Java邮件推送案例如何开发

本文目录导读：

1. 添加依赖
2. 基础邮件发送实现
3. Spring Boot集成实现
4. 注意事项

我来为您详细介绍Java邮件推送功能的开发步骤和完整案例。

添加依赖

Maven项目（pom.xml）

<!-- JavaMail -->
<dependency>
    <groupId>com.sun.mail</groupId>
    <artifactId>javax.mail</artifactId>
    <version>1.6.2</version>
</dependency>
<!-- Spring Boot Starter Mail (如果使用Spring Boot) -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-mail</artifactId>
</dependency>

基础邮件发送实现

1 纯文本邮件

import javax.mail.*;
import javax.mail.internet.*;
import java.util.Properties;
public class SimpleMailSender {
    public static void sendTextEmail() throws MessagingException {
        // 1. 配置邮件服务器属性
        Properties props = new Properties();
        props.put("mail.smtp.host", "smtp.qq.com");  // SMTP服务器
        props.put("mail.smtp.port", "587");           // SMTP端口
        props.put("mail.smtp.auth", "true");          // 需要认证
        props.put("mail.smtp.starttls.enable", "true"); // 启用TLS
        // 2. 创建Session
        Session session = Session.getInstance(props, new Authenticator() {
            @Override
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication("your_email@qq.com", "authorization_code");
            }
        });
        // 3. 创建邮件消息
        Message message = new MimeMessage(session);
        message.setFrom(new InternetAddress("your_email@qq.com"));
        message.setRecipients(Message.RecipientType.TO, 
                              InternetAddress.parse("recipient@example.com"));
        message.setSubject("测试邮件");
        message.setText("这是一封测试邮件！");
        // 4. 发送邮件
        Transport.send(message);
        System.out.println("邮件发送成功！");
    }
}

2 HTML格式邮件

public class HtmlMailSender {
    public static void sendHtmlEmail() throws MessagingException {
        Properties props = new Properties();
        props.put("mail.smtp.host", "smtp.qq.com");
        props.put("mail.smtp.port", "587");
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.starttls.enable", "true");
        Session session = Session.getInstance(props, new Authenticator() {
            @Override
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication("your_email@qq.com", "authorization_code");
            }
        });
        Message message = new MimeMessage(session);
        message.setFrom(new InternetAddress("your_email@qq.com"));
        message.setRecipients(Message.RecipientType.TO, 
                              InternetAddress.parse("recipient@example.com"));
        message.setSubject("HTML格式邮件");
        // 创建HTML内容
        String htmlContent = "<html><body>"
                + "<h1>Hello!</h1>"
                + "<p>这是一封 <b>HTML</b> 格式的邮件。</p>"
                + "<p>当前时间：" + new java.util.Date() + "</p>"
                + "</body></html>";
        message.setContent(htmlContent, "text/html; charset=UTF-8");
        Transport.send(message);
        System.out.println("HTML邮件发送成功！");
    }
}

3 带附件邮件

import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.FileDataSource;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMultipart;
public class AttachmentMailSender {
    public static void sendWithAttachment() throws MessagingException {
        Properties props = new Properties();
        props.put("mail.smtp.host", "smtp.qq.com");
        props.put("mail.smtp.port", "587");
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.starttls.enable", "true");
        Session session = Session.getInstance(props, new Authenticator() {
            @Override
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication("your_email@qq.com", "authorization_code");
            }
        });
        // 创建邮件
        Message message = new MimeMessage(session);
        message.setFrom(new InternetAddress("your_email@qq.com"));
        message.setRecipients(Message.RecipientType.TO, 
                              InternetAddress.parse("recipient@example.com"));
        message.setSubject("带附件的邮件");
        // 创建邮件体
        Multipart multipart = new MimeMultipart();
        // 添加文本内容
        MimeBodyPart textPart = new MimeBodyPart();
        textPart.setText("请查收附件", "UTF-8");
        multipart.addBodyPart(textPart);
        // 添加附件
        MimeBodyPart attachmentPart = new MimeBodyPart();
        DataSource source = new FileDataSource("path/to/your/file.pdf");
        attachmentPart.setDataHandler(new DataHandler(source));
        attachmentPart.setFileName("document.pdf");
        multipart.addBodyPart(attachmentPart);
        message.setContent(multipart);
        Transport.send(message);
        System.out.println("带附件邮件发送成功！");
    }
}

Spring Boot集成实现

1 配置文件（application.yml）

spring:
  mail:
    host: smtp.qq.com
    port: 587
    username: your_email@qq.com
    password: authorization_code  # 授权码
    protocol: smtp
    properties:
      mail:
        smtp:
          auth: true
          starttls:
            enable: true
          connectiontimeout: 5000
          timeout: 5000
          writetimeout: 5000

2 邮件服务类

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.mail.SimpleMailMessage;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.MimeMessageHelper;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;
import javax.mail.internet.MimeMessage;
import java.io.File;
@Service
public class EmailService {
    @Autowired
    private JavaMailSender mailSender;
    // 发送简单文本邮件
    public void sendSimpleEmail(String to, String subject, String content) {
        SimpleMailMessage message = new SimpleMailMessage();
        message.setTo(to);
        message.setSubject(subject);
        message.setText(content);
        mailSender.send(message);
    }
    // 发送HTML邮件
    public void sendHtmlEmail(String to, String subject, String htmlContent) 
            throws MessagingException {
        MimeMessage message = mailSender.createMimeMessage();
        MimeMessageHelper helper = new MimeMessageHelper(message, true, "UTF-8");
        helper.setTo(to);
        helper.setSubject(subject);
        helper.setText(htmlContent, true);  // true表示HTML格式
        mailSender.send(message);
    }
    // 发送带附件的邮件
    public void sendEmailWithAttachment(String to, String subject, 
                                        String content, File attachment) 
            throws MessagingException {
        MimeMessage message = mailSender.createMimeMessage();
        MimeMessageHelper helper = new MimeMessageHelper(message, true);
        helper.setTo(to);
        helper.setSubject(subject);
        helper.setText(content, true);
        helper.addAttachment(attachment.getName(), attachment);
        mailSender.send(message);
    }
    // 发送批量邮件
    public void sendBulkEmails(String[] toList, String subject, String content) {
        for (String to : toList) {
            SimpleMailMessage message = new SimpleMailMessage();
            message.setTo(to);
            message.setSubject(subject);
            message.setText(content);
            mailSender.send(message);
        }
    }
}

3 邮件模板工具类

import java.util.Map;
public class EmailTemplateUtil {
    public static String buildWelcomeEmail(String username) {
        return "<!DOCTYPE html>" +
               "<html>" +
               "<head><meta charset='UTF-8'></head>" +
               "<body>" +
               "<div style='background-color: #f4f4f4; padding: 20px;'>" +
               "<h2>欢迎 " + username + "!</h2>" +
               "<p>感谢您在[公司名称]注册账号。</p>" +
               "<p>请点击以下链接激活您的账号：</p>" +
               "<a href='http://example.com/activate?token=xxx'>激活账号</a>" +
               "</div>" +
               "</body>" +
               "</html>";
    }
    public static String buildResetPasswordEmail(String resetLink) {
        return "<!DOCTYPE html>" +
               "<html>" +
               "<head><meta charset='UTF-8'></head>" +
               "<body>" +
               "<div style='background-color: #f4f4f4; padding: 20px;'>" +
               "<h3>密码重置请求</h3>" +
               "<p>我们收到您的密码重置请求。</p>" +
               "<p>请点击以下链接重置密码（24小时内有效）：</p>" +
               "<a href='" + resetLink + "'>重置密码</a>" +
               "<p>如果您没有请求重置密码，请忽略此邮件。</p>" +
               "</div>" +
               "</body>" +
               "</html>";
    }
}

4 Controller示例

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;
@RestController
@RequestMapping("/email")
public class EmailController {
    @Autowired
    private EmailService emailService;
    @PostMapping("/send")
    public String sendEmail(@RequestParam String to,
                           @RequestParam String subject,
                           @RequestParam String content) {
        try {
            emailService.sendSimpleEmail(to, subject, content);
            return "邮件发送成功";
        } catch (Exception e) {
            return "邮件发送失败: " + e.getMessage();
        }
    }
    @PostMapping("/send-html")
    public String sendHtmlEmail(@RequestParam String to,
                               @RequestParam String subject,
                               @RequestParam String htmlContent) {
        try {
            emailService.sendHtmlEmail(to, subject, htmlContent);
            return "HTML邮件发送成功";
        } catch (Exception e) {
            return "邮件发送失败: " + e.getMessage();
        }
    }
}

注意事项

1 邮箱配置

• 需要开启SMTP服务
• 使用授权码而非登录密码
• 常见邮箱SMTP配置：

2 异常处理建议

@ExceptionHandler(MessagingException.class)
public ResponseEntity<String> handleMailException(MessagingException e) {
    // 记录日志
    logger.error("邮件发送失败", e);
    // 返回错误信息
    return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR)
            .body("邮件发送失败: " + e.getMessage());
}

3 异步发送（推荐）

@Async
public CompletableFuture<Boolean> sendEmailAsync(String to, String subject, String content) {
    try {
        sendSimpleEmail(to, subject, content);
        return CompletableFuture.completedFuture(true);
    } catch (Exception e) {
        return CompletableFuture.completedFuture(false);
    }
}

这个实现包含了基本的邮件发送功能、Spring Boot集成、模板使用和最佳实践，根据实际需求，您可以进一步扩展功能，如邮件队列、重试机制等。