Java 超简单实现发送邮件（可动态控制发送人数）

package quartz;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

/**
 *
 * @author DONG
 */
public class Util{
    public static final String format = "HH:mm";
    public static final SimpleDateFormat sdf = new SimpleDateFormat(format);
    public static String content = "以下电桩断网已超过1小时" +"【"+ sdf.format(new Date())+"】";//发送邮件内容
    public static Date lastSend = null;
    
    public static List getEmailList(){
        return getList("emails.txt");
    }
    
    public static List getList(String fileName){
        try{
            InputStream is = Util.class.getResourceAsStream(fileName);
            InputStreamReader isr = new InputStreamReader(is);
            BufferedReader br = new BufferedReader(isr);
            List list = new ArrayList();
            String line = "";
            while( (line = br.readLine()) != null ){
                if(!"".equals(line.trim())) list.add(line);
            }
            br.close();
            isr.close();
            is.close();
            return list;
        }catch(Exception e){
            e.printStackTrace();
        }
        return null;
    }
}

public void run() {

            List<String> emails = Util.getEmailList();//获取邮件发送对象的集合
            if (emails.isEmpty()) {
                System.out.println("no email receiver");
                return;
            }
            String from = "********@sina.com";//用户名，登录邮箱的账号
            String psw = "**********";//密码
            String[] to = emails.toArray(new String[0]);
            Email email = Email.create()
                    .from(from).to(to)
                    .subject("电桩断网超时提醒")//邮件主题
                    .addText(Util.content);//邮件内容

            SmtpServer smtpServer = SmtpServer.create("smtp.sina.com")//调用新浪邮箱服务器
                    .authenticateWith(from, psw);

            SendMailSession session = smtpServer.createSession();
            session.open();
            session.sendMail(email);//执行发送
            session.close();

            System.out.println("--email send success. receivers: " + Arrays.deepToString(emails.toArray()));

        }