javaMailSender发送邮件，基于Spring Boot

一、引入依赖

        <!--邮件-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-mail</artifactId>
        </dependency>
        
        <!--日志-->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.7.25</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.25</version>
        </dependency>
        
        <!--工具集-->
        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>5.8.12</version>
        </dependency>

二、配置文件配置

spring:
  servlet:
    multipart:
      max-file-size:  10MB
      max-request-size: 50MB
  mail:
    host: #填写邮箱服务器地址
    port: 465 #服务器端口
    username: #发件人邮箱号
    password: #邮箱登录密码，或授权码
    default-encoding: utf-8
    protocol: smtp #邮件协议
    test-connection: true
    properties:
      mail:
#        是否发送正文
        mime:
          multipart:
            allowempty: true
        smtp:
          ssl:
            enable: true
          starttls:
            enable: true
            required: true
#          connectiontimeout: 10000 #建立连接时间限制
#          timeout: 10000 #邮件接收时间限制
#          wridtetimeout: 10000 #邮件发送时间限制
          auth: true

三、具体代码

@Service
public class MailService {
    
    private Logger logger = LoggerFactory.getLogger(getClass());//提供日志类
    
    @Autowired
    private JavaMailSenderImpl javaMailSender;
    
    /*public JavaMailSenderImpl createJavaMailSender(JavaMailSenderImpl javaMailSender) { //依赖注入报红线时可以试试，不管也可以用
        return this.javaMailSender = new JavaMailSenderImpl();
    }*/

    public boolean sendMail(Mail mail) {
        try {
            /*没有传入发件人，设置默认*/
            if (StrUtil.isEmpty(mail.getFrom()))
                mail.setFrom("邮箱号");
            /*    邮箱号为这种形式时可用该方法，获取别名和邮箱号
            mail.setFrom("\"别名\" <邮箱号>");
            InternetAddress internetAddress = new InternetAddress(mail.getFrom());
                                        邮箱号                        别名
            mimeMessageHelper.setFrom(internetAddress.getAddress(), internetAddress.getPersonal());
            */

            /*没有发件人或收件人*/
            if (StrUtil.isEmpty(mail.getFrom()) || StrUtil.isEmpty(mail.getTo()))
                return false;
            /*创建邮件*/
            MimeMessage mimeMessage = javaMailSender.createMimeMessage();
            MimeMessageHelper mimeMessageHelper = new MimeMessageHelper(mimeMessage, true);//true：识别html格式

            /*发件人*/
            mimeMessageHelper.setFrom(mail.getFrom());
            /*收件人*/
            if (mail.getTo().contains(",") || mail.getTo().contains("，")) {
                String[] split = null;
                /*判断收件人邮箱号并拆分*/
                if (mail.getTo().contains(","))
                    split = mail.getTo().split(",");
                if (mail.getTo().contains("，"))
                    split = mail.getTo().split("，");
                /*放入 InternetAddress 类型的list*/
                ArrayList<InternetAddress> list = new ArrayList<>();
                for (Iterator<String> iterator = Arrays.stream(split).iterator(); iterator.hasNext(); ) {
                    list.add(new InternetAddress(iterator.next()));
                }
                /*转 InternetAddress 数组*/
                InternetAddress[] addresses = list.toArray(new InternetAddress[list.size()]);
                mimeMessageHelper.setTo(addresses);
            } else
                mimeMessageHelper.setTo(mail.getTo());

            /*发送时间*/
            mimeMessageHelper.setSentDate(new Date());
            /*主题*/
            mimeMessageHelper.setSubject(mail.getSubject());

            /*正文*/
            if (mail.getFiles() != null) {
                /*正文包含图片*/
                int i = 0;
                for (MultipartFile multipartFile : mail.getFiles()) {
                    ++i;
                    mimeMessageHelper.setText(mail.getText() + "<div><img src='cid:" + i + "'/></div>", true);
                    File file = multipartFileToFile.multipartFileToFiles(multipartFile);/* MultipartFile 转 File */
                    mimeMessageHelper.addInline(StrUtil.toString(i), new FileSystemResource(file));
                }
            } else
                mimeMessageHelper.setText(mail.getText());
            
            /*正文需发送html时*/
            /*
            String property = System.getProperty("user.dir");//获取当前项目路径
            SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy年MM月dd日");
            String time = simpleDateFormat.format(System.currentTimeMillis());
            StringBuffer stringBuffer = new StringBuffer();
            stringBuffer.append("<!DOCTYPE html><html lang=\"en\"><head><meta charset=\"UTF-8\"><title>邮件正文模板</title></head><body>\n" +
                    "<div style=\"margin:0 auto;width:700px;height:500px\">\n" +
                    "<img src=\"cid:background.jpg\" style=\"width: 700px;\"/>\n" +
                    "<div style=\"margin:-600px 80px 0 170px;font-size:20px;\">\n" +
                    "<p style=\"color:mediumvioletred;\">周星星：</p>\n" +
                    "<p style=\"color:deeppink;\">\n" +
                    "人生的成功有千百种，您用劳动书写光荣，您用真情善待家人！今天是您的生日，请把心放松，静静地聆听我们的祝福：快乐、健康、幸福。\n" +
                    "</p>\n" +
                    "<p id=\"date\" style=\"text-align:right;margin-right: 100px\">" + time + "</p>\n" +
                    "</div>\n" +
                    "</div>\n" +
                    "</body></html>");
            mimeMessageHelper.setText(stringBuffer.toString(), true);
            mimeMessageHelper.addInline("background.jpg", new File(property + "/src/main/resources/img/background.jpg"));
            */
            
            /*附件*/
            if (mail.getMultipartFiles() != null) {
                for (MultipartFile multipartFile : mail.getMultipartFiles()) {
                    mimeMessageHelper.addAttachment(multipartFile.getOriginalFilename(), multipartFile);
                }
            }

            /*发送*/
            javaMailSender.send(mimeMessage);
            logger.info("发送成功：{}--->{}", mail.getFrom(), mail.getTo());
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            logger.debug("发送失败：{}--->{}", mail.getFrom(), mail.getTo());
            return false;
        }
    }
}

 四、MultipartFile 转 File 工具类

import org.springframework.stereotype.Component;
import org.springframework.web.multipart.MultipartFile;

import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;

@Component
public class MultipartFileToFile {
    /**
     * MultipartFile 转 File
     *
     * @param file
     * @throws Exception
     */
    public File multipartFileToFiles(MultipartFile file) throws Exception {

        File toFile = null;
        if (file.equals("") || file.getSize() <= 0) {
            file = null;
        } else {
            InputStream ins = null;
            ins = file.getInputStream();
            toFile = new File(file.getOriginalFilename());
            inputStreamToFile(ins, toFile);
            ins.close();
        }
        return toFile;
    }

    //获取流文件
    private void inputStreamToFile(InputStream ins, File file) {
        try {
            OutputStream os = new FileOutputStream(file);
            int bytesRead = 0;
            byte[] buffer = new byte[8192];
            while ((bytesRead = ins.read(buffer, 0, 8192)) != -1) {
                os.write(buffer, 0, bytesRead);
            }
            os.close();
            ins.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 删除本地临时文件
     *
     * @param file
     */
    public void delteTempFile(File file) {
        if (file != null) {
            File del = new File(file.toURI());
            del.delete();
        }
    }

}

                Leslie Cheung 随笔