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
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();
其他回答
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();
一个简单的方法是为POP3访问配置/启用gmail帐户。这将允许您通过gmail服务器通过普通SMTP发送邮件。
然后通过smtp.gmail.com发送(端口587)
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();
}
}
}
Other people have good answers above, but I wanted to add a note on my experience here. I've found that when using Gmail as an outbound SMTP server for my webapp, Gmail only lets me send ~10 or so messages before responding with an anti-spam response that I have to manually step through to re-enable SMTP access. The emails I was sending were not spam, but were website "welcome" emails when users registered with my system. So, YMMV, and I wouldn't rely on Gmail for a production webapp. If you're sending email on a user's behalf, like an installed desktop app (where the user enters their own Gmail credentials), you may be okay.
此外，如果你使用Spring，这里有一个使用Gmail进行出站SMTP的工作配置:
<bean id="mailSender" class="org.springframework.mail.javamail.JavaMailSenderImpl">
<property name="defaultEncoding" value="UTF-8"/>
<property name="host" value="smtp.gmail.com"/>
<property name="port" value="465"/>
<property name="username" value="${mail.username}"/>
<property name="password" value="${mail.password}"/>
<property name="javaMailProperties">
<value>
mail.debug=true
mail.smtp.auth=true
mail.smtp.socketFactory.class=java.net.SocketFactory
mail.smtp.socketFactory.fallback=false
</value>
</property>
</bean>
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
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