java邮件发送工具

最近在web项目中，客户端注册时需要通过邮箱验证，服务器就需要向客户端发送邮件，我把发送邮件的细节进行了简易的封装：

在maven中需要导入：

<!--Email-->
<dependency>
   <groupId>javax.mail</groupId>
   <artifactId>mail</artifactId>
   <version>1.4.7</version>
</dependency>
<dependency>
   <groupId>javax.activation</groupId>
   <artifactId>activation</artifactId>
   <version>1.1.1</version>
</dependency>

发送方的封装：

import javax.mail.Authenticator;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import java.util.Properties;

public abstract class MailSession implements EmailConstant {
	// Mail的Session对象
    protected Session session;
	// 发送方邮箱
    protected String srcEmail;
	// 发送方的授权码（不是邮箱登陆密码，如何获取请百度）
    protected String authCode;

    protected MailSession(String srcEmail, String authCode) {
        this.srcEmail = srcEmail;
        this.authCode = authCode;

        createSession();
    }

    protected abstract void doCreateSession(Properties properties);

    private void createSession() {
    	// 获取系统属性，并设置
        Properties properties = System.getProperties();
		// 由于不同的邮箱在初始化Session时有不同的操作，需要由子类实现
        doCreateSession(properties);
        properties.setProperty(MAIL_AUTH, "true");
		
		// 生成Session对象
        session = Session.getDefaultInstance(properties, new Authenticator() {
            @Override
            public PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(srcEmail, authCode);
            }
        });
    }

    public Session getSession() {
        return session;
    }

    public String getSrcEmail() {
        return srcEmail;
    }

    @Override
    public String toString() {
        return "MailSession{" +
                "session=" + session +
                ", srcEmail='" + srcEmail + '\'' +
                ", authCode='" + authCode + '\'' +
                '}';
    }

}

EmailConstant ：

/**
*  需要的系统属性
**/
public interface EmailConstant {
    String HOST_QQ = "smtp.qq.com";
    String HOST_163 = "smtp.163.com";
    String MAIL_HOST = "mail.smtp.host";
    String MAIL_AUTH = "mail.smtp.auth";
    String MAIL_SSL_ENABLE = "mail.smtp.ssl.enable";
    String MAIL_SSL_SOCKET_FACTORY = "mail.smtp.ssl.socketFactory";
}

163邮箱的系统设置：

public class WYMailSession extends MailSession {

    public WYMailSession(String srcEmail, String authCode) {
        super(srcEmail, authCode);
    }

    @Override
    protected void doCreateSession(Properties properties) {
        properties.setProperty(MAIL_HOST, EmailConstant.HOST_163);
    }

}

QQ邮箱的系统设置：

public class QQMailSession extends MailSession {

    public QQMailSession(String srcEmail, String authCode) {
        super(srcEmail, authCode);
    }

    @Override
    protected void doCreateSession(Properties properties) {
        properties.setProperty(MAIL_HOST, EmailConstant.HOST_QQ);

        try {
            MailSSLSocketFactory mailSSLSocketFactory = new MailSSLSocketFactory();
            mailSSLSocketFactory.setTrustAllHosts(true);
            properties.put(MAIL_SSL_ENABLE, "true");
            properties.put(MAIL_SSL_SOCKET_FACTORY, mailSSLSocketFactory);
        } catch (GeneralSecurityException e) {
            e.printStackTrace();
        }
    }

}

发送的邮件封装：

public class MailMessage {
	// 接收方邮箱
    private String tagEmail;
	// 主题
    private String subJect;
	// 内容
    private String content;

    public MailMessage(String tagEmail, String subJect, String content) {
        this.tagEmail = tagEmail;
        this.subJect = subJect;
        this.content = content;
    }

    public String getTagEmail() {
        return tagEmail;
    }

    public String getSubJect() {
        return subJect;
    }

    public String getContent() {
        return content;
    }

    @Override
    public String toString() {
        return "MailMessage{" +
                "tagEmail='" + tagEmail + '\'' +
                ", subJect='" + subJect + '\'' +
                ", content='" + content + '\'' +
                '}';
    }

}

发送部分：

import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.util.Queue;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.Executor;

public class MailSender {

    private static final Logger LOGGER = LoggerFactory.getLogger(MailSender.class);
	
	// 这个队列是有在多个发送方的情况下，可以轮流发送
    private final Queue<MailSession> queue = new ConcurrentLinkedQueue<>();
    
	// 使用线程池，让线程去完成发送
    private final Executor executor;

    public MailSender(Executor executor) {
        this.executor = executor;
    }

	// 指定发送方，发送邮件
    public void sendTo(MailSession mailSession, MailMessage mailMessage) {
        if (mailSession == null) {
            String msg = "MailSender sendTo(), mailSession can not null!";
            if (LOGGER.isErrorEnabled()) {
                LOGGER.error(msg);
            }
            throw new NullPointerException(msg);
        }

        if (!queue.contains(mailSession)) {
            addSender(mailSession);
        }

        executor.execute(new Runnable() {
            @Override
            public void run() {
                Message message = new MimeMessage(mailSession.getSession());
                try {
                    message.setFrom(new InternetAddress(mailSession.getSrcEmail()));
                    // 设置接收人
                    message.addRecipient(Message.RecipientType.TO, new InternetAddress(mailMessage.getTagEmail()));
                    // 设置邮件主题
                    message.setSubject(mailMessage.getSubJect());
                    // 设置邮件内容
                    message.setContent(mailMessage.getContent(), "text/html;charset=UTF-8");
                    // 发送邮件
                    Transport.send(message);

                    if (LOGGER.isInfoEnabled()) {
                        LOGGER.info("MailSender [thread:" + Thread.currentThread().getName()
                                + "] send email["
                                + "from: " + mailSession.getSrcEmail()
                                + ", to: " + mailMessage.getTagEmail()
                                + ", subject: " + mailMessage.getSubJect()
                                + ", content: " + mailMessage.getContent()
                                + "]");
                    }
                } catch (MessagingException e) {
                    e.printStackTrace();
                }

            }
        });
    }

	// 未指定发送方，由队列轮流发送
    public void sendTo(MailMessage mailMessage) {
        if (mailMessage == null) {
            String msg = "MailSender sendTo(), mailMessage not defined!";
            if (LOGGER.isErrorEnabled()) {
                LOGGER.error(msg);
            }
            throw new NullPointerException(msg);
        }

        MailSession mailSession = queue.poll();
        queue.add(mailSession);

        sendTo(mailSession, mailMessage);
    }

    public void addSender(MailSession mailSession) {
        if (mailSession == null) {
            String msg = "MailSender addSender(), sender not defined!";
            if (LOGGER.isErrorEnabled()) {
                LOGGER.error(msg);
            }
            throw new NullPointerException(msg);
        }

        queue.add(mailSession);

        if (LOGGER.isInfoEnabled()) {
            LOGGER.info("MailSender add sender:[" + mailSession + "]");
        }
    }

    public MailSession removeSender(MailSession mailSession) {
        if (queue.remove(mailSession)) {
            if (LOGGER.isInfoEnabled()) {
                LOGGER.info("MailSender remove sender:[" + mailSession + "]");
            }
        }

        return mailSession;
    }

}

测试：

public class Demo {

    public static void main(String[] args) {
        Executor executor = Executors.newCachedThreadPool(new NamedThreadFactory("ZC_Email"));
        MailSender sender = new MailSender(executor);
        sender.sendTo(new QQMailSession("xxxxx@qq.com", "xxxxx"),
                new MailMessage("xxxx@163.com", "java邮件！", "这是使用java发送的邮件！请查收"));
		
		// TODO 记得线程池的关闭
    }

}

日志输出：

18:24:02.871 [main] INFO com.zc.util.logger.LoggerFactory - using logger: com.zc.util.logger.slf4j.Slf4jLoggerAdapter
18:24:04.243 [main] INFO com.zc.util.mail.MailSender -  [ZC-LOGGER] MailSender add sender:[MailSession{session=javax.mail.Session@1134affc, srcEmail='xxxxxx@qq.com', authCode='ijsuavtbasohbgbb'}], current host: 172.19.126.174
18:24:05.990 [ZC_Email-thread-1] INFO com.zc.util.mail.MailSender -  [ZC-LOGGER] MailUtils [thread:ZC_Email-thread-1] send email[from: xxxxx@qq.com, to: xxxxxx@163.com, subject: java邮件！, content: 这是使用java发送的邮件！请查收], current host: 172.19.126.174

邮件截图：