==================
通过Spring发送邮件
==================

在pom.xml中添加依赖：

<!-- Spring环境 -->
<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-context</artifactId>
  <version>5.2.4.RELEASE</version>
</dependency>
<!-- Spring支持 -->
<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-context-support</artifactId>
  <version>5.2.4.RELEASE</version>
</dependency>
<!-- Spring测试 -->
<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-test</artifactId>
  <version>5.2.4.RELEASE</version>
  <scope>test</scope>
</dependency>

在spring.xml中配置Bean：

<?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">

    <!-- 开启自动扫描 -->
    <context:component-scan base-package="cn.tedu.springmail" />

    <!-- 邮件发送器 -->
    <bean id="mailSender" class="org.springframework.mail.javamail.JavaMailSenderImpl">
        <property name="host" value="smtp.163.com" />
        <property name="port" value="25" />
        <property name="defaultEncoding" value="utf-8" />
        <property name="username" value="johnmin740523" />
        <property name="password" value="QRPYPLKSXOCPPBBN" />
    </bean>

    <!-- 普通文本邮件 -->
    <bean id="simpleMail" class="org.springframework.mail.SimpleMailMessage">
        <property name="from" value="johnmin740523@163.com" />
        <property name="to" value="johnmin740523@163.com" />
        <property name="subject" value="普通文本邮件" />
        <property name="text" value="这是一封普通文本邮件" />
    </bean>
</beans>

邮件服务接口：

// 邮件服务接口
public interface MailService {
    // 发送邮件
    void sendMail();
}

普通文本邮件服务类：

// 普通文本邮件服务类
@Service
public class PlainTextMailService implements MailService {
    @Resource // 注入邮件发送器
    private MailSender mailSender;
    @Resource // 注入普通文本邮件
    private SimpleMailMessage simpleMail;

    // 发送邮件
    @Override
    public void sendMail() {
        simpleMail.setSentDate(new Date()); // 时间

        try {
            // 发送邮件
            mailSender.send(simpleMail);
        }
        catch (MailException exception) {
            exception.printStackTrace();
        }
    }
}

普通文本邮件服务测试类：

// 普通文本邮件服务测试类
public class PlainTextMailServiceTest {
    // 测试：发送邮件
    @Test
    public void testSendMail() {
        BeanFactory beanFactory =
            new ClassPathXmlApplicationContext("spring.xml");
        MailService mailService = beanFactory.getBean(
            "plainTextMailService", MailService.class);
        mailService.sendMail();
    }
}

运行，登录163邮箱查看。

带附件的邮件服务类：

// 带附件的邮件服务类
@Service
public class AttachmentsMailService implements MailService {
    @Resource // 注入邮件发送器
    private JavaMailSender mailSender;

    // 发送邮件
    @Override
    public void sendMail() {
        try {
            // 创建邮件对象
            MimeMessage message = mailSender.createMimeMessage();

            // 填充邮件内容
            MimeMessageHelper helper =
                new MimeMessageHelper(message, true, "utf-8");
            helper.setFrom("johnmin740523@163.com"); // 发件人
            helper.setTo("johnmin740523@163.com"); // 收件人
            helper.setSentDate(new Date()); // 时间
            helper.setSubject("带附件的邮件"); // 主题
            helper.setText("这是一封带附件的邮件"); // 正文
            File file1 = new File(
                "C:\\Users\\Administrator\\Work\\34_研发课时\\肖旭伟_研发统计表.xlsx");
            helper.addAttachment(file1.getName(), file1); // 附件
            File file2 = new File(
                "C:\\Users\\Administrator\\Work\\31_智库\\photo.jpg");
            helper.addAttachment(file2.getName(), file2); // 附件

            // 发送邮件
            mailSender.send(message);
        }
        catch (MessagingException exception) {
            exception.printStackTrace();
        }
    }
}

带附件的邮件服务测试类：

// 带附件的邮件服务测试类
public class AttachmentsMailServiceTest {
    // 测试：发送邮件
    @Test
    public void testSendMail() {
        BeanFactory beanFactory =
            new ClassPathXmlApplicationContext("spring.xml");
        MailService mailService = beanFactory.getBean(
            "attachmentsMailService", MailService.class);
        mailService.sendMail();
    }
}

运行，登录163邮箱查看。