Java 发邮件

1. 邮件协议

　　发送邮件协议：smtp

　　查收邮件协议：pop3

2. 依赖

    <dependency>
      <groupId>javax.mail</groupId>
      <artifactId>mail</artifactId>
      <version>1.4.7</version>
    </dependency>

3. 使用qq邮箱给163邮箱发送邮件

　　使用前发件箱要开启 SMTP服务 ，并获得授权码

public class EmailTest {
    public static void main(String[] args) {
        Properties properties = new Properties();
        //设置发送邮件客户端和协议
        properties.setProperty("mail.host","smtp.qq.com");
        properties.setProperty("mail.transport.protocol","smtp");
        //获取会话和传输对象
        Session session = Session.getDefaultInstance(properties);
        Transport ts = null;
        try {
            //获取传输对象发送邮件
            ts = session.getTransport();
            //发送邮件前先进行校验
            ts.connect("xx@qq.com","授权码");
            //构建邮件
            Message message = new MimeMessage(session);
            // 发送人
            message.setFrom(new InternetAddress("xx@qq.com"));
            // 收件人  Message.RecipientType.TO
            //抄送：Message.RecipientType.CC
            //密送：Message.RecipientType.BCC
            message.setRecipient(Message.RecipientType.TO,new InternetAddress("xx@163.com"));
            // 主题
           message.setSubject("使用qq邮箱给163发送邮件");
            // 正文
            message.setContent("测试邮件","text/html;charset=utf-8");
            //message.setSubject("激活邮件");
            //message.setContent("这是一个激活邮件：<a href='http://www.baidu.com'>点击激活</a>","text/html;charset=utf-8");
            //保存邮件
            message.saveChanges();
            //发送邮件
            ts.sendMessage(message,message.getAllRecipients());
        } catch (MessagingException e) {
            e.printStackTrace();
        }finally {
            if (ts != null){
                try {
                    ts.close();
                } catch (MessagingException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

4. 封装工具类

public class EmailUtil {
    /**
     * @param to    收件人
     * @param subject   主题
     * @param context   正文
     */
    public static void sendEmail(String to,String subject,String context){
        Properties properties = new Properties();
        properties.setProperty("mail.host","smtp.qq.com");
        properties.setProperty("mail.transport.protocol","smtp");
        Session session = Session.getDefaultInstance(properties);
        Transport ts = null;
        try {
            ts = session.getTransport();
            ts.connect("xx@qq.com","授权码");
            Message message = new MimeMessage(session);
            message.setFrom(new InternetAddress("xx@qq.com"));
            message.setRecipient(Message.RecipientType.TO,new InternetAddress(to));
            message.setSubject(subject);
            message.setContent(context,"text/html;charset=utf-8");
            message.saveChanges();
            ts.sendMessage(message,message.getAllRecipients());
        } catch (MessagingException e) {
            e.printStackTrace();
        }finally {
            if (ts != null){
                try {
                    ts.close();
                } catch (MessagingException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}