1. service层的实现类

package cn.*.*.service.impl;

import cn.multidata.credit.common.mail.MailSenderInfo;
import cn.multidata.credit.common.mail.SimpleMailSender;
import cn.multidata.credit.service.SendMailService;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;

@Service
public class SendMailServiceImpl implements SendMailService {
    @Value("${mailServerHost}")
    private String mailServerHost;
    @Value("${mailServerPort}")
    private String mailServerPort;
    @Value("${userName}")
    private String userName;
    @Value("${password}")
    private String password;
    @Value("${tos}")
    private String tos;

    @Override
    public void send(String title,String content) {
        MailSenderInfo mailSenderInfo = new MailSenderInfo();
        mailSenderInfo.setMailServerHost(mailServerHost);
        mailSenderInfo.setMailServerPort(mailServerPort);
        mailSenderInfo.setValidate(true);
        mailSenderInfo.setUserName(userName);
        mailSenderInfo.setPassword(password);//您的邮箱密码
        mailSenderInfo.setFromAddress(userName);
        String [] to = tos.split(",");
        mailSenderInfo.setToAddress(to);
        mailSenderInfo.setSubject(title);
        mailSenderInfo.setContent(content);
        //这个类主要来发送邮件
        SimpleMailSender sms = new SimpleMailSender();
        sms.sendTextMail(mailSenderInfo);//发送文体格式
    }
}

2. 邮件发送器类

package cn.*.*.common.mail;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Properties;
import javax.mail.Address;
import javax.mail.BodyPart;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;

/**
 * 简单邮件（不带附件的邮件）发送器
 */
public class SimpleMailSender  {
    /**
     * 以文本格式发送邮件
     * @param mailInfo 待发送的邮件的信息
     */
    public boolean sendTextMail(MailSenderInfo mailInfo) {
        // 判断是否需要身份认证
        MyAuthenticator authenticator = null;
        Properties pro = mailInfo.getProperties();
        if (mailInfo.isValidate()) {
            // 如果需要身份认证，则创建一个密码验证器
            authenticator = new MyAuthenticator(mailInfo.getUserName(), mailInfo.getPassword());
        }
        // 根据邮件会话属性和密码验证器构造一个发送邮件的session
        Session sendMailSession = Session.getDefaultInstance(pro,authenticator);
        try {
            // 根据session创建一个邮件消息
            Message mailMessage = new MimeMessage(sendMailSession);
            // 创建邮件发送者地址
            Address from = new InternetAddress(mailInfo.getFromAddress());
            // 设置邮件消息的发送者
            mailMessage.setFrom(from);
            // 创建邮件的接收者地址，并设置到邮件消息
            Address[] tos = new Address[mailInfo.getToAddress().length];
            for (int i = 0;i<mailInfo.getToAddress().length;i++) {
                tos[i] = new InternetAddress(mailInfo.getToAddress()[i]);
            }
            mailMessage.setRecipients(Message.RecipientType.TO,tos);
            // 设置邮件消息的主题
            mailMessage.setSubject(mailInfo.getSubject());
            // 设置邮件消息发送的时间
            mailMessage.setSentDate(new Date());
            // 设置邮件消息的主要内容
            String mailContent = mailInfo.getContent();
            mailMessage.setText(mailContent);
            // 发送邮件
            Transport.send(mailMessage);
            return true;
        } catch (MessagingException ex) {
            ex.printStackTrace();
        }
        return false;
    }

    /**
     * 以HTML格式发送邮件
     * @param mailInfo 待发送的邮件信息
     */
    public static boolean sendHtmlMail(MailSenderInfo mailInfo){
        // 判断是否需要身份认证
        MyAuthenticator authenticator = null;
        Properties pro = mailInfo.getProperties();
        //如果需要身份认证，则创建一个密码验证器
        if (mailInfo.isValidate()) {
            authenticator = new MyAuthenticator(mailInfo.getUserName(), mailInfo.getPassword());
        }
        // 根据邮件会话属性和密码验证器构造一个发送邮件的session
        Session sendMailSession = Session.getDefaultInstance(pro,authenticator);
        try {
            // 根据session创建一个邮件消息
            Message mailMessage = new MimeMessage(sendMailSession);
            // 创建邮件发送者地址
            Address from = new InternetAddress(mailInfo.getFromAddress());
            // 设置邮件消息的发送者
            mailMessage.setFrom(from);
            // 创建邮件的接收者地址，并设置到邮件消息中
            Address[] tos = new Address[mailInfo.getToAddress().length];
            for (int i = 0;i<mailInfo.getToAddress().length;i++) {
                tos[i] = new InternetAddress(mailInfo.getToAddress()[i]);
            }
            mailMessage.setRecipients(Message.RecipientType.TO,tos);
            // 设置邮件消息的主题
            mailMessage.setSubject(mailInfo.getSubject());
            // 设置邮件消息发送的时间
            mailMessage.setSentDate(new Date());
            // MiniMultipart类是一个容器类，包含MimeBodyPart类型的对象
            Multipart mainPart = new MimeMultipart();
            // 创建一个包含HTML内容的MimeBodyPart
            BodyPart html = new MimeBodyPart();
            // 设置HTML内容
            html.setContent(mailInfo.getContent(), "text/html; charset=utf-8");
            mainPart.addBodyPart(html);
            // 将MiniMultipart对象设置为邮件内容
            mailMessage.setContent(mainPart);
            // 发送邮件
            Transport.send(mailMessage);
            return true;
        } catch (MessagingException ex) {
            ex.printStackTrace();
        }
        return false;
    }
}

3.实体类

package cn.*.*.common.mail;

import java.util.Properties;
public class MailSenderInfo {
    // 发送邮件的服务器的IP和端口
    private String mailServerHost;
    private String mailServerPort = "25";
    // 邮件发送者的地址
    private String fromAddress;
    // 邮件接收者的地址
    private String [] toAddress;
    // 登陆邮件发送服务器的用户名和密码
    private String userName;
    private String password;
    // 是否需要身份验证
    private boolean validate = false;
    // 邮件主题
    private String subject;
    // 邮件的文本内容
    private String content;
    // 邮件附件的文件名
    private String[] attachFileNames;
    /**
     * 获得邮件会话属性
     */
    public Properties getProperties(){
        Properties p = new Properties();
        p.put("mail.smtp.host", this.mailServerHost);
        p.put("mail.smtp.port", this.mailServerPort);
        p.put("mail.smtp.auth", validate ? "true" : "false");
        return p;
    }
    public String getMailServerHost() {
        return mailServerHost;
    }
    public void setMailServerHost(String mailServerHost) {
        this.mailServerHost = mailServerHost;
    }
    public String getMailServerPort() {
        return mailServerPort;
    }
    public void setMailServerPort(String mailServerPort) {
        this.mailServerPort = mailServerPort;
    }
    public boolean isValidate() {
        return validate;
    }
    public void setValidate(boolean validate) {
        this.validate = validate;
    }
    public String[] getAttachFileNames() {
        return attachFileNames;
    }
    public void setAttachFileNames(String[] fileNames) {
        this.attachFileNames = fileNames;
    }
    public String getFromAddress() {
        return fromAddress;
    }
    public void setFromAddress(String fromAddress) {
        this.fromAddress = fromAddress;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }

    public String[] getToAddress() {
        return toAddress;
    }

    public void setToAddress(String[] toAddress) {
        this.toAddress = toAddress;
    }

    public String getUserName() {
        return userName;
    }
    public void setUserName(String userName) {
        this.userName = userName;
    }
    public String getSubject() {
        return subject;
    }
    public void setSubject(String subject) {
        this.subject = subject;
    }
    public String getContent() {
        return content;
    }
    public void setContent(String textContent) {
        this.content = textContent;
    }
}

4

package cn.*.*.common.mail;

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

public class MyAuthenticator extends Authenticator {
    String userName=null;
    String password=null;

    public MyAuthenticator(){
    }
    public MyAuthenticator(String username, String password) {
        this.userName = username;
        this.password = password;
    }
    protected PasswordAuthentication getPasswordAuthentication(){
        return new PasswordAuthentication(userName, password);
    }
}

5.测试类

package cn.*.*.common.mail;

public class SendMail {
    public static void main(String[] args){
        //这个类主要是设置邮件
        MailSenderInfo mailInfo = new MailSenderInfo();
        mailInfo.setMailServerHost("smtp.qq.com");
        mailInfo.setMailServerPort("25");
        mailInfo.setValidate(true);
        mailInfo.setUserName("3056576606@qq.com");
        mailInfo.setPassword("Js2015UHB!Q");//您的邮箱密码
        mailInfo.setFromAddress("3056576606@qq.com");
        String [] tos = new String[]{"3056576606@qq.com","14472656@qq.com"};
        mailInfo.setToAddress(tos);
        mailInfo.setSubject("test jsj send mail11");
        mailInfo.setContent("设置邮箱内容 如http://www.guihua.org 中国桂花网 是中国最大桂花网站==");
        //这个类主要来发送邮件
        SimpleMailSender sms = new SimpleMailSender();
        sms.sendTextMail(mailInfo);//发送文体格式
//        sms.sendHtmlMail(mailInfo);//发送html格式
    }
}

6.maven引入jar包

<dependency>
    <groupId>com.sun.mail</groupId>
    <artifactId>javax.mail</artifactId>
</dependency>