Java生成ics文件

生成ics文件可以使用Java iCalendar API库，以下是一个示例代码：

import java.io.FileOutputStream;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

import net.fortuna.ical4j.data.CalendarOutputter;
import net.fortuna.ical4j.model.Calendar;
import net.fortuna.ical4j.model.DateTime;
import net.fortuna.ical4j.model.TimeZone;
import net.fortuna.ical4j.model.TimeZoneRegistryFactory;
import net.fortuna.ical4j.model.component.VEvent;
import net.fortuna.ical4j.model.property.CalScale;
import net.fortuna.ical4j.model.property.Description;
import net.fortuna.ical4j.model.property.Location;
import net.fortuna.ical4j.model.property.Method;
import net.fortuna.ical4j.model.property.Organizer;
import net.fortuna.ical4j.model.property.ProdId;
import net.fortuna.ical4j.model.property.Uid;
import net.fortuna.ical4j.model.property.Version;

public class IcsGenerator {

    public static void main(String[] args) throws Exception {
        // Create a TimeZone
        TimeZoneRegistry registry = TimeZoneRegistryFactory.getInstance().createRegistry();
        TimeZone timezone = registry.getTimeZone("America/New_York");

        // Start Date is on: April 24, 2018, 10:00 am
        java.util.Calendar startDate = java.util.Calendar.getInstance();
        startDate.set(java.util.Calendar.MONTH, java.util.Calendar.APRIL);
        startDate.set(java.util.Calendar.DAY_OF_MONTH, 24);
        startDate.set(java.util.Calendar.YEAR, 2018);
        startDate.set(java.util.Calendar.HOUR_OF_DAY, 10);
        startDate.set(java.util.Calendar.MINUTE, 0);
        startDate.set(java.util.Calendar.SECOND, 0);

        // End Date is on: April 24, 2018, 11:00 am
        java.util.Calendar endDate = java.util.Calendar.getInstance();
        endDate.set(java.util.Calendar.MONTH, java.util.Calendar.APRIL);
        endDate.set(java.util.Calendar.DAY_OF_MONTH, 24);
        endDate.set(java.util.Calendar.YEAR, 2018);
        endDate.set(java.util.Calendar.HOUR_OF_DAY, 11);
        endDate.set(java.util.Calendar.MINUTE, 0);
        endDate.set(java.util.Calendar.SECOND, 0);

        // Create the event
        String eventName = "Status Meeting";
        String location = "Meeting room";
        String description = "Discussing the status of the current project";

        DateTime start = new DateTime(startDate.getTime());
        start.setTimeZone(timezone);

        DateTime end = new DateTime(endDate.getTime());
        end.setTimeZone(timezone);

        VEvent meeting = new VEvent(start, end, eventName);

        // add timezone info..
        meeting.getProperties().add(new net.fortuna.ical4j.model.property.Location(location));
        meeting.getProperties().add(new Description(description));

        // generate unique identifier..
        UidGenerator ug = new UidGenerator("uidGen");
        Uid uid = ug.generateUid();
        meeting.getProperties().add(uid);

        // Add the event and print
        net.fortuna.ical4j.model.Calendar icsCalendar = new net.fortuna.ical4j.model.Calendar();
        icsCalendar.getProperties().add(new ProdId("-//Ben Fortuna//iCal4j 1.0//EN"));
        icsCalendar.getProperties().add(Version.VERSION_2_0);
        icsCalendar.getProperties().add(CalScale.GREGORIAN);

        icsCalendar.getComponents().add(meeting);

        // Saving an iCalendar file
        String fileName = "status-meeting.ics";
        FileOutputStream fout = new FileOutputStream(fileName);

        CalendarOutputter outputter = new CalendarOutputter();
        outputter.setValidating(false);
        outputter.output(icsCalendar, fout);

        System.out.println("iCalendar file created at: " + new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()));
    }
}

这个示例代码创建一个名为“Status Meeting”的事件，将其保存到ics文件中。你可以自定义事件的开始时间、结束时间、名称、位置和描述。在示例代码中，iCalendar文件名为“status-meeting.ics”，并保存在工作目录中。你可以根据自己的需求更改文件名和保存路径。