java 发送简单邮件（不带附件）

引入依赖

邮件实体类

可用邮件服务器地址（网易为例）

邮件工具类

import com.me.beans.Mail;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.mail.EmailException;
import org.apache.commons.mail.HtmlEmail;

import java.util.HashSet;
import java.util.Set;

@Slf4j
public class MailUtil {

    public static boolean send(Mail mail) {

        // 发送者邮箱
        String from = "@163.com";
        // 发送者授权码（第三方客户端时用密码会报550 User has no permission这样的错误，需要去授权）
        String pass = "";
        // 邮件服务器端口
        int port = 25; // SMTP服务器
        // 邮件服务器地址
        String host = "smtp.163.com";
        // 昵称
        String nickname = "";

        HtmlEmail email = new HtmlEmail();

        try {
            email.setHostName(host);
            email.setCharset("UTF-8");
            for (String str : mail.getReceivers()) {
                email.addTo(str);
            }
            email.setFrom(from, nickname);
            email.setSmtpPort(port);
            email.setAuthentication(from, pass);
            email.setSubject(mail.getSubject());
            email.setMsg(mail.getMessage());
            email.send();
            log.info("{} 发送邮件到 {}", from, StringUtils.join(mail.getReceivers(), ","));
            return true;
        } catch (EmailException e) {
            log.error(from + "发送邮件到" + StringUtils.join(mail.getReceivers(), ",") + "失败", e);
            return false;
        }
    }

    public static void main(String[] args) {
        Set<String> receivers = new HashSet<>();
        receivers.add("@qq.com");
        Mail mail = Mail.builder().subject("测试邮件").message("测试信息").receivers(receivers).build();
        send(mail);
    }

}