5、SpringBoot 發送郵件

簡單幾步，實現在spring boot中發送郵件：

1、引入依賴：

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

2、application.yml中配置郵件相關的參數：

spring:
    mail:
        host: smtp.qq.com
        username: [email protected]
        password: zhoumin
        properties:
            mail:
                smtp:
                    auth: true
                    starttls:
                        enable: true
                    required: true

3、郵件service代碼：

@Service  
public class MailService {  
    private final Logger logger = LoggerFactory.getLogger(this.getClass());  
      
    @Autowired  
    private JavaMailSender sender;  
      
    @Value("${spring.mail.username}")  
    private String from;  
      
    /**
     * 發送純文本的簡單郵件
     * @param to
     * @param subject
     * @param content
     */  
    public void sendSimpleMail(String to, String subject, String content){  
        SimpleMailMessage message = new SimpleMailMessage();  
        message.setFrom(from);  
        message.setTo(to);  
        message.setSubject(subject);  
        message.setText(content);  
  
        try {  
            sender.send(message);  
            logger.info("簡單郵件已經發送。");  
        } catch (Exception e) {  
            logger.error("發送簡單郵件時發生異常！", e);  
        }  
    }  
      
    /**
     * 發送html格式的郵件
     * @param to
     * @param subject
     * @param content
     */  
    public void sendHtmlMail(String to, String subject, String content){  
        MimeMessage message = sender.createMimeMessage();  
  
        try {  
            //true表示需要創建一個multipart message  
            MimeMessageHelper helper = new MimeMessageHelper(message, true);  
            helper.setFrom(from);  
            helper.setTo(to);  
            helper.setSubject(subject);  
            helper.setText(content, true);  
  
            sender.send(message);  
            logger.info("html郵件已經發送。");  
        } catch (MessagingException e) {  
            logger.error("發送html郵件時發生異常！", e);  
        }  
    }  
      
    /**
     * 發送帶附件的郵件
     * @param to
     * @param subject
     * @param content
     * @param filePath
     */  
    public void sendAttachmentsMail(String to, String subject, String content, String filePath){  
        MimeMessage message = sender.createMimeMessage();  
  
        try {  
            //true表示需要創建一個multipart message  
            MimeMessageHelper helper = new MimeMessageHelper(message, true);  
            helper.setFrom(from);  
            helper.setTo(to);  
            helper.setSubject(subject);  
            helper.setText(content, true);  
  
            FileSystemResource file = new FileSystemResource(new File(filePath));  
            String fileName = filePath.substring(filePath.lastIndexOf(File.separator));  
            helper.addAttachment(fileName, file);  
              
            sender.send(message);  
            logger.info("帶附件的郵件已經發送。");  
        } catch (MessagingException e) {  
            logger.error("發送帶附件的郵件時發生異常！", e);  
        }  
    }  
      
    /**
     * 發送嵌入靜態資源（一般是圖片）的郵件
     * @param to
     * @param subject
     * @param content 郵件內容，需要包括一個靜態資源的id，比如：<img src=\"cid:rscId01\" >
     * @param rscPath 靜態資源路徑和文件名
     * @param rscId 靜態資源id
     */  
    public void sendInlineResourceMail(String to, String subject, String content, String rscPath, String rscId){  
        MimeMessage message = sender.createMimeMessage();  
  
        try {  
            //true表示需要創建一個multipart message  
            MimeMessageHelper helper = new MimeMessageHelper(message, true);  
            helper.setFrom(from);  
            helper.setTo(to);  
            helper.setSubject(subject);  
            helper.setText(content, true);  
  
            FileSystemResource res = new FileSystemResource(new File(rscPath));  
            helper.addInline(rscId, res);  
              
            sender.send(message);  
            logger.info("嵌入靜態資源的郵件已經發送。");  
        } catch (MessagingException e) {  
            logger.error("發送嵌入靜態資源的郵件時發生異常！", e);  
        }  
    }  
}  

4、單元測試代碼：

public class MailTests extends BasicUtClass{
    @Autowired
    private MailService mailService;
    
    private String to = "[email protected]";
    
    @Test
    public void sendSimpleMail() {
        mailService.sendSimpleMail(to, "主題：簡單郵件", "測試郵件內容");
    }
    
    @Autowired
    VelocityEngine velocityEngine;
    
    @Test
    public void sendHtmlMail() {
        Map<String, Object> model = new HashMap<String, Object>();
        model.put("time", XDateUtils.nowToString());
        model.put("message", "這是測試的內容。。。");
        model.put("toUserName", "張三");
        model.put("fromUserName", "老許");
        String content = VelocityEngineUtils.mergeTemplateIntoString(velocityEngine, "welcome.vm", "UTF-8", model);
        
        mailService.sendHtmlMail(to, "主題：html郵件", content);
    }

    @Test
    public void sendAttachmentsMail() {
        mailService.sendAttachmentsMail(to, "主題：帶附件的郵件", "有附件，請查收！", "C:\\Users\\Xu\\Desktop\\csdn\\1.png");
    }
    
    @Test
    public void sendInlineResourceMail() {
        String rscId = "rscId001";
        mailService.sendInlineResourceMail(to,
                "主題：嵌入靜態資源的郵件",
                "<html><body>這是有嵌入靜態資源：<img src=\'cid:" + rscId + "\' ></body></html>",
                "C:\\Users\\Xu\\Desktop\\csdn\\1.png",
                rscId);
    }
}

5、注意事項；

QQ郵箱需要開通相應權限；
設置- 帳戶- POP3/IMAP/SMTP/Exchange/CardDAV/CalDAV服務