java 实现发送邮件功能

最近工作项目中需要使用到邮件功能，参考网上的文章，实现了一个基于java的邮件发送功能；直接上代码：

1、依赖

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

2、身份认证bean

import javax.mail.Authenticator;
import javax.mail.PasswordAuthentication;

/**
 * 身份认证
 */
public class Auth extends Authenticator {

    private String username = "";
    private String password = "";

    public Auth(String username, String password) {
        this.username = username;
        this.password = password;
    }

    @Override
    public PasswordAuthentication getPasswordAuthentication() {
        return new PasswordAuthentication(username, password);
    }
}

3、邮件发送操作类

import com.mail.java.demo.bean.Auth;

import javax.mail.Message;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.util.Date;
import java.util.List;
import java.util.Properties;

/**
 * 邮件相关操作类
 */
public class MailUtil {

    /**
     * 发送邮件
     *
     * @param user     发件人邮箱
     * @param password 授权码（注意不是邮箱登录密码）
     * @param host     服务器
     * @param port     端口
     * @param from     发件人
     * @param to       接收者
     * @param cc       抄送
     * @param subject  邮件主题
     * @param content  邮件内容
     * @return success 发送成功 failure 发送失败
     * @throws Exception
     */
    public static String sendMail(String user, String password, String host, String port,
                                  String from, List<String> to, List<String> cc, String subject, String content)
            throws Exception {
        if (to.isEmpty()) {
            return "收件人不能为空";
        }

        InternetAddress[] toAddress = new InternetAddress[to.size()];
        for (int i = 0; i < to.size(); i++) {
            toAddress[i] = new InternetAddress(to.get(i));
        }
        InternetAddress[] ccAddress = new InternetAddress[cc.size()];
        for (int i = 0; i < cc.size(); i++) {
            ccAddress[i] = new InternetAddress(cc.get(i));
        }

        Properties props = System.getProperties();
        props.put("mail.smtp.host", host);
        props.put("mail.smtp.port", port);
        props.put("mail.smtp.auth", "true");
        props.setProperty("mail.smtp.ssl.enable", "true");//开启ssl，根据使用的服务器判断是否开启
        props.setProperty("mail.transport.protocol", "smtp");

        Auth auth = new Auth(user, password);
        Session session = Session.getInstance(props, auth);
        session.setDebug(true);
        try {
            MimeMessage message = new MimeMessage(session);
            message.setFrom(new InternetAddress(from));
            message.addRecipients(Message.RecipientType.TO, toAddress);
            message.addRecipients(Message.RecipientType.CC, ccAddress);
            message.setSubject(subject);
            message.setContent(content, "text/html;charset=utf-8");
            message.setSentDate(new Date(1614667200));//发送时间
            Transport.send(message);
        } catch (Exception e) {
            e.printStackTrace();
            return "发送异常" + e;
        }
        return "发送成功";
    }
}

项目demo： https://github.com/helloEveryoneByChenglong/java_mail