Kettle使用Java代码发送会议邀约

这段时间通过kettle完成了一个产品到期提醒的功能，也就是通过发送会议邀约的方式实现定时提醒。由于kettle自带有发送邮件的组件，但并没有发送会议邀约的组件，所以只能通过Java代码组件来进行自行开发实现。而在实现这个的过程中，我踩了一些小坑，在此做个小总结，便于后期回顾，也期待能够借此帮助到他人。

首先介绍下分享流程：1. 了解使用java代码发送会议邀约的流程；2. 介绍通过kettle的java代码组件发送会议邀约的方式。说明：本次分享主要是针对outlook邮箱和foxmail邮箱，其他邮箱我并没有测试，想必效果应该也都是差不多的。

1.java代码发送会议邀约

代码很详细，注释也很清楚，下面直接上代码。
pom.xml依赖:

        <dependency>
            <groupId>javax.mail</groupId>
            <artifactId>mail</artifactId>
            <version>1.4.7</version>
        </dependency>

code代码:

import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.*;
import javax.mail.internet.*;
import javax.mail.util.ByteArrayDataSource;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.*;

public class Email {
    public void send(String fromEmail, String toEmail, String emailPort, String emailHost, String valarmDt, String subject, String location, String emailContent) {
        try {
            Properties props = new Properties();
            props.put("mail.smtp.port", emailPort);
            props.put("mail.smtp.host", emailHost);
            props.put("mail.transport.protocol", "smtp");
            props.put("mail.smtp.auth", "true");
            props.put("mail.smtp.starttls.enable", "true");
            props.put("mail.smtp.ssl", "true");

            Authenticator authenticator = new Authenticator() {
                @Override
                protected PasswordAuthentication getPasswordAuthentication() {
                    String userId = "faJianRen@YouXiang.DiZhi";
                    String password = "PassWord";
                    return new PasswordAuthentication(userId, password);
                }
            };
            Session session = Session.getInstance(props, authenticator);
            MimeMessage message = new MimeMessage(session);
            message.setFrom(new InternetAddress(fromEmail));
            /*
                设置多收件人，Message.RecipientType.CC:密送
                            Message.RecipientType.BCC:抄送
                            Message.RecipientType.TO：收件人
             */
            List<String> emails = new ArrayList<>();
            String[] emailArrays = toEmail.split(" ");
            int a = emailArrays.length;
            for (String email : emailArrays) {
                emails.add(email);
            }
            message.addRecipients(Message.RecipientType.TO, setRecipientT0(emails));
            message.setSubject(subject);
            StringBuffer buffer = new StringBuffer();
            buffer.append("BEGIN:VCALENDAR\n"
                    + "PRODID:-//Microsoft Corporation//Outlook 9.0 MIMEDIR//EN\n"
                    + "VERSION:2.0\n"
                    + "METHOD:REQUEST\n"  //METHOD:CANCEL 取消会议  METHOD:REQUEST 创建和更新会议
                    + "BEGIN:VEVENT\n"
                    + "ATTENDEE;ROLE=REQ-PARTICIPANT;RSVP=TRUE:MAILTO:" + toEmail + "\n"
                    + "ORGANIZER:MAILTO:" + toEmail + "\n"
                    + "DTSTART:" + getUtc(valarmDt + " 08:00") + "\n"
                    + "DTEND:" + getUtc(valarmDt + " 19:00") + "\n"
                    + "LOCATION:" + location + "\n"
                    + "UID:" + UUID.randomUUID().toString() + "\n"//如果id相同的话，outlook会认为是同一个会议请求，所以使用uuid。
                    + "CATEGORIES:待办提醒\n"
                    + "DESCRIPTION:" + emailContent + "\n\n"  // 会议内容换行为\\n
                    + "SUMMARY:汇总 \n" + "PRIORITY:5\n"
                    + "CLASS:PUBLIC\n" + "BEGIN:VALARM\n"
                    + "TRIGGER:-PT15M\n" + "ACTION:DISPLAY\n"
                    + "DESCRIPTION:Reminder\n" + "END:VALARM\n"
                    + "END:VEVENT\n" + "END:VCALENDAR");
            BodyPart messageBodyPart = new MimeBodyPart();
            // 测试下来如果不这么转换的话，会以纯文本的形式发送过去，
            //如果没有method=REQUEST;charset=\"UTF-8\"，outlook会议附件的形式存在，而不是直接打开就是一个会议请求
            messageBodyPart.setDataHandler(new DataHandler(new ByteArrayDataSource(buffer.toString(),
                    "text/calendar;method=REQUEST;charset=\"UTF-8\"")));
            Multipart multipart = new MimeMultipart();
            multipart.addBodyPart(messageBodyPart);

            // 添加附件
            String[] paths = { "D:\\log\\2020-6-30.log", "D:\\log\\2020-7-1.log" };
            for (String filePath : paths) {
                MimeBodyPart part = new MimeBodyPart();
                FileDataSource fds = new FileDataSource(filePath);
                part.setFileName(MimeUtility.encodeWord(fds.getName()));// MimeUtility.encodeWord文件名解决中文乱码
                part.setDataHandler(new DataHandler(fds));
                multipart.addBodyPart(part);
            }

            message.setContent(multipart);
            Transport.send(message);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

    /*** 设置收件人/抄送人/密送人地址信息*/
    private InternetAddress[] setRecipientT0(List<String> recipientT0List) throws Exception {
        if (recipientT0List.size() > 0) {
            InternetAddress[] sendTo = new InternetAddress[recipientT0List.size()];
            for (int i = 0; i < recipientT0List.size(); i++) {
                System.out.println("发送到:" + recipientT0List.get(i));
                sendTo[i] = new InternetAddress(recipientT0List.get(i), "", "UTF-8");
            }
            return sendTo;
        }
        return null;
    }

    /**
     * 转utc时间
     */
    private static String getUtc(String str) throws Exception {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd HH:mm");
        long millionSeconds = 0;
        millionSeconds = sdf.parse(str).getTime();
        //utc时间差8小时
        long currentTime = millionSeconds - 8 * 60 * 60 * 1000;
        Date date = new Date(currentTime);
        DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        String nowTime = df.format(date);
        String utcTime = nowTime.replace("-", "").replace(" ", "T").replace(":", "");
        return utcTime;
    }

    public static void main(String[] args) {
        try {
            Email email = new Email();
            String fromEmail = "faJianRen@YouXiang.DiZhi";
            String toEmail = "XIAGUANGHUI@houzhui.com";
            String emailPort = "25";
            String emailHost = "10.8.88.88";
            String valarmDt = "20200910";
            String subject = "subject产品到期提醒20200909";
            String location = "1号会议室（此处完全可以写成自定义的内容，不必拘泥于会议邀约）";
            String emailContent = "2020-0001|产品1|2020-08-30|200000.00|固定分配|李飞\\n" +
                    "2020-0002|产品2|2020-08-30|200000.00|固定分配2|李飞2";

            email.send(fromEmail, toEmail, emailPort, emailHost, valarmDt, subject, location, emailContent);
            System.out.println("success");
            System.out.println(System.currentTimeMillis());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

效果展示（outlook邮箱）：

outlook会议邀约效果展示

2.使用kettle java代码组件发送会议邀约

说明：我的kettle版本8.2，在开发前，需copy到依赖的jar包到kettle\data-integration\lib目录下，依赖jar包分别为javaws.jar、javax.mail.jar、rt.jar。

kettle

java代码：

// 导入依赖jar
import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.*;
import javax.mail.internet.*;
import javax.mail.util.ByteArrayDataSource;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.*;

    public boolean processRow(StepMetaInterface smi, StepDataInterface sdi)  throws Exception {
        Object[] r = getRow();
        if (r == null) {
            setOutputDone();
            return false;
        }
        String haha;
        if (first) {
            first = false;
        }
        Object[] outputRow = createOutputRow(r, data.outputRowMeta.size());


        String fromEmail = "faJianRen@YouXiang.DiZhi";
        String toEmail = getParameter("toEmail");
        String valarmDt = getParameter("valarmDt");
        String emailContent = null;
        String dqCount = getParameter("DQCOUNT");
        int count = Integer.parseInt(dqCount);
        if(count > 20){
            emailContent = valarmDt+"存在" + dqCount + "个产品项目到期，具体详情请查看附件！";
        }else{
            emailContent = "产品到期列表如下：\\n" + get(Fields.In, "content_dqtx").getString(r);
        }

        String result = send(fromEmail, toEmail, valarmDt, emailContent);
        //get(Fields.Out, "RESULTMSG").setValue(outputRow, result); //输出参数
        putRow(data.outputRowMeta, outputRow);
        return true;
    }
    private class EmailAuthenticator extends Authenticator {
        protected PasswordAuthentication getPasswordAuthentication() {
            String userId = "faJianRen@YouXiang.DiZhi";
            String password = "PASSWORD";
            return new PasswordAuthentication(userId, password);
        }
    }

    public String send(String fromEmail, String toEmail, String valarmDt, String emailContent) {
        try {
            Properties props = new Properties();
            try {
                props.put("mail.smtp.port", "25");
                props.put("mail.smtp.host", "10.8.88.88");
                props.put("mail.transport.protocol", "smtp");
                props.put("mail.smtp.auth", "true");
                props.put("mail.smtp.starttls.enable", "true");
                props.put("mail.smtp.ssl", "true");
            } catch (Exception e) {
                e.printStackTrace();
                return "-1";
            }

            Session session;
            Authenticator authenticator = new EmailAuthenticator();
            session = Session.getInstance(props, authenticator);
            MimeMessage message = new MimeMessage(session);
            message.setFrom(new InternetAddress(fromEmail));
            //message.addRecipient(Message.RecipientType.TO, new InternetAddress(toEmail));

            List emails = new ArrayList();
            String[] emailArrays = toEmail.split(" ");
            for (int i = 0; i < emailArrays.length; i++) {
                emails.add(emailArrays[i]);
            }

            message.addRecipients(Message.RecipientType.TO,setRecipientT0(emails));
            message.setSubject("产品到期提醒");
            StringBuffer buffer = new StringBuffer();
            buffer.append("BEGIN:VCALENDAR\n"
                    + "PRODID:-//Microsoft Corporation//Outlook 9.0 MIMEDIR//EN\n"
                    + "VERSION:2.0\n"
                    + "METHOD:REQUEST\n"
                    + "BEGIN:VEVENT\n"
                    + "ATTENDEE;ROLE=REQ-PARTICIPANT;RSVP=TRUE:MAILTO:" + toEmail + "\n"
                    + "ORGANIZER:MAILTO:" + toEmail + "\n"
                    + "DTSTART:" + getUtc(valarmDt + " 09:00") + "\n"
                    + "DTEND:" + getUtc(valarmDt + " 09:30") + "\n"
                    + "LOCATION:到期提醒\n"
                    + "UID:" + UUID.randomUUID().toString() + "\n"//如果id相同的话，outlook会认为是同一个会议请求，所以使用uuid。
                    + "CATEGORIES:待办提醒\n"
                    + "DESCRIPTION:" + emailContent + "\n\n"
                    + "SUMMARY:产品到期提醒\n" + "PRIORITY:5\n"
                    + "CLASS:PUBLIC\n" + "BEGIN:VALARM\n"
                    + "TRIGGER:-PT15M\n" + "ACTION:DISPLAY\n"
                    + "DESCRIPTION:Reminder\n" + "END:VALARM\n"
                    + "END:VEVENT\n" + "END:VCALENDAR");
            BodyPart messageBodyPart = new MimeBodyPart();
            // 测试下来如果不这么转换的话，会以纯文本的形式发送过去，
            //如果没有method=REQUEST;charset=\"UTF-8\"，outlook会议附件的形式存在，而不是直接打开就是一个会议请求
            messageBodyPart.setDataHandler(new DataHandler(new ByteArrayDataSource(buffer.toString(),
                    "text/calendar;method=REQUEST;charset=\"UTF-8\"")));
            Multipart multipart = new MimeMultipart();
            multipart.addBodyPart(messageBodyPart);

            MimeBodyPart part = new MimeBodyPart();
            FileDataSource fds = new FileDataSource("D:\\upload\\kettle_job\\\product_dqfp_rili_tixing\\产品到期项目列表.xls");
            part.setFileName(MimeUtility.encodeWord(fds.getName()));// MimeUtility.encodeWord文件名解决中文乱码
            part.setDataHandler(new DataHandler(fds));
            multipart.addBodyPart(part);

            message.setContent(multipart);
            Transport.send(message);
        } catch (MessagingException me) {
            me.printStackTrace();
            return me.getMessage();
        } catch (Exception ex) {
            ex.printStackTrace();
            return "-3";
        }
        return "Success";
    }


    private InternetAddress[] setRecipientT0(List recipientT0List) throws Exception {
        if (recipientT0List.size() > 0) {
            InternetAddress[] sendTo = new InternetAddress[recipientT0List.size()];
            for (int i = 0; i < recipientT0List.size(); i++) {
                System.out.println("发送到:" + recipientT0List.get(i));
                sendTo[i] = new InternetAddress(recipientT0List.get(i).toString(), "", "UTF-8");
            }
            return sendTo;
        }
        return null;
    }

    /**
     * 转utc时间
     */
    private static String getUtc(String str) {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd HH:mm");
        long millionSeconds = 0;
        try {
            millionSeconds = sdf.parse(str).getTime();
        } catch (ParseException e1) {
            e1.printStackTrace();
        }
        //utc时间差8小时
        long currentTime = millionSeconds - 8 * 60 * 60 * 1000;
        Date date = new Date(currentTime);
        DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        String nowTime = df.format(date);
        String utcTime = nowTime.replace("-", "").replace(" ", "T").replace(":", "");
        return utcTime;
    }

在使用kettle的java代码组件时，发现如下小坑，在此总结说明一下，以防后面开发重复踩坑:
(1) 不支持@override注解，故以上代码EmailAuthenticator，没有使用内部类的方式进行初始化；
(2) 无法识别泛型的尖括号<>，可以观察到，原本应该使用泛型的地方，都删除掉了泛型。

3.参考资料

https://blog.csdn.net/han949417140/article/details/90206475
https://www.cnblogs.com/lyxy/p/4568820.html
https://blog.csdn.net/zccbbg/article/details/84162162