SSH-BOS project: use quartz to send mail regularly

step:

    1. Guide package (bos-parent --> pom.xml)

		<!-- Introduce quartz dependency -->
		<dependency>
			<groupId>org.quartz-scheduler</groupId>
			<artifactId>quartz</artifactId>
			<version>2.2.3</version>
		</dependency>
		<dependency>
			<groupId>org.quartz-scheduler</groupId>
			<artifactId>quartz-jobs</artifactId>
			<version>2.2.3</version>
		</dependency>
		<!-- Introduce java-mail dependency-->
		<dependency>
		    <groupId>javax.mail</groupId>
		    <artifactId>mail</artifactId>
		    <version>1.4.7</version>
		</dependency>

    2. Create a job class for sending emails

package cn.itcast.bos.quartz.jobs;

import java.util.List;
import java.util.Properties;

import javax.annotation.Resource;
import javax.mail.Authenticator;
import javax.mail.Message.RecipientType;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

import com.xushuai.bos.dao.WorkbillDao;
import com.xushuai.bos.entity.Workbill;

/**
 * Jobs to send emails
 * @author zhaoqx
 *
 */
public class MailJob {
	@Resource
	private WorkbillDao workbillDao;

	private String username;
	private String password;
	private String smtpServer;

	public String getUsername() {
		return username;
	}

	public void setUsername(String username) {
		this.username = username;
	}

	public String getPassword() {
		return password;
	}

	public void setPassword(String password) {
		this.password = password;
	}

	public void execute() {
		System.out.println("I'm going to send an email...");
		try {
			//Query all work orders whose work order type is new
			List<Workbill> list = workbillDao.findNewWorkbills();
			if(null != list && list.size() > 0){
				final Properties mailProps = new Properties();
				mailProps.put("mail.smtp.host", this.getSmtpServer());
				mailProps.put("mail.smtp.auth", "true");
				mailProps.put("mail.username", this.getUsername());
				mailProps.put("mail.password", this.getPassword());

				// Build authorization information for SMTP authentication
				Authenticator authenticator = new Authenticator() {
					protected PasswordAuthentication getPasswordAuthentication() {
						// Username Password
						String userName = mailProps.getProperty("mail.username");
						String password = mailProps.getProperty("mail.password");
						return new PasswordAuthentication(userName, password);
					}
				};
				// Create a mail session using environment properties and authorization information
				Session mailSession = Session.getInstance(mailProps, authenticator);
				for(Workbill workbill : list){
					// create email message
					MimeMessage message = new MimeMessage(mailSession);
					// set sender
					InternetAddress from = new InternetAddress(mailProps.getProperty("mail.username"));
					message.setFrom(from);
					// set recipient
					InternetAddress to = new InternetAddress("[email protected]");//You need to fill in the specific recipient email
					message.setRecipient(RecipientType.TO, to);
					// set the email header
					message.setSubject("System Mail: New Order Notification");
					// Set the body of the email
					message.setContent(workbill.toString(), "text/html;charset=UTF-8");
					// send email
					Transport.send(message);
				}
			}
		} catch (Exception ex) {
			ex.printStackTrace();
		}
	}

	public String getSmtpServer() {
		return smtpServer;
	}

	public void setSmtpServer(String smtpServer) {
		this.smtpServer = smtpServer;
	}
}

3. Configure the spring configuration file (new configuration):

	<!-- Configure custom work class -->
	<bean id="myJob" class="cn.itcast.bos.quartz.jobs.MailJob">
		<property name="username" value="xxxxxxxxxxxx"/>
		<property name="password" value="xxxxxxxxxxxxxx"/>
		<property name="smtpServer" value="smtp.163.com"/>
	</bean>
	
	<!-- Configuration job details class: org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean -->
	<bean id="jobDetail" class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean">
		<!-- Inject custom work class -->
		<property name="targetObject" ref="myJob"/>
		<!-- The method of injecting the custom work class that needs to be performed -->
		<property name="targetMethod" value="execute"/>
	</bean>
	
	<!-- Configure triggers: org.springframework.scheduling.quartz.CronTriggerFactoryBean -->
	<bean id="myTrigger" class="org.springframework.scheduling.quartz.CronTriggerFactoryBean">
		<!-- inject job details object -->
		<property name="jobDetail" ref="jobDetail"/>
		<!-- Inject Cron expression: cronExpression -->
		<property name="cronExpression" value="0 0/1 * * * ? *" />
	</bean>
	
	<!-- Configure scheduling factory: org.springframework.scheduling.quartz.SchedulerFactoryBean -->
	<bean id="schedulerFactoryBean" class="org.springframework.scheduling.quartz.SchedulerFactoryBean">
		<!-- inject trigger -->
		<property name="triggers" >
			<list>
				<ref bean="myTrigger"/>
			</list>
		</property>
	</bean>

WorkbillDao new method:

	/**
	 * Query work orders whose work order status is 'new order'
	 * @return
	 */
	List<Workbill> findNewWorkbills();

Dao layer implementation:

	@Override
	public List<Workbill> findNewWorkbills() {
		String hql = "FROM Workbill WHERE type = '"+Workbill.TYPE_NEW+"'";
		return (List<Workbill>) this.getHibernateTemplate().find(hql);
	}

Note: Sending emails is not required by the system, just to practice quartz. In addition, remove the associated attribute in the toString() method of Workbill, otherwise there will be a no session exception. Problems caused by lazy loading.