JAVA发送邮件的DEMO

最近有朋友问邮件怎么发送，就简单写了个demo，因为懒得找jar包，所以项目是创建的maven工程，具体的maven引用的jar如下：

<dependency>
    <groupId>com.sun.mail</groupId>
    <artifactId>javax.mail</artifactId>
    <version>1.4.4</version>
</dependency>

<!-- https://mvnrepository.com/artifact/javax.mail/mail -->
<dependency>
    <groupId>javax.mail</groupId>
    <artifactId>mail</artifactId>
    <version>1.4</version>
</dependency>

然后代码见下：

因为QQ是https所以中间多了一段，还有就是如果自己搭的邮件服务器可以填写密码，而不用授权码了，这里我是用的QQ邮箱，所以邮箱要先开启SMTP/POP3服务

package com.allan.until;

import java.util.Properties;

import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

import com.sun.mail.util.MailSSLSocketFactory;

public class MailUtil  {
    private String email;// 收件人邮箱
    private String code;// 激活码

    public MailUtil(String email, String code) {
        this.email = email;
        this.code = code;
    }

    public void sendMail() {
        // 1.创建连接对象javax.mail.Session
        // 2.创建邮件对象 javax.mail.Message
        // 3.发送一封激活邮件
        String from = "XXX@qq.com";// 发件人电子邮箱
        String host = "smtp.qq.com"; // 指定发送邮件的主机smtp.qq.com(QQ)|smtp.163.com(网易)

        //Properties properties = System.getProperties();// 获取系统属性
        Properties properties =new Properties();

        properties.setProperty("mail.smtp.host", host);// 设置邮件服务器
        properties.setProperty("mail.smtp.auth", "true");// 打开认证

        try {
            //QQ邮箱需要下面这段代码，163邮箱不需要
            MailSSLSocketFactory sf = new MailSSLSocketFactory();
            sf.setTrustAllHosts(true);
            properties.put("mail.smtp.ssl.enable", "true");
            properties.put("mail.smtp.ssl.socketFactory", sf);

            // 1.获取默认session对象
            Session session = Session.getDefaultInstance(properties, new Authenticator() {
                public PasswordAuthentication getPasswordAuthentication() {
                    return new PasswordAuthentication("XXX@qq.com", "XXX"); // 发件人邮箱账号、授权码
                }
            });

            // 2.创建邮件对象
            Message message = new MimeMessage(session);
            // 2.1设置发件人
            message.setFrom(new InternetAddress(from));
            // 2.2设置接收人
            message.addRecipient(Message.RecipientType.TO, new InternetAddress(email));
            // 2.3设置邮件主题
            message.setSubject("账号激活");
            // 2.4设置邮件内容
            String content = "验证码："+ code;
            message.setContent(content, "text/html;charset=UTF-8");
            // 3.发送邮件
            Transport.send(message);
            System.out.println("邮件成功发送!");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}