进行JavaMail 收发邮件,必须导入2个Jar包 Mail.Jar Activation.Jar

//利用JavaMail收/发Gmail邮件(SSL)

//Gmail目前已经启用了POP3和SMTP服务

//与其他邮箱不同的是Gmail提供的POP3和SMTP是使用安全套接字层SSL的，因此常规的JavaMail程序是无法收发邮件的，

//下面是使用JavaMail如何收取Gmail邮件以及发送邮件的代码：

//1. 邮件收取

package zjk.javamail;

import java.io.UnsupportedEncodingException;

import java.security.*;

import java.util.Properties;

import javax.mail.*;

import javax.mail.internet.InternetAddress;

import javax.mail.internet.MimeUtility;

/**

* 用于收取Gmail邮件

*

* @author Winter Lau

*/

public class GmailFetch {

public static void main(String argv[]) throws Exception {

Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());

final String SSL_FACTORY = "javax.net.ssl.SSLSocketFactory";

// Get a Properties object

Properties props = System.getProperties();

props.setProperty("mail.pop3.socketFactory.class", SSL_FACTORY);

props.setProperty("mail.pop3.socketFactory.fallback", "false");

props.setProperty("mail.pop3.port", "995");

props.setProperty("mail.pop3.socketFactory.port", "995");

// 以下步骤跟一般的JavaMail操作相同

Session session = Session.getDefaultInstance(props, null);

// 请填写你的邮箱帐号和密码

URLName urln = new URLName("pop3", "pop.gmail.com", 995, null,

"【你的邮箱账号，如：zhangjiankun880@gmail.com】", "【你的密码】");

Store store = session.getStore(urln);

Folder inbox = null;

try {

store.connect();

inbox = store.getFolder("INBOX");

inbox.open(Folder.READ_ONLY);

FetchProfile profile = new FetchProfile();

profile.add(FetchProfile.Item.ENVELOPE);

Message[] messages = inbox.getMessages();

inbox.fetch(messages, profile);

System.out.println("收件箱的邮件数：" + messages.length);

for (int i = 0; i < messages.length; i++) {

// 邮件发送者

String from = decodeText(messages[i].getFrom()[0].toString());

InternetAddress ia = new InternetAddress(from);

System.out.println("FROM:" + ia.getPersonal() + '('

+ ia.getAddress() + ')');

// 邮件标题

System.out.println("TITLE:" + messages[i].getSubject());

// 邮件大小

System.out.println("SIZE:" + messages[i].getSize());

// 邮件发送时间

System.out.println("DATE:" + messages[i].getSentDate());

}

} finally {

try {

inbox.close(false);

} catch (Exception e) {

}

try {

store.close();

} catch (Exception e) {

}

}

}

protected static String decodeText(String text)

throws UnsupportedEncodingException {

if (text == null)

return null;

if (text.startsWith("=?GB") || text.startsWith("=?gb"))

text = MimeUtility.decodeText(text);

else

text = new String(text.getBytes("ISO8859_1"));

return text;

}

}

//2. 发送邮件

package zjk.javamail;

import java.security.Security;

import java.util.Date;

import java.util.Properties;

import javax.mail.Authenticator;

import javax.mail.Message;

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;

/**

* 使用Gmail发送邮件

*

* @author Winter Lau

*/

public class GmailSender {

public static void main(String[] args) throws AddressException,

MessagingException {

Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());

final String SSL_FACTORY = "javax.net.ssl.SSLSocketFactory";

// Get a Properties object

Properties props = System.getProperties();

props.setProperty("mail.smtp.host", "smtp.gmail.com");

props.setProperty("mail.smtp.socketFactory.class", SSL_FACTORY);

props.setProperty("mail.smtp.socketFactory.fallback", "false");

props.setProperty("mail.smtp.port", "465");

props.setProperty("mail.smtp.socketFactory.port", "465");

props.put("mail.smtp.auth", "true");

final String username = "【你的邮箱账号，如：zhangjiankun880@gmail.com】";

final String password = "【你的密码】";

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 --

msg.setFrom(new InternetAddress(username));

msg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(

"【收件人的账号】", false));

msg.setSubject("Hello");

msg.setText("How are you");

msg.setSentDate(new Date());

Transport.send(msg);

System.out.println("Message sent.");

}

}