Spring的JavaMail实现异步发送邮件

具体背景就不说了，可以网上搜索相关知识，或者直接看Sping MailSender的官坊网页。这里就直接实战了（Java实现异步发送电子邮件，包含中文无乱码）。

Maven：

<dependency>
<groupId>com.sun.mail</groupId>
<artifactId>javax.mail</artifactId>
<version>1.5.0</version>
</dependency>

ApplicationContext.xml：

<!-- SET default mail properties -->
<bean id="mailSender" class="org.springframework.mail.javamail.JavaMailSenderImpl">
<property name="host" value="smtp.sina.com"/>
<property name="protocol" value="smtp" />
<!-- 465 for Gamil -->
<property name="port" value="25"/>
<property name="username" value="xxx@sina.com"/>
<property name="password" value="xxx"/>
<property name="javaMailProperties">
<props>
<prop key="mail.transport.protocol">smtp</prop>
<prop key="mail.smtp.auth">true</prop>
<!-- true for Gamil -->
<prop key="mail.smtp.starttls.enable">false</prop>
<prop key="mail.debug">true</prop>
</props>
</property>
</bean>

<!--Asyn send Eamil-->
<bean id="taskExecutor" class="org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor">
<property name="corePoolSize" value="10"/>
<property name="maxPoolSize" value="30"/>
</bean>

<!-- You can have some pre-configured messagess also which are ready to send -->
<bean id="preConfiguredMessage" class="org.springframework.mail.SimpleMailMessage">
<property name="to" value="xxx@gmail.com"></property>
<property name="from" value="xxx@sina.com"></property>
<property name="subject" value="Test email from sina."/>
</bean>

Email实体类：

package com.xxx;

import java.io.Serializable;

/**
* @author
*
*/
public class ApplicationEmail implements Serializable {

public String getAddressee() {
return addressee;
}
public void setAddressee(String addressee) {
this.addressee = addressee;
}
public String getCc() {
return cc;
}
public void setCc(String cc) {
this.cc = cc;
}
public String getSubject() {
return subject;
}
public void setSubject(String subject) {
this.subject = subject;
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}

/**收件人**/
private String addressee;
/**抄送给**/
private String cc;
/**邮件主题**/
private String subject;
/**邮件内容**/
private String content;
/**附件**/
//private MultipartFile[] attachment = new MultipartFile[0];

}

异步邮件发送封装类：

package com.xxx;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.Properties;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeUtility;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.core.task.TaskExecutor;
import org.springframework.mail.SimpleMailMessage;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.MimeMessageHelper;
import org.springframework.stereotype.Service;

import com.xxx.Mailer;

/**
* @author
*
*/
@Service
public class ApplicationMailer implements Mailer
{
@Autowired
private JavaMailSender mailSender;

@Autowired
private TaskExecutor taskExecutor;

@Autowired
private SimpleMailMessage preConfiguredMessage;

/**
* 同步发送邮件
*
* @param email
* @throws MessagingException
* @throws IOException
*/
public void sendMailBySynchronizationMode(ApplicationEmail email) throws MessagingException, IOException {
Session session=Session.getDefaultInstance(new Properties());
MimeMessage mime= new MimeMessage(session);
MimeMessageHelper helper = new MimeMessageHelper(mime, true, "utf-8");
helper.setFrom("xxx@sina.com");//发件人
helper.setTo(InternetAddress.parse(email.getAddressee()));//收件人
//helper.setBcc("administrator@chinaptp.com");//暗送
helper.setReplyTo("xxx@sina.com");//回复到
helper.setSubject(email.getSubject());//邮件主题
helper.setText(email.getContent(), true);//true表示设定html格式

mailSender.send(mime);
}

/**
* 异步发送邮件
*
* @param email
*/
public void sendMailByAsynchronousMode(final ApplicationEmail email){  taskExecutor.execute(new Runnable(){
public void run(){
try {
sendMailBySynchronizationMode(email);
} catch (Exception e) {
}
}
});
}
}

public interface Mailer {
public void sendMailByAsynchronousMode(final ApplicationEmail email);
}

调用Service异步发送邮件：

@Autowired
private Mailer mailer;

//这是要异步发送邮件
ApplicationEmail email = new ApplicationEmail();
email.setAddressee("xxx@gmail.com");
email.setSubject("测试邮件有一份");
email.setContent("这个是内容html内容");
mailer.sendMailByAsynchronousMode(email);

这里实现异步使用的是Task Execution，也可以用异步注解@Async，或者JMS（需要J2EE环境）；如果需要调度可以用Quartz（使用场景如：每天2:00需要批量给会员发邮件）

如果要实现高可靠的高并发的异步邮件发送，可以用JMS或Queue，参考。

本文结束。（干货分享：Spring和JavaMail发送邮件的经验.pdf）