log4j.appender.mail=org.apache.log4j.net.SMTPAppender 
log4j.appender.mail.Threshold=ERROR 
#BufferSize设置缓存多大时触发发送
log4j.appender.mail.BufferSize=0 
log4j.appender.mail.From=chenpenghui@loongtao.com
log4j.appender.mail.SMTPHost=smtp.exmail.qq.com
#very import 非常重要 SMTPUsername 
log4j.appender.mail.SMTPUsername=chenpenghui@loongtao.com
log4j.appender.mail.SMTPPassword=cph521
log4j.appender.mail.Subject=Log4J-Message-LoginSinaWeiboCookie 
log4j.appender.mail.To=chenpenghui@loongtao.com
#log4j.appender.mail.layout=org.apache.log4j.PatternLayout 
log4j.appender.mail.layout=com.test.DefaultHtmlLayout
# 显示代码行数 code line  default false
log4j.appender.mail.layout.LocationInfo=true 
#log4j.appender.mail.layout.ConversionPattern=[%-5p] %d(%r) --> [%t] %l: %m %x %n

import org.apache.log4j.HTMLLayout;

public class DefaultHtmlLayout extends HTMLLayout {
    @Override
    public String getContentType() {
        return "text/html;charset=UTF-8";
    }
}

 1 import java.util.Properties;
 2 
 3 import javax.mail.Message;
 4 import javax.mail.MessagingException;
 5 import javax.mail.Session;
 6 import javax.mail.Transport;
 7 import javax.mail.internet.InternetAddress;
 8 import javax.mail.internet.MimeMessage;
 9 
10 public class MailUtils {
11 
12     public static void main(String args[]) throws Exception, MessagingException {
13         String host = "smtp.exmail.qq.com";// 发送邮件服务器
14         String from = "xxx@xxx.com";
15         String to = "xxx@xxx.com";
16         // new properties
17         Properties props = new Properties();
18         // Setup mail server
19         props.put("mail.smtp.host", host);// 设置smtp主机
20         props.put("mail.smtp.auth", "true");// 使用smtp身份验证
21         // Get session
22         Session session = Session.getDefaultInstance(props, null);
23         // Define message
24         MimeMessage message = new MimeMessage(session);
25         message.setFrom(new InternetAddress(from));
26         message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));
27         message.setSubject("test");// 标题
28         message.setText("http://www.baidu.com/" + "This is test JavaMail");// 内容
29         // http协议部分会自动转换成超链接
30         message.saveChanges();
31         // Send message
32         Transport transport = session.getTransport("smtp");
33         System.out.println("正在连接");
34         transport.connect(host, from, "***");
35         System.out.println("正在发送");
36         transport.sendMessage(message, message.getAllRecipients());
37         System.out.println("邮件发送成功");
38     }
39 
40 }