

SimpleDateFormat outDateForm = new SimpleDateFormat("dd-MMM-yyyy");
return outDateForm.format(fromDate);
} catch (Exception e) {
return inputDate;
}

}

}