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. [代码]GmailFetch.java 跳至 [1] [2] [全屏预览]
01 package lius.javamail.ssl;
02
03 import java.io.UnsupportedEncodingException;
04 import java.security.*;
05 import java.util.Properties;
06 import javax.mail.*;
07 import javax.mail.internet.InternetAddress;
08 import javax.mail.internet.MimeUtility;
09
10 /**
11 * 用于收取Gmail邮件
12 * @author Winter Lau
13 */
14 public class GmailFetch {
15
16 public static void main(String argv[]) throws Exception {
17
18 Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());
19 final String SSL_FACTORY = "javax.net.ssl.SSLSocketFactory";
20
21 // Get a Properties object
22 Properties props = System.getProperties();
23 props.setProperty("mail.pop3.socketFactory.class", SSL_FACTORY);
24 props.setProperty("mail.pop3.socketFactory.fallback", "false");
25 props.setProperty("mail.pop3.port", "995");
26 props.setProperty("mail.pop3.socketFactory.port", "995");
27
28 //以下步骤跟一般的JavaMail操作相同
29 Session session = Session.getDefaultInstance(props,null);
30
31 //请将红色部分对应替换成你的邮箱帐号和密码
32 URLName urln = new URLName("pop3","pop.gmail.com",995,null,
33 "[邮箱帐号]", "[邮箱密码]");
34 Store store = session.getStore(urln);
35 Folder inbox = null;
36 try {
37 store.connect();
38 inbox = store.getFolder("INBOX");
39 inbox.open(Folder.READ_ONLY);
40 FetchProfile profile = new FetchProfile();
41 profile.add(FetchProfile.Item.ENVELOPE);
42 Message[] messages = inbox.getMessages();
43 inbox.fetch(messages, profile);
44 System.out.println("收件箱的邮件数：" + messages.length);
45 for (int i = 0; i < messages.length; i++) {
46 //邮件发送者
47 String from = decodeText(messages[i].getFrom()[0].toString());
48 InternetAddress ia = new InternetAddress(from);
49 System.out.println("FROM:" + ia.getPersonal()+'('+ia.getAddress()+')');
50 //邮件标题
51 System.out.println("TITLE:" + messages[i].getSubject());
52 //邮件大小
53 System.out.println("SIZE:" + messages[i].getSize());
54 //邮件发送时间
55 System.out.println("DATE:" + messages[i].getSentDate());
56 }
57 } finally {
58 try {
59 inbox.close(false);
60 } catch (Exception e) {}
61 try {
62 store.close();
63 } catch (Exception e) {}
64 }
65 }
66
67 protected static String decodeText(String text)
68 throws UnsupportedEncodingException {
69 if (text == null)
70 return null;
71 if (text.startsWith("=?GB") || text.startsWith("=?gb"))
72 text = MimeUtility.decodeText(text);
73 else
74 text = new String(text.getBytes("ISO8859_1"));
75 return text;
76 }
77
78 }
2. [代码]GmailSender.java
01 package lius.javamail.ssl;
02
03 import java.security.Security;
04 import java.util.Date;
05 import java.util.Properties;
06
07 import javax.mail.Authenticator;
08 import javax.mail.Message;
09 import javax.mail.MessagingException;
10 import javax.mail.PasswordAuthentication;
11 import javax.mail.Session;
12 import javax.mail.Transport;
13 import javax.mail.internet.AddressException;
14 import javax.mail.internet.InternetAddress;
15 import javax.mail.internet.MimeMessage;
16
17 /**
18 * 使用Gmail发送邮件
19 * @author Winter Lau
20 */
21 public class GmailSender {
22
23 public static void main(String[] args) throws AddressException, MessagingException {
24 Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());
25 final String SSL_FACTORY = "javax.net.ssl.SSLSocketFactory";
26 // Get a Properties object
27 Properties props = System.getProperties();
28 props.setProperty("mail.smtp.host", "smtp.gmail.com");
29 props.setProperty("mail.smtp.socketFactory.class", SSL_FACTORY);
30 props.setProperty("mail.smtp.socketFactory.fallback", "false");
31 props.setProperty("mail.smtp.port", "465");
32 props.setProperty("mail.smtp.socketFactory.port", "465");
33 props.put("mail.smtp.auth", "true");
34 final String username = "[邮箱帐号]";
35 final String password = "[邮箱密码]";
36 Session session = Session.getDefaultInstance(props, new Authenticator(){
37 protected PasswordAuthentication getPasswordAuthentication() {
38 return new PasswordAuthentication(username, password);
39 }});
40
41 // -- Create a new message --
42 Message msg = new MimeMessage(session);
43
44 // -- Set the FROM and TO fields --
45 msg.setFrom(new InternetAddress(username + "@mo168.com"));
46 msg.setRecipients(Message.RecipientType.TO,
47 InternetAddress.parse("[收件人地址]",false));
48 msg.setSubject("Hello");
49 msg.setText("How are you");
50 msg.setSentDate(new Date());
51 Transport.send(msg);
52
53 System.out.println("Message sent.");
54 }
55 }
