JavaMail发送邮件的小程序

首先加入jar包javax.mail.jar

package com.tideway.javamail;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Properties;

import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;

public class SendMail {
    //收件人地址
    private String to;
    //发件人地址
    private String from;
    //SMTP服务器地址
    private String smtpServer;
    //登录副武器的用户名
    private String username;
    //登陆服务器的密码
    private String password;
    //邮件主题
    private String subject;
    //邮件正文
    private String content;
    //记录所有附件文件的集合,本人没写附件
    List<String> list=new ArrayList<String>();
    
    public SendMail(){}
    
    /**
     * 初始化各属性构造器
     * @param to            收件人地址
     * @param from            发件人地址
     * @param smtpServer    SMTP服务器地址
     * @param username        服务器登录用户名
     * @param password        密码
     * @param subject        标题
     * @param content        内容
     */
    public SendMail(String to,String from,String smtpServer,String username,
            String password,String subject,String content){
        this.to=to;
        this.from=from;
        this.smtpServer=smtpServer;
        this.username=username;
        this.password=password;
        this.subject=subject;
        this.content=content;
    }

    public void setTo(String to) {
        this.to = to;
    }

    public void setFrom(String from) {
        this.from = from;
    }

    public void setSmtpServer(String smtpServer) {
        this.smtpServer = smtpServer;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public void setPassword(String password) {
        this.password = password;
    }
    public void setSubject(String subject) {
        this.subject = subject;
    }

    public void setContent(String content) {
        this.content = content;
    }
    //将附件文件名添加到List集合
    public void attachfile(String filename){
        
        list.add(filename);
    }
    
    public boolean send(){
        //创建Session需要的Properties对象
        Properties pro=new Properties();
        pro.put("mail.smtp.host", smtpServer);
        pro.put("mail.smtp.auth", "true");
        //创建Session对象
        Session session=Session.getDefaultInstance(pro,new Authenticator() {
            public javax.mail.PasswordAuthentication getPasswordAuthentication(){
                return new javax.mail.PasswordAuthentication(username, password);
                
            }
        });
        try {
            //构造MimeMessage并设置相关属性
            MimeMessage msg=new MimeMessage(session);
            //设置发件人地址
            msg.setFrom(new InternetAddress(from));
            //设置收件人
            InternetAddress[] address={new InternetAddress(to)};
            msg.setRecipients(Message.RecipientType.TO, address);
            //设置邮件主题
            msg.setSubject(subject);
            //构造Multipart
            Multipart mp=new MimeMultipart();
            //向mp添加正文
            MimeBodyPart mbpContent=new MimeBodyPart();
            mbpContent.setText(content);
            //将MimeBodyPart添加到Multipart容器中
            mp.addBodyPart(mbpContent);
            //附件附件附件附
            //没写附件
            
            
            //添加
            msg.setContent(mp);
            //设置发送时间
            msg.setSentDate(new Date());
            //发送
            Transport.send(msg);
            
            
        } catch (MessagingException e) {
            // TODO: handle exception
            e.printStackTrace();
            return false;
        }
        return true;
    }
    public static void main(String[] args) {
        SendMail sendmail=new SendMail();
        sendmail.setSmtpServer("smtp.163.com");
        //设置登录服务器用户名
        sendmail.setUsername("xxxxxxx");
        //163邮箱开授权码的写授权码，没开的写邮箱密码
        sendmail.setPassword("自己163邮箱授权码");
        //给谁发
        sendmail.setTo("xxxx@qq.com");
        
        sendmail.setFrom("xxxxxxx@163.com");
        
        sendmail.setSubject("你是一个不讲诚信的人");
        
        sendmail.setContent("我的海底捞，我的海底捞，我的海底捞。");
        
        if (sendmail.send()) {
            System.out.println("success!");
        }
    }
}

注意：上面程序中创建的Session实例，使用了Autherenticator的匿名内部类，通过该类完成了SMTP的认证，少数邮件服务器在使用SMTP服务时不需要安全认证，则直接如下书写即可。

//创建Session需要的Properties对象
        Properties pro=new Properties();
        pro.put("mail.smtp.host", smtpServer);
        pro.put("mail.smtp.auth", "false");//改成false.................
        //创建Session对象
        Session session=Session.getDefaultInstance(pro);