我们系统存在大量发送邮件的需求，项目使用的是Spring框架而JavaMail也能很好的跟Spring进行集成，由于发送邮件最好还是使用异步进行发送，所以这里就采用线程池+JavaMail进行邮件发送，下面看具体代码实现：
Step1、引入JavaMail
<mail.version>1.4.7</mail.version>
<dependency><groupId>javax.mail</groupId><artifactId>mail</artifactId><version>${mail.version}</version>
</dependency> Step2、Spring配置文件中配置MailSender和线程池
<!--MailSender--><bean id="javaMailSender" class="org.springframework.mail.javamail.JavaMailSenderImpl"><property name="host" value="${email.host}"/><property name="username" value="${email.username}"/><property name="password" value="${email.password}"/><property name="javaMailProperties"><props><prop key="mail.smtp.auth">true</prop><prop key="mail.smtp.timeout">25000</prop><!--<prop key="mail.smtp.starttls.enable">true</prop><prop key="mail.smtp.socketFactory.class">javax.net.ssl.SSLSocketFactory</prop>--></props></property></bean><!--配置线程池--><bean id="taskExecutor" class="org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor"><!-- 核心线程数 --><property name="corePoolSize" value="${executor.corePoolSize}" /><!-- 最大线程数 --><property name="maxPoolSize" value="${executor.maxPoolSize}" /><!-- 最大队列数 --><property name="queueCapacity" value="${executor.queueCapacity}" /><!-- 线程池维护线程所允许的空闲时间 --><property name="keepAliveSeconds" value="${executor.keepAliveSeconds}" /></bean>
Step3、新建邮件实体类，方便业务处理
import org.apache.commons.lang3.ArrayUtils; import org.apache.commons.lang3.StringUtils; import org.springframework.util.Assert;import javax.mail.internet.AddressException; import java.util.Arrays;/*** <p>* <code>MailEntry</code>* </p>* Description:* 邮件实体类* @author jianzh5* @version 2017/3/31 17:00* @since 1.0*/ public class MailEntry {/*** 收件人*/private String[] recipients;/*** 抄送人*/private String[] carbonCopy;/*** 主题*/private String subject;/*** 内容*/private String text;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[] getRecipients() {return recipients.clone();}public void setRecipients(String[] recipients) throws AddressException {Assert.isTrue(ArrayUtils.isNotEmpty(recipients),"收件人不能为空");String[] addresses = new String[recipients.length];for (int i = 0; i < addresses.length; i++) {addresses[i] = parseAddress(recipients[i]);}this.recipients = addresses;}public String[] getCarbonCopy() {if(ArrayUtils.isNotEmpty(carbonCopy)){return carbonCopy.clone();}return ArrayUtils.EMPTY_STRING_ARRAY;}public void setCarbonCopy(String[] carbonCopy) throws AddressException {String[] addresses = new String[carbonCopy.length];for (int i = 0; i < addresses.length; i++) {addresses[i] = parseAddress(carbonCopy[i]);}this.carbonCopy = addresses;}/*** @desc 只要设定邮件接受人的域账号即可自动增加企业后缀* @author jianzh5* @date 2017/4/1 13:43* @param recipient 收件人域账号* @return 带企业后缀的邮箱地址* @throws AddressException*/private String parseAddress(String recipient) throws AddressException {if(StringUtils.isEmpty(recipient)){throw new AddressException("邮箱账号不能为空",recipient);}return recipient + "@company.com";}@Override public String toString() {return "MailEntry{" +"recipients=" + Arrays.toString(recipients) +", carbonCopy=" + Arrays.toString(carbonCopy) +", subject='" + subject + '\'' +", text='" + text + '\'' +'}';} }
说明：由于我们是使用企业邮箱发送邮件，而一般业务都只能取到公司用户名而非真正的邮箱地址，所以在上面实体类里进行了一次转换，如果能直接拿到邮箱地址的话上面的转换是不需要的。收件人和抄送人都是支持数组形式的参数，所以在这里直接使用数组作为收件人、抄送人属性，发送邮件的时候只要直接设置成数组参数即可。
Step4、发送邮件业务层实现
import org.apache.commons.lang3.ArrayUtils; import org.springframework.core.task.TaskExecutor; import org.springframework.mail.javamail.JavaMailSender; import org.springframework.mail.javamail.MimeMessageHelper; import org.springframework.stereotype.Service;import javax.annotation.Resource; import javax.mail.MessagingException; import javax.mail.internet.MimeMessage;/*** <p>* <code>MailServiceImpl</code>* </p>* Description:* 邮件系统实现类* @author jianzh5* @version 2017/3/31 17:10* @since 1.0*/@Service public class MailServiceImpl implements IMailService{private LoggerUtil logger = LoggerUtil.getLogger(this.getClass());@Resourceprivate TaskExecutor taskExecutor;@Resourceprivate JavaMailSender javaMailSender;@Overridepublic void sendMail(MailEntry mailEntry) {MimeMessage message = javaMailSender.createMimeMessage();try {MimeMessageHelper helper = new MimeMessageHelper(message, true, "utf-8");helper.setFrom("xxx@company.com");helper.setTo(mailEntry.getRecipients()); //收件人if(ArrayUtils.isNotEmpty(mailEntry.getCarbonCopy())){helper.setCc(mailEntry.getCarbonCopy()); //抄送人 }helper.setSubject(mailEntry.getSubject());helper.setText(mailEntry.getText(),true);//设置为TRUE则可以使用Html标记 addSendMailTask(message);} catch (MessagingException e) { // e.printStackTrace();logger.error("邮件转换异常,邮件详细信息为{}",e.getMessage());}}/*** @desc 使用多线程发送邮件* @author jianzh5* @date 2017/4/1 11:41* @param message MimeMessage邮件封装类*/private void addSendMailTask(final MimeMessage message){try{taskExecutor.execute(new Runnable() {@Overridepublic void run() {javaMailSender.send(message);}});}catch (Exception e){logger.error("邮件发送异常,邮件详细信息为{}",e.getMessage());}} }
