JavaMail发送邮件

网上有许多关于发送邮件的文章,但是也有许多文章没有提到身份验证,完整的发送邮件的代码如下:
import java.util.*;

import javax.mail.*;
import javax.mail.internet.*;

public class mail {
	public static void main(String[] args) {
		String[] recipients = { "*****@163.com",
								"*****@qq.com",
								"******@163.com",
								"******@servyou.com.cn"};
		String subject = "邮件群发";
		String m_body = "<html><body>测试群发,请点击<a href='http://www.baidu.com/'>百度</a></body></html>"; 
		sendMail(subject,m_body,recipients);
	}

	public static void sendMail(String subject,String m_body,String[] recipients) {
		String host = "smtp.163.com";
		String port = "25";
		String username = "*****@163.com";
		String password = "*****";
		String to = "*****@gmail.com";
		try {
			// 创建一个属性对象
			Properties props = System.getProperties(); // 创建系统属性对象
			props.setProperty("mail.transport.protocol", "smtp"); // 设置使用smtp协议
			props.setProperty("mail.smtp.host", host); // 设置SMTP服务器地址
			props.setProperty("mail.smtp.port", port); // 设置SMTP端口号
			props.setProperty("mail.smtp.auth", "true"); // SMTP服务用户认证
			props.put("mail.smtp.starttls.enable","true");
			// 创建一个过程对象
			PopupAuthenticator authenticator = new PopupAuthenticator();
			authenticator.performCheck(username, password);
			javax.mail.Session sess = javax.mail.Session.getDefaultInstance(
					props, authenticator);
			MimeMessage msg = new MimeMessage(sess); // 创建邮件对象
			msg.setSubject(subject); // 设置邮件主题
			msg.setSentDate(new Date()); // 设置发信日期
			msg.setFrom(new InternetAddress(username)); // 设置发信人
			// 设置主收件人
			msg.setRecipient(Message.RecipientType.TO, new InternetAddress(to));
			// 设置暗抄送人
			InternetAddress[] BCCAddress = new InternetAddress[recipients.length];
			for (int i = 0; i < recipients.length; i++) {
				System.out.println(recipients[i]);
				BCCAddress[i] = new InternetAddress(recipients[i]);
			}
			 msg.addRecipients(Message.RecipientType.BCC,BCCAddress);
			
			MimeMultipart content = new MimeMultipart(); // 创建邮件体对象
			// if(content==null) return false;
			MimeBodyPart part = new MimeBodyPart(); // 创建文本部分对象
			String type = "text/html;charset=UTF-8"; // 文本类型默认为text/plain
			part.setHeader("Content-Type", type);
			part.setText(m_body);
			content.addBodyPart(part);
			msg.setContent(content); // 添加文本至邮件中
			msg.saveChanges(); // 保存修改
			Transport trans = sess.getTransport(); // 创建发送对象
			
			trans.send(msg); // 发送
//			trans.connect(host, 25, username, password);
//			trans.sendMessage(msg, BCCAddress);
			trans.close();
		} catch (Exception ex) {
			ex.printStackTrace();
		}
	}
}
class PopupAuthenticator extends Authenticator{
    String    username=null;
    String    password=null;

    public PopupAuthenticator(){}

    public PasswordAuthentication performCheck(String user,String pass){
           username = user;
           password = pass;
           return getPasswordAuthentication();
    }

    protected PasswordAuthentication getPasswordAuthentication() {
           return new PasswordAuthentication(username, password); 
    } 
}



上面的代码中包含了两种身份验证方式,一种是用了PopupAuthenticator类的验证,
			PopupAuthenticator authenticator = new PopupAuthenticator();
			authenticator.performCheck(username, password);
			javax.mail.Session sess = javax.mail.Session.getDefaultInstance(
					props, authenticator);



另一种是
			javax.mail.Session sess = javax.mail.Session.getDefaultInstance(
					props, null);

			trans.connect(host, 25, username, password);
			trans.sendMessage(msg, BCCAddress);



这个邮件发送程序有不足之处就是发送邮件时,部分邮箱收不到邮件,可能与邮件的规范有关系,在设置邮件标题的时候要注意,不要乱写

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