java 发送邮件简单实例

项目结构：

全部代码：
EmailAuthenticator.java

package com.gjw.test;

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

public class EmailAuthenticator extends Authenticator
{
    private String username;
    private String userpsd;
    public EmailAuthenticator(String username, String userpsd)
    {
        this.username = username;
        this.userpsd = userpsd;
    }
    public String getUsername()
    {
        return username;
    }
    public void setUsername(String username)
    {
        this.username = username;
    }
    public String getUserpsd()
    {
        return userpsd;
    }
    public void setUserpsd(String userpsd)
    {
        this.userpsd = userpsd;
    }
    @Override
    protected PasswordAuthentication getPasswordAuthentication()
    {
        // TODO Auto-generated method stub
        return super.getPasswordAuthentication();
    }
    
}

MailSender.java

package com.gjw.test;

import java.util.Properties;
import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
public class MailSender
{
    public static void main(String[] args) throws Exception
    {
        //这是邮件服务器地址
        String smtp = "smtp.163.com";
        //用户邮箱地址
          //用自己的邮箱啊
        String from = "[email protected]";
        //要发送的邮箱
        String to = "[email protected]";
        //构造用户身份验证验证对象，参数为用户名和口令
        EmailAuthenticator auth = new EmailAuthenticator("gaojunwei","123456");
        //获取系统属性对象
        Properties props = System.getProperties();
        //设置邮件服务器和是否身份验证
        props.put("mail.smtp.host", smtp);
        /*  如果写成这样 props.put("mail.smtp.auth", true);
         *  会爆 com.sun.mail.smtp.SMTPSendFailedException:异常
         *  应该写成 props.put("mail.smtp.auth", "true");
         * */
        props.put("mail.smtp.auth", "true");
        //获得Session对象
        Session session = Session.getInstance(props,(Authenticator)auth);
        //以session作为参数建立MimeMessage对象
        //这里Mime是支持该协议的类，用来描述邮件的内容
        MimeMessage msg = new MimeMessage(session);
        msg.setFrom(new InternetAddress(from));
        msg.addRecipient(Message.RecipientType.TO,new InternetAddress(to));
        msg.setSubject("只是测试");
        String s = "测试内容";
        msg.setText(s);
        //设置好MimeMessage后，从Session中建立Transport对象
        //Transport对象用于发送邮件信息，getTransport的参数
        //表明发送邮件使用的协议。
        Transport transport = session.getTransport("smtp");
        transport.connect(smtp,"[email protected]","123456");
        transport.sendMessage(msg,msg.getAllRecipients());
        transport.close();
        System.out.println("邮件发送成功");
    }

}

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