项目结构：
[img]http://dl.iteye.com/upload/picture/pic/124101/bfa29927-44c2-35be-be5e-c21b43d61b7b-thumb.jpg[/img]
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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