Java SpringBoot使用126邮箱发送html内容邮件，带附件

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package mail.demo;   import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.test.context.SpringBootTest; import org.springframework.mail.MailSender; import org.springframework.mail.SimpleMailMessage; import org.springframework.mail.javamail.JavaMailSenderImpl; import org.springframework.mail.javamail.MimeMailMessage; import org.springframework.mail.javamail.MimeMessageHelper; import org.springframework.test.context.junit4.SpringRunner;   import javax.mail.MessagingException; import javax.mail.internet.MimeMessage; import java.io.File;   @RunWith(SpringRunner.class) @SpringBootTest public class DemoApplicationTests {       /* pom.xml中添加依赖     *   <!--添加 mail 依赖-->         <dependency>             <groupId>org.springframework.boot</groupId>             <artifactId>spring-boot-starter-mail</artifactId>         </dependency>     * */       @Autowired     JavaMailSenderImpl javaMailSender;       /**      * 发送简单邮件      */     @Test     public void sendMail() {         SimpleMailMessage message = new SimpleMailMessage();         message.setSubject("这是测试邮件");         message.setText("这是正文");         message.setTo("xxxx@qq.com");         message.setFrom("xxxxx@126.com");         javaMailSender.send(message);     }       /**      * 发送复杂邮件 html内容或带附件      */     @Test     public void sendMail2() {         MimeMessage message = javaMailSender.createMimeMessage();         MimeMessageHelper helper = null;         try {             helper = new MimeMessageHelper(message, true);             helper.setSubject("这是测试邮件");             // 发送html格式内容             helper.setText("<font style='color:red'>这是正文</font>",true);             helper.setTo("xxxx@qq.com");             helper.setFrom("xxxx@126.com");               //添加附件             helper.addAttachment("1.jpg",new File("c:\\1.jpg"));         } catch (MessagingException e) {             e.printStackTrace();         }         javaMailSender.send(message);     }     }

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spring:   mail:     host: smtp.126.com     password: xxxx     username: xxxx@126.com     properties:       mail:         smtp:           auth: true           starttls:             enable: true             required: true