通过javax.mail发送邮件(示例gmail、qq)

最近学习了一下javax.mail，想通过gmail邮箱发送邮件到qq邮箱。但是由于gmail的两步验证，一直授权无法通过。
错误如下：

DEBUG: JavaMail version 1.4.7DEBUG: successfully loaded resource: /META-INF/javamail.default.providersDEBUG: Tables of loaded providersDEBUG: Providers Listed By Class Name: {com.sun.mail.smtp.SMTPSSLTransport=javax.mail.Provider[TRANSPORT,smtps,com.sun.mail.smtp.SMTPSSLTransport,Oracle], com.sun.mail.smtp.SMTPTransport=javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Oracle], com.sun.mail.imap.IMAPSSLStore=javax.mail.Provider[STORE,imaps,com.sun.mail.imap.IMAPSSLStore,Oracle], com.sun.mail.pop3.POP3SSLStore=javax.mail.Provider[STORE,pop3s,com.sun.mail.pop3.POP3SSLStore,Oracle], com.sun.mail.imap.IMAPStore=javax.mail.Provider[STORE,imap,com.sun.mail.imap.IMAPStore,Oracle], com.sun.mail.pop3.POP3Store=javax.mail.Provider[STORE,pop3,com.sun.mail.pop3.POP3Store,Oracle]}DEBUG: Providers Listed By Protocol: {imaps=javax.mail.Provider[STORE,imaps,com.sun.mail.imap.IMAPSSLStore,Oracle], imap=javax.mail.Provider[STORE,imap,com.sun.mail.imap.IMAPStore,Oracle], smtps=javax.mail.Provider[TRANSPORT,smtps,com.sun.mail.smtp.SMTPSSLTransport,Oracle], pop3=javax.mail.Provider[STORE,pop3,com.sun.mail.pop3.POP3Store,Oracle], pop3s=javax.mail.Provider[STORE,pop3s,com.sun.mail.pop3.POP3SSLStore,Oracle], smtp=javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Oracle]}DEBUG: successfully loaded resource: /META-INF/javamail.default.address.mapDEBUG: getProvider() returning javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Oracle]DEBUG SMTP: useEhlo true, useAuth trueDEBUG SMTP: useEhlo true, useAuth trueDEBUG SMTP: trying to connect to host "smtp.gmail.com", port 465, isSSL true220 smtp.gmail.com ESMTP b14sm15106866pfc.76 - gsmtpDEBUG SMTP: connected to host "smtp.gmail.com", port: 465EHLO localhost.localdomain250-smtp.gmail.com at your service250-SIZE 35882577250-8BITMIME250-AUTH LOGIN PLAIN XOAUTH2 PLAIN-CLIENTTOKEN OAUTHBEARER XOAUTH250-ENHANCEDSTATUSCODES250-PIPELINING250-CHUNKING250 SMTPUTF8DEBUG SMTP: Found extension "SIZE", arg "35882577"DEBUG SMTP: Found extension "8BITMIME", arg ""DEBUG SMTP: Found extension "AUTH", arg "LOGIN PLAIN XOAUTH2 PLAIN-CLIENTTOKEN OAUTHBEARER XOAUTH"DEBUG SMTP: Found extension "ENHANCEDSTATUSCODES", arg ""DEBUG SMTP: Found extension "PIPELINING", arg ""DEBUG SMTP: Found extension "CHUNKING", arg ""DEBUG SMTP: Found extension "SMTPUTF8", arg ""DEBUG SMTP: Attempt to authenticate using mechanisms: LOGIN PLAIN DIGEST-MD5 NTLM DEBUG SMTP: AUTH LOGIN command trace suppressedDEBUG SMTP: AUTH LOGIN failedjavax.mail.AuthenticationFailedException: 534-5.7.14 <https://accounts.google.com/signin/continue?sarp=1&scc=1&plt=AKgnsbvN534-5.7.14 -Ydbfzz5_p8nkoM2DkcL3JE5zXXPMGYitc88ssddwt_We6yYvnEq3SNDNu2bluXiiJ7P6L534-5.7.14 hQMPHIvOpQ7DW8lnRUdv7FRrS_ZSP8HoQH1DNcNYMYhMkptySQeGO7UiZMR3tkRJzuPYnK534-5.7.14 TRorlUpJQ-atwOtgez10BgedOHo4sYQkV6rLVNu7HG23YpUpJJLvhjw55q3phkBp0qcjja534-5.7.14 2FsZf5BNQMRCBBlJOjyCqJAIJsnyQ> Please log in via your web browser and534-5.7.14 then try again.534-5.7.14  Learn more at534 5.7.14  https://support.google.com/mail/answer/78754 b14sm15106866pfc.76 - gsmtpat com.sun.mail.smtp.SMTPTransport$Authenticator.authenticate(SMTPTransport.java:826)        at com.sun.mail.smtp.SMTPTransport.authenticate(SMTPTransport.java:761)        at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:685)        at javax.mail.Service.connect(Service.java:317)        at javax.mail.Service.connect(Service.java:176)        at javax.mail.Service.connect(Service.java:125)        at javax.mail.Transport.send0(Transport.java:194)        at javax.mail.Transport.send(Transport.java:124)        at com.ecnu.mail.JavaMailDemo.gmailSender(JavaMailDemo.java:60)        at com.ecnu.mail.JavaMailDemo.main(JavaMailDemo.java:24)

通过查看gmail邮箱帮助：https://support.google.com/accounts/answer/6010255?authuser=1，需要开启“允许不够安全的应用”

开启后，可以通过gmail邮箱发送邮件到qq邮箱。

下面代码里分别测试了从gmai邮箱和qq邮箱发送邮件。但是通过qq邮箱发送邮件，需要使用qq邮箱的授权码，而gmail要开启“允许不够安全的应用”：

代码l如下：

package com.ecnu.mail;import java.security.GeneralSecurityException;import java.security.Security;import java.util.Date;import java.util.Properties;import javax.mail.Authenticator;import javax.mail.Message;import javax.mail.Message.RecipientType;import javax.mail.MessagingException;import javax.mail.PasswordAuthentication;import javax.mail.Session;import javax.mail.Transport;import javax.mail.internet.AddressException;import javax.mail.internet.InternetAddress;import javax.mail.internet.MimeMessage;import com.sun.mail.util.MailSSLSocketFactory;public class JavaMailDemo {public static void main(String[] args) {// qqSender();gmailSender();}//gmail邮箱SSL方式private static void gmailssl(Properties props) {final String SSL_FACTORY = "javax.net.ssl.SSLSocketFactory";props.put("mail.debug", "true");props.put("mail.smtp.host", "smtp.gmail.com");props.put("mail.smtp.ssl.enable", "true");props.put("mail.smtp.socketFactory.class", SSL_FACTORY);props.put("mail.smtp.port", "465");props.put("mail.smtp.socketFactory.port", "465");// props.put("mail.smtp.socketFactory.fallback", "false");props.put("mail.smtp.auth", "true");}//gmail邮箱的TLS方式private static void gmailtls(Properties props) {props.put("mail.smtp.auth", "true");    props.put("mail.smtp.starttls.enable", "true");    props.put("mail.smtp.host", "smtp.gmail.com");    props.put("mail.smtp.port", "587");}/** 通过gmail邮箱发送邮件*/public static void gmailSender() {// Get a Properties objectProperties props = new Properties();//选择ssl方式gmailssl(props);final String username = "[e-mail]";final String password = "password";Session session = Session.getDefaultInstance(props,new Authenticator() {protected PasswordAuthentication getPasswordAuthentication() {return new PasswordAuthentication(username, password);}});// -- Create a new message --Message msg = new MimeMessage(session);// -- Set the FROM and TO fields --try {msg.setFrom(new InternetAddress(username));msg.setRecipients(Message.RecipientType.TO,InternetAddress.parse("[e-mail]"));msg.setSubject("Hello");msg.setText("How are you");msg.setSentDate(new Date());Transport.send(msg);} catch (AddressException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (MessagingException e) {// TODO Auto-generated catch blocke.printStackTrace();}System.out.println("Message sent.");}/** 通过qq邮箱发送邮件,qq邮箱需要在设置里开启POP3/SMTP的授权，通过用户名+授权码方式才能发邮件*/public static void qqSender() {MailSSLSocketFactory msf = null;try {msf = new MailSSLSocketFactory();msf.setTrustAllHosts(true);} catch (GeneralSecurityException e1) {// TODO Auto-generated catch blocke1.printStackTrace();}Properties props = new Properties();// 开启调试props.setProperty("mail.debug", "true");// 是否需要验证props.setProperty("mail.smtp.auth", "true");// 发送邮件服务器props.setProperty("mail.smtp.host", "smtp.qq.com");// 发送邮件协议名称props.setProperty("mail.transport.protocol", "smtp");props.put("mail.smtp.ssl.enable", "true");props.put("mail.smtp.ssl.socketFactory", msf);// 使用匿名内部类，用邮箱进行验证Session session = Session.getInstance(props, new Authenticator() {@Overrideprotected PasswordAuthentication getPasswordAuthentication() {// 通过用户名和密码进行验证return new PasswordAuthentication("[e-mail]","qq邮箱生成的授权码authcode");}});Message message = new MimeMessage(session);try {// 设置邮件发送方message.setFrom(new InternetAddress("[e-mail]"));// 设置邮件标题message.setSubject("测试");// 设置邮件内容message.setContent("测试", "text/html;charset=utf-8");// 设置邮件接收方message.addRecipient(RecipientType.TO, new InternetAddress("[e-mail]"));// 发送邮件Transport.send(message);} catch (AddressException e) {e.printStackTrace();} catch (MessagingException e) {e.printStackTrace();}}}