pom.xml 导入包

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-mail</artifactId>
            <version>2.1.7.RELEASE</version>
 </dependency>

application.properties 配置信息

## 邮箱配置
#spring.mail.host=smtp.163.com
## 你的163邮箱
#spring.mail.username=18603@163.com
## 注意这里不是邮箱密码，而是SMTP授权密码
#spring.mail.password=*****
#spring.mail.port=25
#spring.mail.default-encoding=UTF-8
#spring.mail.from=18603@163.com

代码

package com.youjia.found.manager;
import com.youjia.found.common.util.Check;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.core.io.FileSystemResource;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.MimeMessageHelper;
import org.springframework.stereotype.Component;
import javax.annotation.Resource;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.io.File;

/**
 * <P>邮件处理类</P>
 *
 * @author eric
 * @date 2020/2/6 11:08 AM
 * @since
 */
@Component
public class MailManager {
    
    private final Logger logger = LoggerFactory.getLogger(this.getClass());
    @Value("${spring.mail.from}")
    private String from;
    @Autowired
    private JavaMailSender mailSender;
    
    /**
     * 带附件的邮件
     * @param to 收件人
     * @param subject 主题
     * @param content 内容
     * @param filePath 附件
     */
    public boolean sendMail(String to, String subject, String content, String filePath) {
        logger.info("stmp邮件发送 to:{}, subject:{}, content:{},filePath:{}", to, subject, content,filePath);
        boolean isOK=false;
        MimeMessage message = mailSender.createMimeMessage();
        try {
            MimeMessageHelper helper = new MimeMessageHelper(message, true);
            helper.setFrom(from);
            //支持多个收件人
            InternetAddress[] internetAddressTo = InternetAddress.parse(to);
            helper.setTo(internetAddressTo);
            helper.setSubject(subject);
            helper.setText(content, true);
            //附件
            if(Check.notEmpty(filePath)){
                FileSystemResource file = new FileSystemResource(new File(filePath));
                String fileName = filePath.substring(filePath.lastIndexOf(File.separator));
                helper.addAttachment(fileName, file);
            }
            mailSender.send(message);
            isOK= true;
        } catch (Exception e) {
            logger.error(e.getMessage(),e);
            isOK= false;
        }
        
        return isOK;
    }
    
    
}