How to realize the simple function of mass mail sending based on Java
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Pom files introduce third-party dependencies on javax.mail mail 1.4 org.projectlombok lombok The true java code is as follows: import lombok.Data Import javax.mail.Message.RecipientType;import javax.mail.MessagingException;import javax.mail.Session;import javax.mail.Transport;import javax.mail.internet.InternetAddress;import javax.mail.internet.MimeMessage;import java.io.IOException;import java.io.InputStream;import java.util.ArrayList;import java.util.List;import java.util.Properties; / * Created by tarzan liu on 2021-5-9. * / public abstract class EmailUtil {private static final Session session; private static final EmailAuthenticator authenticator Static {InputStream inputStream = null; try {inputStream = EmailUtil.class.getResourceAsStream ("/ email.properties"); Properties properties = new Properties (); properties.load (inputStream); authenticator = new EmailAuthenticator (); String username = properties.getProperty ("email.username"); authenticator.setUsername (username) String password = properties.getProperty ("email.password"); authenticator.setPassword (password); String smtpHostName = "smtp." + username.split ("@") [1]; properties.put ("mail.smtp.auth", "true"); properties.put ("mail.smtp.host", smtpHostName); session = Session.getInstance (properties, authenticator) } catch (Exception e) {throw new RuntimeException ("init error.");} finally {if (inputStream! = null) {try {inputStream.close ();} catch (IOException e) {e.printStackTrace () }} private EmailUtil () {} / * Group email method * / private static void massSend (List recipients, SimpleEmail email) throws MessagingException {MimeMessage message = new MimeMessage (session); message.setFrom (new InternetAddress (authenticator.getUsername (); InternetAddress [] addresses = new InternetAddress [recipients.size ()] For (int index = 0; index < recipients.size (); index + +) {addresses [index] = new InternetAddress (recipients.get (index));} message.setRecipients (RecipientType.TO, addresses); message.setSubject (email.getSubject ()); message.setContent (email.getContent (), "text/html;charset=utf-8"); Transport.send (message) } / * send email * / public static void send (String recipient, SimpleEmail email) throws MessagingException {List recipients = new ArrayList (); recipients.add (recipient); massSend (recipients, email);} / / you can create a separate class @ Data public static class SimpleEmail {private String subject; private String content } public static void main (String [] args) throws Exception {SimpleEmail simpleEmail = new SimpleEmail (); simpleEmail.setSubject ("have you studied today?") ; simpleEmail.setContent ("have you written a blog today"); send ("1334512682@qq.com", simpleEmail);}}
Email.properties system mailbox configuration
Email.username=###@163.com
Email.password=###
Your email account and password, you can also omit the configuration file, directly write the account password in the code.
Run the test
Right-click run to run the main method.
Will send the mailbox bound to Wechat, but also can achieve Wechat reminder function!
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