Spring，Quartz和JavaMail集成教程

Quartz是一個作業調度框架，用于調度要在指定的時間表上執行的作業。JavaMail是一個用于從Java應用程序發送/接收電子郵件的API。

Spring具有集成點，可以集成Quartz和JavaMail，從而使這些API易于使用。讓我們創建一個小型演示應用程序，以展示如何集成Spring + Quartz + JavaMail。

我們的應用程序是每天早上6點向朋友發送生日祝福電子郵件。

Email.java

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

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

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 messageboolean 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

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;}@Overrideprotected 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

<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

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"); }}

參考：我的JCG合作伙伴 Siva的“ Spring + Quartz + JavaMail集成教程” ，在My Experiments on Technology博客上。

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