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 = "gaojunwei@163.com";

//要发送的邮箱

String to = "gaojunwei@qq.com";

//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,"gaojunwei@163.com","123456");

transport.sendMessage(msg,msg.getAllRecipients());

transport.close();

System.out.println("邮件发送成功");

}

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