利用JavaMail发送邮件的一个例子

package nl.waai.mail;


import java.util.Date;
import java.util.Properties;


import javax.mail.Address;
import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
/** *//**
 * 发送普通邮件，接受普通邮件 发送带有附件的邮件，接收带有附件的邮件 发送html形式的邮件，接受html形式的邮件 发送带有图片的邮件等做了一个总结。
 */


public class MailTest {


/**
* @param args
*/
// 邮箱服务器
private String host = "smtp.163.com";
// 这个是你的邮箱用户名
private String username = "***";
// 你的邮箱密码
private String password = "**";


private String mail_head_name = "this is head of this mail";


private String mail_head_value = "this is head of this mail";


private String mail_to = "**@163.com";


private String mail_from = "**@163.com";


private String mail_subject = "this is the subject of this test mail";


private String mail_body = "this is the mail_body of this test mail";


private String personalName = "我的邮件";


/** */
/**
* 此段代码用来发送普通电子邮件
*/
public void send() throws Exception {
try {
Properties props = new Properties(); // 获取系统环境
Authenticator auth = new Email_Autherticator(); // 进行邮件服务器用户认证
props.put("mail.smtp.host", host);
props.put("mail.smtp.auth", "true");
Session session = Session.getDefaultInstance(props, auth);
// 设置session,和邮件服务器进行通讯。
MimeMessage message = new MimeMessage(session);
// message.setContent("foobar, "application/x-foobar"); // 设置邮件格式
message.setSubject(mail_subject); // 设置邮件主题
message.setText(mail_body); // 设置邮件正文
message.setHeader(mail_head_name, mail_head_value); // 设置邮件标题
message.setSentDate(new Date()); // 设置邮件发送日期
Address address = new InternetAddress(mail_from, personalName);
message.setFrom(address); // 设置邮件发送者的地址
Address toAddress = new InternetAddress(mail_to); // 设置邮件接收方的地址
message.addRecipient(Message.RecipientType.TO, toAddress);
Transport.send(message); // 发送邮件
System.out.println("send ok!");
} catch (Exception ex) {
ex.printStackTrace();
throw new Exception(ex.getMessage());
}
}


/** */
/**
* 用来进行服务器对用户的认证
*/
public class Email_Autherticator extends Authenticator {
public Email_Autherticator() {
super();
}


public Email_Autherticator(String user, String pwd) {
super();
username = user;
password = pwd;
}


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


public static void main(String[] args) {
MailTest sendmail = new MailTest();
try {
sendmail.send();
} catch (Exception ex) {
}
}

}

将该程序拷贝到eclipse，写入相应的用户名和密码，运行时报如下错误：

javax.mail.SendFailedException: Sending failed;
  nested exception is: 
javax.mail.MessagingException: Could not connect to SMTP host: smtp.163.com, port: 25;
  nested exception is: 
java.net.ConnectException: Connection refused: connect
at javax.mail.Transport.send0(Transport.java:219)
at javax.mail.Transport.send(Transport.java:81)
at nl.waai.mail.MailTest.send(MailTest.java:66)
at nl.waai.mail.MailTest.main(MailTest.java:97)

经过检查发现，该错误是由于安装了McAfee杀毒软件，将该端口阻止了的缘故。

可以考虑在McAfee里面进行设置，打开该端口，由于本人是急于测试该实例，因此暂时将Mc