Статьи

Учебник по интеграции Spring, Quartz и JavaMail

Апрель 3, 2019
Кварц — это структура планирования заданий, которая используется для планирования заданий, выполняемых в указанное время. JavaMail — это API для отправки / получения сообщений электронной почты из приложений Java.

Spring имеет точки интеграции для интеграции Quartz и JavaMail, что упрощает использование этих API. Давайте создадим небольшое демонстрационное приложение, чтобы показать, как интегрировать Spring + Quartz + JavaMail.

Наше приложение — отправлять электронные письма с пожеланиями дня рождения друзьям каждый день в 6 утра.

Email.java

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package com.sivalabs.reminders;
  
import java.util.ArrayList;
import java.util.List;
  
public class Email
{
 private String from;
 private String[] to;
 private String[] cc;
 private String[] bcc;
 private String subject;
 private String text;
 private String mimeType;
 private List<Attachment> attachments = new ArrayList<Attachment>();
   
 public String getFrom()
 {
  return from;
 }
 public void setFrom(String from)
 {
  this.from = from;
 }
 public String[] getTo()
 {
  return to;
 }
 public void setTo(String... to)
 {
  this.to = to;
 }
 public String[] getCc()
 {
  return cc;
 }
 public void setCc(String... cc)
 {
  this.cc = cc;
 }
 public String[] getBcc()
 {
  return bcc;
 }
 public void setBcc(String... bcc)
 {
  this.bcc = bcc;
 }
 public String getSubject()
 {
  return subject;
 }
 public void setSubject(String subject)
 {
  this.subject = subject;
 }
 public String getText()
 {
  return text;
 }
 public void setText(String text)
 {
  this.text = text;
 }
 public String getMimeType()
 {
  return mimeType;
 }
 public void setMimeType(String mimeType)
 {
  this.mimeType = mimeType;
 }
 public List<Attachment> getAttachments()
 {
  return attachments;
 }
 public void addAttachments(List<Attachment> attachments)
 {
  this.attachments.addAll(attachments);
 }
 public void addAttachment(Attachment attachment)
 {
  this.attachments.add(attachment);
 }
 public void removeAttachment(int index)
 {
  this.attachments.remove(index);
 }
 public void removeAllAttachments()
 {
  this.attachments.clear();
 }
}

Attachment.java

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package com.sivalabs.reminders;
  
public class Attachment
{
 private byte[] data;
 private String filename;
 private String mimeType;
 private boolean inline;
   
 public Attachment()
 {
 }
   
 public Attachment(byte[] data, String filename, String mimeType)
 {
  this.data = data;
  this.filename = filename;
  this.mimeType = mimeType;
 }
 public Attachment(byte[] data, String filename, String mimeType, boolean inline)
 {
  this.data = data;
  this.filename = filename;
  this.mimeType = mimeType;
  this.inline = inline;
 }
 public byte[] getData()
 {
  return data;
 }
 public void setData(byte[] data)
 {
  this.data = data;
 }
 public String getFilename()
 {
  return filename;
 }
 public void setFilename(String filename)
 {
  this.filename = filename;
 }
  
 public String getMimeType()
 {
  return mimeType;
 }
  
 public void setMimeType(String mimeType)
 {
  this.mimeType = mimeType;
 }
  
 public boolean isInline()
 {
  return inline;
 }
  
 public void setInline(boolean inline)
 {
  this.inline = inline;
 }
   
}

EmailService.java

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package com.sivalabs.reminders;
  
import java.util.List;
  
import javax.activation.DataSource;
import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;
import javax.mail.util.ByteArrayDataSource;
  
import org.springframework.mail.javamail.JavaMailSenderImpl;
import org.springframework.mail.javamail.MimeMessageHelper;
  
public class EmailService
{
 private JavaMailSenderImpl mailSender = null;
 public void setMailSender(JavaMailSenderImpl mailSender)
 {
  this.mailSender = mailSender;
 }
   
 public void sendEmail(Email email) throws MessagingException {
  MimeMessage mimeMessage = mailSender.createMimeMessage();
  // use the true flag to indicate you need a multipart message
  boolean hasAttachments = (email.getAttachments()!=null &&
         email.getAttachments().size() > 0 );
  MimeMessageHelper helper = new MimeMessageHelper(mimeMessage, hasAttachments);
  helper.setTo(email.getTo());
  helper.setFrom(email.getFrom());
  helper.setSubject(email.getSubject());
  helper.setText(email.getText(), true);
    
  List<Attachment> attachments = email.getAttachments();
     if(attachments != null && attachments.size() > 0)
     {
      for (Attachment attachment : attachments)
      {
          String filename = attachment.getFilename() ;
          DataSource dataSource = new ByteArrayDataSource(attachment.getData(),
                 attachment.getMimeType());
          if(attachment.isInline())
          {
           helper.addInline(filename, dataSource);
          }else{
           helper.addAttachment(filename, dataSource);
          }
      }
     }
    
  mailSender.send(mimeMessage);
 }
}

BirthdayWisherJob.java

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package com.sivalabs.reminders;
  
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
  
import javax.mail.MessagingException;
  
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;
import org.springframework.core.io.ClassPathResource;
import org.springframework.scheduling.quartz.QuartzJobBean;
  
public class BirthdayWisherJob extends QuartzJobBean
{
   
 private EmailService emailService;
 public void setEmailService(EmailService emailService)
 {
  this.emailService = emailService;
 }
   
 @Override
 protected void executeInternal(JobExecutionContext context) throws JobExecutionException
 {
  System.out.println("Sending Birthday Wishes... ");
  List<User> usersBornToday = getUsersBornToday();
  for (User user : usersBornToday)
  {
   try
   {
    Email email = new Email();
    email.setFrom("admin@sivalabs.com");
    email.setSubject("Happy BirthDay");
    email.setTo(user.getEmail());
    email.setText("<h1>Dear "+user.getName()+
      ",Many Many Happy Returns of the day :-)</h1>");
       
    byte[] data = null;
    ClassPathResource img = new ClassPathResource("HBD.gif");
    InputStream inputStream = img.getInputStream();
    data = new byte[inputStream.available()];
    while((inputStream.read(data)!=-1));
     
    Attachment attachment = new Attachment(data, "HappyBirthDay",
      "image/gif", true);
    email.addAttachment(attachment);
     
    emailService.sendEmail(email);
   }
   catch (MessagingException e)
   {
    e.printStackTrace();
   }
   catch (Exception e)
   {
    e.printStackTrace();
   }
  }
 }
   
 private List<User> getUsersBornToday()
 {
  List<User> users = new ArrayList<User>();
  User user1 = new User("Siva Prasad", "sivaprasadreddy.k@gmail.com", new Date());
  users.add(user1);
  User user2 = new User("John", "abcd@gmail.com", new Date());
  users.add(user2);
  return users;
 }
}

applicationContext.xml

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<beans>
  
 <bean class="org.springframework.scheduling.quartz.SchedulerFactoryBean">
 <property name="triggers">
  <list>
   <ref bean="birthdayWisherCronTrigger" />
  </list>
 </property>
 </bean>
 <bean id="birthdayWisherCronTrigger" class="org.springframework.scheduling.quartz.CronTriggerBean">
  <property name="jobDetail" ref="birthdayWisherJob" />
  <!-- run every morning at 6 AM -->
  <property name="cronExpression" value="0/5 * * * * ?" />
 </bean>
  
 <bean name="birthdayWisherJob" class="org.springframework.scheduling.quartz.JobDetailBean">
  <property name="jobClass" value="com.sivalabs.reminders.BirthdayWisherJob" />
  <property name="jobDataAsMap">
   <map>
    <entry key="emailService" value-ref="emailService"></entry>
   </map>
  </property>
 </bean>
   
 <bean id="emailService" class="com.sivalabs.reminders.EmailService">
  <property name="mailSender" ref="mailSender"></property>
 </bean>
   
 <bean id="mailSender" class="org.springframework.mail.javamail.JavaMailSenderImpl">
  <property name="defaultEncoding" value="UTF-8"/>
  <property name="host" value="smtp.gmail.com" />
  <property name="port" value="465" />
  <property name="protocol" value="smtps" />
  <property name="username" value="admin@gmail.com"/>
  <property name="password" value="*****"/>
  <property name="javaMailProperties">
   <props>
    <prop key="mail.smtps.auth">true</prop>
    <prop key="mail.smtps.starttls.enable">true</prop>
    <prop key="mail.smtps.debug">true</prop>
   </props>
  </property>
 </bean>
   
</beans>

TestClient.java

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package com.sivalabs.reminders;
  
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
  
public class TestClient {
   
 public static void main(String[] args)
 {
  ApplicationContext ctx =
     new ClassPathXmlApplicationContext("applicationContext.xml");
 }
  
}

Ссылка: руководство по интеграции Spring + Quartz + JavaMail от нашего партнера по JCG Сивы в блоге « Мои эксперименты по технологии» .

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