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
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
其他回答
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。
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();
}
}
}
这是一个使用Gmail发送电子邮件的简单类。您需要将JavaMail库添加到构建路径中，或者直接使用Maven。
import java.util.Properties;
import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.FileDataSource;
import javax.mail.BodyPart;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
public class GmailSender
{
private static String protocol = "smtp";
private String username;
private String password;
private Session session;
private Message message;
private Multipart multipart;
public GmailSender()
{
this.multipart = new MimeMultipart();
}
public void setSender(String username, String password)
{
this.username = username;
this.password = password;
this.session = getSession();
this.message = new MimeMessage(session);
}
public void addRecipient(String recipient) throws AddressException, MessagingException
{
message.addRecipient(Message.RecipientType.TO, new InternetAddress(recipient));
}
public void setSubject(String subject) throws MessagingException
{
message.setSubject(subject);
}
public void setBody(String body) throws MessagingException
{
BodyPart messageBodyPart = new MimeBodyPart();
messageBodyPart.setText(body);
multipart.addBodyPart(messageBodyPart);
message.setContent(multipart);
}
public void send() throws MessagingException
{
Transport transport = session.getTransport(protocol);
transport.connect(username, password);
transport.sendMessage(message, message.getAllRecipients());
transport.close();
}
public void addAttachment(String filePath) throws MessagingException
{
BodyPart messageBodyPart = getFileBodyPart(filePath);
multipart.addBodyPart(messageBodyPart);
message.setContent(multipart);
}
private BodyPart getFileBodyPart(String filePath) throws MessagingException
{
BodyPart messageBodyPart = new MimeBodyPart();
DataSource dataSource = new FileDataSource(filePath);
messageBodyPart.setDataHandler(new DataHandler(dataSource));
messageBodyPart.setFileName(filePath);
return messageBodyPart;
}
private Session getSession()
{
Properties properties = getMailServerProperties();
Session session = Session.getDefaultInstance(properties);
return session;
}
private Properties getMailServerProperties()
{
Properties properties = System.getProperties();
properties.put("mail.smtp.starttls.enable", "true");
properties.put("mail.smtp.host", protocol + ".gmail.com");
properties.put("mail.smtp.user", username);
properties.put("mail.smtp.password", password);
properties.put("mail.smtp.port", "587");
properties.put("mail.smtp.auth", "true");
return properties;
}
}
使用示例:
GmailSender sender = new GmailSender();
sender.setSender("myEmailNameWithout@gmail.com", "mypassword");
sender.addRecipient("recipient@somehost.com");
sender.setSubject("The subject");
sender.setBody("The body");
sender.addAttachment("TestFile.txt");
sender.send();
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
这就是我所做的，当我想发送带有附件的电子邮件时，工作正常。：）
public class NewClass {
public static void main(String[] args) {
try {
Properties props = System.getProperties();
props.put("mail.smtp.starttls.enable", "true");
props.put("mail.smtp.host", "smtp.gmail.com");
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.port", "465"); // smtp port
Authenticator auth = new Authenticator() {
@Override
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication("username-gmail", "password-gmail");
}
};
Session session = Session.getDefaultInstance(props, auth);
MimeMessage msg = new MimeMessage(session);
msg.setFrom(new InternetAddress("username-gmail@gmail.com"));
msg.setSubject("Try attachment gmail");
msg.setRecipient(RecipientType.TO, new InternetAddress("username-gmail@gmail.com"));
//add atleast simple body
MimeBodyPart body = new MimeBodyPart();
body.setText("Try attachment");
//do attachment
MimeBodyPart attachMent = new MimeBodyPart();
FileDataSource dataSource = new FileDataSource(new File("file-sent.txt"));
attachMent.setDataHandler(new DataHandler(dataSource));
attachMent.setFileName("file-sent.txt");
attachMent.setDisposition(MimeBodyPart.ATTACHMENT);
Multipart multipart = new MimeMultipart();
multipart.addBodyPart(body);
multipart.addBodyPart(attachMent);
msg.setContent(multipart);
Transport.send(msg);
} catch (AddressException ex) {
Logger.getLogger(NewClass.class.getName()).log(Level.SEVERE, null, ex);
} catch (MessagingException ex) {
Logger.getLogger(NewClass.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
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