java 发送邮件简略实例

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();    }    }

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");    }}