POP3_使用SSL链接邮箱并获取邮件

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    }