使用 Java 发送邮件

<!-- Javamail -->
<dependency>
    <groupId>javax.mail</groupId>
    <artifactId>mail</artifactId>
    <version>1.4.4</version>
</dependency>

/**
 * java程序发送邮件
 * @author Mr.song
 * @date 2019/05/24 16:17
 */
public class JavaMail {
    public static void main(String[] args) throws Exception {
        //1.配置发送邮件的属性
        Properties properties = new Properties();
        properties.setProperty("mail.smtp.host", "localhost"); //设置协议主机
        properties.setProperty("mail.smtp.auth", "true"); //设置smtp是否需要认证
        //2.根据属性获得一个会话
        Session session = Session.getInstance(properties);
        //3.设置会话是debug模式(会打印更多相关信息)
        session.setDebug(true);
        //4.创建邮件主题信息对象
        MimeMessage message = new MimeMessage(session);
        //5.设置发件人
        message.setFrom(new InternetAddress("dintalk@sh.com"));
        //6.设置邮件主题
        message.setSubject("我的第一份java邮件");
        //7.设置邮件正文
        message.setText("第一份邮件发送成功了,哈哈");
        //8.设置收件人: TO-发送    CC-抄送   BCC-密送
        message.setRecipient(Message.RecipientType.TO, new InternetAddress("talkdin@sh.com"));
        //9.获取发送器对象:提供指定的协议
        Transport transport = session.getTransport("smtp");
        //10.设置发件人的信息
        transport.connect("localhost", "dintalk", "123456");
        //11.发送邮件
        transport.sendMessage(message, message.getAllRecipients());
        //12.关闭资源
        transport.close();
    }
}

/**
 * @author Mr.song
 * @date 2019/05/24 16:53
 */
public class MailUtil {
    /**
     * 工具类发送邮件的方法里，发件邮箱的信息是固定的
     * @param map ： 收件地址和发送类型 (地址作 key)
     * @param subject : 邮件的主题
     * @param content ： 邮件的正文
     * @throws MessagingException
     */
    public static void sendMail(Map<String,String>map,String subject,String content) 
        throws MessagingException {
        //1.配置发送邮件的属性
        Properties properties = new Properties();
        properties.setProperty("mail.smtp.host","localhost"); //设置协议主机
        properties.setProperty("mail.smtp.auth","true"); //设置smtp是否需要认证
        //2.根据属性获得一个会话
        Session session = Session.getInstance(properties);
        //3.设置会话是debug模式(会打印更多相关信息,生产环境可设为false)
        session.setDebug(true);
        //4.创建邮件主题信息对象
        MimeMessage message = new MimeMessage(session);
        //5.设置发件人
        message.setFrom(new InternetAddress("dintalk@sh.com"));
        //6.设置邮件主题
        message.setSubject(subject);
        //7.设置邮件正文
        message.setText(content);
        //8.设置收件人: TO-发送    CC-抄送   BCC-密送
        for (Map.Entry<String, String> me : map.entrySet()) {
            String email = me.getKey(); //邮件地址
            String type = me.getValue(); //邮件类型
            if ("to".equalsIgnoreCase(type)){
                //发送
                message.setRecipient(Message.RecipientType.TO,new InternetAddress(email));
            }else if ("cc".equalsIgnoreCase(type)){
                //抄送
                message.setRecipient(Message.RecipientType.CC,new InternetAddress(email));
            }else if ("bcc".equalsIgnoreCase(type)){
                //密送
                message.setRecipient(Message.RecipientType.BCC,new InternetAddress(email));
            }
        }
        //9.获取发送器对象:提供指定的协议
        Transport transport = session.getTransport("smtp");
        //10.设置发件人的信息
        transport.connect("localhost","dintalk","123456");
        //11.发送邮件
        transport.sendMessage(message,message.getAllRecipients());
        //12.关闭资源
        transport.close();
    }
}

/**
 * 使用工具类发送邮件
 * @author Mr.song
 * @date 2019/05/24 16:47
 */
public class UtilMail {
    public static void main(String[] args) throws Exception{
        Map<String,String> map = new HashMap<>();
        map.put("din@sh.com","to");
        map.put("talk@sh.com","cc");
        map.put("talkdin@sh.com","bcc");
        MailUtil.sendMail(map,"我的第二封邮件","使用工具类发送邮件....");
    }
}

<!-- Javamail -->
<dependency>
    <groupId>javax.mail</groupId>
    <artifactId>mail</artifactId>
    <version>1.4.4</version>
</dependency>
<!--整合spring坐标-->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context-support</artifactId>
    <version>5.0.4.RELEASE</version>
</dependency>

#设置发件方邮箱地址
mail.from=dintalk@sh.com
#设置协议主机
mail.host=localhost
#设置发件方用户名
mail.username=dintalk
#设置发件方密码
mail.password=123456
#设置邮件编码格式
mail.encoding=UTF-8
#设置邮件发送协议
mail.protocol=smtp

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
             http://www.springframework.org/schema/beans/spring-beans.xsd
             http://www.springframework.org/schema/context
             http://www.springframework.org/schema/context/spring-context.xsd">
    <!-- 1.指定引入其他资源文件.properties文件 -->
    <context:property-placeholder location="classpath:mail.properties"/>
    <!-- 2.配置简单邮件消息对象 -->
    <bean id="mailMessage" class="org.springframework.mail.SimpleMailMessage">
        <!-- 此时我们只需要注入发件箱名称即可。不要注入主题,正文,收件箱等不固定的信息 -->
        <property name="from" value="${mail.from}"></property>
    </bean>

    <!-- 3.配置邮件发送器 -->
    <bean id="mailSender" class="org.springframework.mail.javamail.JavaMailSenderImpl">
        <property name="host" value="${mail.host}"></property>
        <property name="username" value="${mail.username}"></property>
        <property name="password" value="${mail.password}"></property>
        <property name="defaultEncoding" value="${mail.encoding}"></property>
        <property name="protocol" value="${mail.protocol}"></property>
        <property name="javaMailProperties">
            <props>
                <!-- 是否需要验证 -->
                <prop key="mail.smtp.auth">true</prop>
                <!-- 是否需要debug的信息 -->
                <prop key="mail.debug">true</prop>
                <!-- 设置发送超时时间，以秒为单位。0为永不超时 -->
                <prop key="mail.smtp.timeout">0</prop>
            </props>
        </property>
    </bean>
</beans>

/**
 * 整合Spring的邮件发送
 * @author Mr.song
 * @date 2019/05/24 17:07
 */
public class SpringMail {

    public static void main(String[] args) throws MessagingException {
        //1.获取Spring容器
        ApplicationContext ac = new ClassPathXmlApplicationContext
            ("classpath:applicationContext-mail.xml");
        //2.获取消息对象
        SimpleMailMessage mailMessage = (SimpleMailMessage) ac.getBean("mailMessage");
        //3.设置邮件的主题
        mailMessage.setSubject("Spring整合javamail");
        //4.设置邮件的内容,和收件人信息
        mailMessage.setText("Spring整合javamail成功");
        mailMessage.setTo("din@sh.com","talk@sh.com");
        mailMessage.setCc("talkdin@sh.com");
        //5.获取邮件发送对象
        JavaMailSenderImpl mailSender = (JavaMailSenderImpl) ac.getBean("mailSender");
        //6.发送邮件
        mailSender.send(mailMessage);
    }
}

/**
 * 发送带附件的邮件
 * @author Mr.song
 * @date 2019/05/24 17:35
 */
public class AttachmentMail {
    public static void main(String[] args) throws MessagingException {
        //1.获取spring的容器
        ApplicationContext ac = new ClassPathXmlApplicationContext
                ("classpath:applicationContext-mail.xml");
        //2.获取发送器对象（spring提供的）
        JavaMailSenderImpl sender = (JavaMailSenderImpl) ac.getBean("mailSender");
        //3.获取MimeMessage
        MimeMessage mailMessage = sender.createMimeMessage();
        //4.创建spring提供的复杂邮件的帮助对象
        MimeMessageHelper helper = new MimeMessageHelper(mailMessage, true);
        //5.设置发件人邮箱
        helper.setFrom("dintalk@sh.com");
        //6.设置邮件的收件人
        helper.setTo("din@sh.com");
        //7.设置邮件的主题
        helper.setSubject("带有附件和图片的邮件");
        //8.设置邮件的正文
        helper.setText("<html><head></head><body><h1>这是一封带有附件和图片的邮件</h1><img src=cid:image></body></html>", true);
        //9.设置图片
        FileSystemResource resource = new FileSystemResource(new File("C:\\Users\\Administrator\\Desktop\\1.png"));
        //10.使用图片替换cid (cid是规定的，只能用cid)
        helper.addInline("image", resource);
        //11.设置附件
        helper.addAttachment("1.png", resource);
        //12.发送邮件
        sender.send(mailMessage);
    }
}