是否可以从我的Java应用程序使用GMail帐户发送电子邮件?我已经用Java应用程序配置了我的公司邮件服务器来发送电子邮件，但当我分发应用程序时，这并不会削减它。使用Hotmail, Yahoo或GMail的任何答案都是可以接受的。
当前回答
增值:
主题、消息和显示名称中的编码缺陷 现代Java邮件库版本只需要一个神奇的属性 建议Session.getInstance()优于Session.getDefaultInstance() 附件 谷歌关闭不太安全的应用程序后仍然有效:在您的组织中启用2因素身份验证->打开2FA ->生成应用程序密码。
import java.io.File;
import java.nio.charset.StandardCharsets;
import java.util.Properties;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.activation.DataHandler;
import javax.mail.Message;
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;
import javax.mail.util.ByteArrayDataSource;
public class Gmailer {
private static final Logger LOGGER = Logger.getLogger(Gmailer.class.getName());
public static void main(String[] args) {
send();
}
public static void send() {
Transport transport = null;
try {
String accountEmail = "account@source.com";
String accountAppPassword = "";
String displayName = "Display-Name 東";
String replyTo = "reply-to@source.com";
String to = "to@target.com";
String cc = "cc@target.com";
String bcc = "bcc@target.com";
String subject = "Subject 東";
String message = "<span style='color: red;'>東</span>";
String type = "html"; // or "plain"
String mimeTypeWithEncoding = "text/" + type + "; charset=" + StandardCharsets.UTF_8.name();
File attachmentFile = new File("Attachment.pdf");
// https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types/Common_types
String attachmentMimeType = "application/pdf";
byte[] bytes = ...; // read file to byte array
Properties properties = System.getProperties();
properties.put("mail.debug", "true");
// i found that this is the only property necessary for a modern java mail version
properties.put("mail.smtp.starttls.enable", "true");
// https://javaee.github.io/javamail/FAQ#getdefaultinstance
Session session = Session.getInstance(properties);
MimeMessage mimeMessage = new MimeMessage(session);
// probably best to use the account email address, to avoid landing in spam or blacklists
// not even sure if the server would accept a differing from address
InternetAddress from = new InternetAddress(accountEmail);
from.setPersonal(displayName, StandardCharsets.UTF_8.name());
mimeMessage.setFrom(from);
mimeMessage.setReplyTo(InternetAddress.parse(replyTo));
mimeMessage.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to));
mimeMessage.setRecipients(Message.RecipientType.CC, InternetAddress.parse(cc));
mimeMessage.setRecipients(Message.RecipientType.BCC, InternetAddress.parse(bcc));
mimeMessage.setSubject(subject, StandardCharsets.UTF_8.name());
MimeMultipart multipart = new MimeMultipart();
MimeBodyPart messagePart = new MimeBodyPart();
messagePart.setContent(mimeMessage, mimeTypeWithEncoding);
multipart.addBodyPart(messagePart);
MimeBodyPart attachmentPart = new MimeBodyPart();
attachmentPart.setDataHandler(new DataHandler(new ByteArrayDataSource(bytes, attachmentMimeType)));
attachmentPart.setFileName(attachmentFile.getName());
multipart.addBodyPart(attachmentPart);
mimeMessage.setContent(multipart);
transport = session.getTransport();
transport.connect("smtp.gmail.com", 587, accountEmail, accountAppPassword);
transport.sendMessage(mimeMessage, mimeMessage.getAllRecipients());
}
catch(Exception e) {
// I prefer to bubble up exceptions, so the caller has the info that someting went wrong, and gets a chance to handle it.
// I also prefer not to force the exception in the signature.
throw e instanceof RuntimeException ? (RuntimeException) e : new RuntimeException(e);
}
finally {
if(transport != null) {
try {
transport.close();
}
catch(Exception e) {
LOGGER.log(Level.WARNING, "failed to close java mail transport: " + e);
}
}
}
}
}
其他回答
增值:
主题、消息和显示名称中的编码缺陷 现代Java邮件库版本只需要一个神奇的属性 建议Session.getInstance()优于Session.getDefaultInstance() 附件 谷歌关闭不太安全的应用程序后仍然有效:在您的组织中启用2因素身份验证->打开2FA ->生成应用程序密码。
import java.io.File;
import java.nio.charset.StandardCharsets;
import java.util.Properties;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.activation.DataHandler;
import javax.mail.Message;
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;
import javax.mail.util.ByteArrayDataSource;
public class Gmailer {
private static final Logger LOGGER = Logger.getLogger(Gmailer.class.getName());
public static void main(String[] args) {
send();
}
public static void send() {
Transport transport = null;
try {
String accountEmail = "account@source.com";
String accountAppPassword = "";
String displayName = "Display-Name 東";
String replyTo = "reply-to@source.com";
String to = "to@target.com";
String cc = "cc@target.com";
String bcc = "bcc@target.com";
String subject = "Subject 東";
String message = "<span style='color: red;'>東</span>";
String type = "html"; // or "plain"
String mimeTypeWithEncoding = "text/" + type + "; charset=" + StandardCharsets.UTF_8.name();
File attachmentFile = new File("Attachment.pdf");
// https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types/Common_types
String attachmentMimeType = "application/pdf";
byte[] bytes = ...; // read file to byte array
Properties properties = System.getProperties();
properties.put("mail.debug", "true");
// i found that this is the only property necessary for a modern java mail version
properties.put("mail.smtp.starttls.enable", "true");
// https://javaee.github.io/javamail/FAQ#getdefaultinstance
Session session = Session.getInstance(properties);
MimeMessage mimeMessage = new MimeMessage(session);
// probably best to use the account email address, to avoid landing in spam or blacklists
// not even sure if the server would accept a differing from address
InternetAddress from = new InternetAddress(accountEmail);
from.setPersonal(displayName, StandardCharsets.UTF_8.name());
mimeMessage.setFrom(from);
mimeMessage.setReplyTo(InternetAddress.parse(replyTo));
mimeMessage.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to));
mimeMessage.setRecipients(Message.RecipientType.CC, InternetAddress.parse(cc));
mimeMessage.setRecipients(Message.RecipientType.BCC, InternetAddress.parse(bcc));
mimeMessage.setSubject(subject, StandardCharsets.UTF_8.name());
MimeMultipart multipart = new MimeMultipart();
MimeBodyPart messagePart = new MimeBodyPart();
messagePart.setContent(mimeMessage, mimeTypeWithEncoding);
multipart.addBodyPart(messagePart);
MimeBodyPart attachmentPart = new MimeBodyPart();
attachmentPart.setDataHandler(new DataHandler(new ByteArrayDataSource(bytes, attachmentMimeType)));
attachmentPart.setFileName(attachmentFile.getName());
multipart.addBodyPart(attachmentPart);
mimeMessage.setContent(multipart);
transport = session.getTransport();
transport.connect("smtp.gmail.com", 587, accountEmail, accountAppPassword);
transport.sendMessage(mimeMessage, mimeMessage.getAllRecipients());
}
catch(Exception e) {
// I prefer to bubble up exceptions, so the caller has the info that someting went wrong, and gets a chance to handle it.
// I also prefer not to force the exception in the signature.
throw e instanceof RuntimeException ? (RuntimeException) e : new RuntimeException(e);
}
finally {
if(transport != null) {
try {
transport.close();
}
catch(Exception e) {
LOGGER.log(Level.WARNING, "failed to close java mail transport: " + e);
}
}
}
}
}
//set CLASSPATH=%CLASSPATH%;activation.jar;mail.jar
import javax.mail.*;
import javax.mail.internet.*;
import java.util.*;
public class Mail
{
String d_email = "iamdvr@gmail.com",
d_password = "****",
d_host = "smtp.gmail.com",
d_port = "465",
m_to = "iamdvr@yahoo.com",
m_subject = "Testing",
m_text = "Hey, this is the testing email using smtp.gmail.com.";
public static void main(String[] args)
{
String[] to={"XXX@yahoo.com"};
String[] cc={"XXX@yahoo.com"};
String[] bcc={"XXX@yahoo.com"};
//This is for google
Mail.sendMail("venkatesh@dfdf.com", "password", "smtp.gmail.com",
"465", "true", "true",
true, "javax.net.ssl.SSLSocketFactory", "false",
to, cc, bcc,
"hi baba don't send virus mails..",
"This is my style...of reply..If u send virus mails..");
}
public synchronized static boolean sendMail(
String userName, String passWord, String host,
String port, String starttls, String auth,
boolean debug, String socketFactoryClass, String fallback,
String[] to, String[] cc, String[] bcc,
String subject, String text)
{
Properties props = new Properties();
//Properties props=System.getProperties();
props.put("mail.smtp.user", userName);
props.put("mail.smtp.host", host);
if(!"".equals(port))
props.put("mail.smtp.port", port);
if(!"".equals(starttls))
props.put("mail.smtp.starttls.enable",starttls);
props.put("mail.smtp.auth", auth);
if(debug) {
props.put("mail.smtp.debug", "true");
} else {
props.put("mail.smtp.debug", "false");
}
if(!"".equals(port))
props.put("mail.smtp.socketFactory.port", port);
if(!"".equals(socketFactoryClass))
props.put("mail.smtp.socketFactory.class",socketFactoryClass);
if(!"".equals(fallback))
props.put("mail.smtp.socketFactory.fallback", fallback);
try
{
Session session = Session.getDefaultInstance(props, null);
session.setDebug(debug);
MimeMessage msg = new MimeMessage(session);
msg.setText(text);
msg.setSubject(subject);
msg.setFrom(new InternetAddress("p_sambasivarao@sutyam.com"));
for(int i=0;i<to.length;i++) {
msg.addRecipient(Message.RecipientType.TO,
new InternetAddress(to[i]));
}
for(int i=0;i<cc.length;i++) {
msg.addRecipient(Message.RecipientType.CC,
new InternetAddress(cc[i]));
}
for(int i=0;i<bcc.length;i++) {
msg.addRecipient(Message.RecipientType.BCC,
new InternetAddress(bcc[i]));
}
msg.saveChanges();
Transport transport = session.getTransport("smtp");
transport.connect(host, userName, passWord);
transport.sendMessage(msg, msg.getAllRecipients());
transport.close();
return true;
}
catch (Exception mex)
{
mex.printStackTrace();
return false;
}
}
}
就像这样(听起来你只需要改变你的SMTP服务器):
String host = "smtp.gmail.com";
String from = "user name";
Properties props = System.getProperties();
props.put("mail.smtp.host", host);
props.put("mail.smtp.user", from);
props.put("mail.smtp.password", "asdfgh");
props.put("mail.smtp.port", "587"); // 587 is the port number of yahoo mail
props.put("mail.smtp.auth", "true");
Session session = Session.getDefaultInstance(props, null);
MimeMessage message = new MimeMessage(session);
message.setFrom(new InternetAddress(from));
InternetAddress[] to_address = new InternetAddress[to.length];
int i = 0;
// To get the array of addresses
while (to[i] != null) {
to_address[i] = new InternetAddress(to[i]);
i++;
}
System.out.println(Message.RecipientType.TO);
i = 0;
while (to_address[i] != null) {
message.addRecipient(Message.RecipientType.TO, to_address[i]);
i++;
}
message.setSubject("sending in a group");
message.setText("Welcome to JavaMail");
// alternately, to send HTML mail:
// message.setContent("<p>Welcome to JavaMail</p>", "text/html");
Transport transport = session.getTransport("smtp");
transport.connect("smtp.mail.yahoo.co.in", "user name", "asdfgh");
transport.sendMessage(message, message.getAllRecipients());
transport.close();
尽管这个问题已经结束，我想发布一个计数器解决方案，但现在使用简单Java邮件(开源JavaMail smtp包装器):
final Email email = new Email();
String host = "smtp.gmail.com";
Integer port = 587;
String from = "username";
String pass = "password";
String[] to = {"to@gmail.com"};
email.setFromAddress("", from);
email.setSubject("sending in a group");
for( int i=0; i < to.length; i++ ) {
email.addRecipient("", to[i], RecipientType.TO);
}
email.setText("Welcome to JavaMail");
new Mailer(host, port, from, pass).sendMail(email);
// you could also still use your mail session instead
new Mailer(session).sendMail(email);
我的完整代码如下所示，运行良好:
package ripon.java.mail;
import java.util.*;
import javax.mail.*;
import javax.mail.internet.*;
public class SendEmail
{
public static void main(String [] args)
{
// Sender's email ID needs to be mentioned
String from = "test@gmail.com";
String pass ="test123";
// Recipient's email ID needs to be mentioned.
String to = "ripon420@yahoo.com";
String host = "smtp.gmail.com";
// Get system properties
Properties properties = System.getProperties();
// Setup mail server
properties.put("mail.smtp.starttls.enable", "true");
properties.put("mail.smtp.host", host);
properties.put("mail.smtp.user", from);
properties.put("mail.smtp.password", pass);
properties.put("mail.smtp.port", "587");
properties.put("mail.smtp.auth", "true");
// Get the default Session object.
Session session = Session.getDefaultInstance(properties);
try{
// Create a default MimeMessage object.
MimeMessage message = new MimeMessage(session);
// Set From: header field of the header.
message.setFrom(new InternetAddress(from));
// Set To: header field of the header.
message.addRecipient(Message.RecipientType.TO,
new InternetAddress(to));
// Set Subject: header field
message.setSubject("This is the Subject Line!");
// Now set the actual message
message.setText("This is actual message");
// Send message
Transport transport = session.getTransport("smtp");
transport.connect(host, from, pass);
transport.sendMessage(message, message.getAllRecipients());
transport.close();
System.out.println("Sent message successfully....");
}catch (MessagingException mex) {
mex.printStackTrace();
}
}
}
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