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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 lius.javamail.ssl;
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);
//请将红色部分对应替换成你的邮箱帐号和密码
URLName urln = new URLName("pop3","pop.gmail.com",995,null,
"[邮箱帐号]", "[邮箱密码]");
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()+')');
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