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
嗨，试试这个代码....
package my.test.service;
import java.util.Properties;
import javax.mail.Authenticator;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Message;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
public class Sample {
public static void main(String args[]) {
final String SMTP_HOST = "smtp.gmail.com";
final String SMTP_PORT = "587";
final String GMAIL_USERNAME = "xxxxxxxxxx@gmail.com";
final String GMAIL_PASSWORD = "xxxxxxxxxx";
System.out.println("Process Started");
Properties prop = System.getProperties();
prop.setProperty("mail.smtp.starttls.enable", "true");
prop.setProperty("mail.smtp.host", SMTP_HOST);
prop.setProperty("mail.smtp.user", GMAIL_USERNAME);
prop.setProperty("mail.smtp.password", GMAIL_PASSWORD);
prop.setProperty("mail.smtp.port", SMTP_PORT);
prop.setProperty("mail.smtp.auth", "true");
System.out.println("Props : " + prop);
Session session = Session.getInstance(prop, new Authenticator() {
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(GMAIL_USERNAME,
GMAIL_PASSWORD);
}
});
System.out.println("Got Session : " + session);
MimeMessage message = new MimeMessage(session);
try {
System.out.println("before sending");
message.setFrom(new InternetAddress(GMAIL_USERNAME));
message.addRecipients(Message.RecipientType.TO,
InternetAddress.parse(GMAIL_USERNAME));
message.setSubject("My First Email Attempt from Java");
message.setText("Hi, This mail came from Java Application.");
message.setRecipients(Message.RecipientType.TO,
InternetAddress.parse(GMAIL_USERNAME));
Transport transport = session.getTransport("smtp");
System.out.println("Got Transport" + transport);
transport.connect(SMTP_HOST, GMAIL_USERNAME, GMAIL_PASSWORD);
transport.sendMessage(message, message.getAllRecipients());
System.out.println("message Object : " + message);
System.out.println("Email Sent Successfully");
} catch (AddressException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (MessagingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
其他回答
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);
首先下载JavaMail API，并确保相关jar文件在您的类路径中。
下面是使用GMail的完整工作示例。
import java.util.*;
import javax.mail.*;
import javax.mail.internet.*;
public class Main {
private static String USER_NAME = "*****"; // GMail user name (just the part before "@gmail.com")
private static String PASSWORD = "********"; // GMail password
private static String RECIPIENT = "lizard.bill@myschool.edu";
public static void main(String[] args) {
String from = USER_NAME;
String pass = PASSWORD;
String[] to = { RECIPIENT }; // list of recipient email addresses
String subject = "Java send mail example";
String body = "Welcome to JavaMail!";
sendFromGMail(from, pass, to, subject, body);
}
private static void sendFromGMail(String from, String pass, String[] to, String subject, String body) {
Properties props = System.getProperties();
String host = "smtp.gmail.com";
props.put("mail.smtp.starttls.enable", "true");
props.put("mail.smtp.host", host);
props.put("mail.smtp.user", from);
props.put("mail.smtp.password", pass);
props.put("mail.smtp.port", "587");
props.put("mail.smtp.auth", "true");
Session session = Session.getDefaultInstance(props);
MimeMessage message = new MimeMessage(session);
try {
message.setFrom(new InternetAddress(from));
InternetAddress[] toAddress = new InternetAddress[to.length];
// To get the array of addresses
for( int i = 0; i < to.length; i++ ) {
toAddress[i] = new InternetAddress(to[i]);
}
for( int i = 0; i < toAddress.length; i++) {
message.addRecipient(Message.RecipientType.TO, toAddress[i]);
}
message.setSubject(subject);
message.setText(body);
Transport transport = session.getTransport("smtp");
transport.connect(host, from, pass);
transport.sendMessage(message, message.getAllRecipients());
transport.close();
}
catch (AddressException ae) {
ae.printStackTrace();
}
catch (MessagingException me) {
me.printStackTrace();
}
}
}
当然，您希望在catch块中做更多的事情，而不是像我在上面的示例代码中那样打印堆栈跟踪。(删除catch块，查看JavaMail API的哪些方法调用会抛出异常，以便更好地了解如何正确处理它们。)
感谢@jodonnel和所有回复的人。我之所以给他奖金，是因为他的回答让我找到了95%的完整答案。
如果你想使用outlook和Javamail API，那么使用
smtp-mail.outlook.com
更多和完整的工作代码检查这个答案。
当您需要在同一个JVM中任意位置设置多个SMTP会话时，所发布的代码解决方案可能会导致问题。
JavaMail FAQ建议使用
Session.getInstance(properties);
而不是
Session.getDefaultInstance(properties);
因为getDefault只会使用第一次调用时给出的属性。以后对默认实例的所有使用都将忽略属性更改。
见http://www.oracle.com/technetwork/java/faq - 135477. # getdefaultinstance html
嗨，试试这个代码....
package my.test.service;
import java.util.Properties;
import javax.mail.Authenticator;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Message;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
public class Sample {
public static void main(String args[]) {
final String SMTP_HOST = "smtp.gmail.com";
final String SMTP_PORT = "587";
final String GMAIL_USERNAME = "xxxxxxxxxx@gmail.com";
final String GMAIL_PASSWORD = "xxxxxxxxxx";
System.out.println("Process Started");
Properties prop = System.getProperties();
prop.setProperty("mail.smtp.starttls.enable", "true");
prop.setProperty("mail.smtp.host", SMTP_HOST);
prop.setProperty("mail.smtp.user", GMAIL_USERNAME);
prop.setProperty("mail.smtp.password", GMAIL_PASSWORD);
prop.setProperty("mail.smtp.port", SMTP_PORT);
prop.setProperty("mail.smtp.auth", "true");
System.out.println("Props : " + prop);
Session session = Session.getInstance(prop, new Authenticator() {
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(GMAIL_USERNAME,
GMAIL_PASSWORD);
}
});
System.out.println("Got Session : " + session);
MimeMessage message = new MimeMessage(session);
try {
System.out.println("before sending");
message.setFrom(new InternetAddress(GMAIL_USERNAME));
message.addRecipients(Message.RecipientType.TO,
InternetAddress.parse(GMAIL_USERNAME));
message.setSubject("My First Email Attempt from Java");
message.setText("Hi, This mail came from Java Application.");
message.setRecipients(Message.RecipientType.TO,
InternetAddress.parse(GMAIL_USERNAME));
Transport transport = session.getTransport("smtp");
System.out.println("Got Transport" + transport);
transport.connect(SMTP_HOST, GMAIL_USERNAME, GMAIL_PASSWORD);
transport.sendMessage(message, message.getAllRecipients());
System.out.println("message Object : " + message);
System.out.println("Email Sent Successfully");
} catch (AddressException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (MessagingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
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