javamail发送邮件的简单例子

在进行邮件发送的时候遇到了2个问题，

java.lang.NoClassDefFoundError: com/sun/mail/util/BEncoderStream
java.lang.NoClassDefFoundError: com/sun/mail/util/LineInputStream

这2个问题是由于java本身的mail包和mail.jar和activation有冲突，解决这一问题的办法就是去myeclipse中的plugins里找到
X:\MyEclipse\plugins\com.genuitec.eclipse.j2eedt.core_8.4.100.me200912151537\data\libraryset\EE_5下的javaee.jar用解压工具打开，进入javax文件夹(也有可能是包)找到里面的mail和activation并删除它(做下备份)

原文链接地址

下面主要就是代码实现

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;

public class EmailDemo {
// 邮箱服务器
private String host = "smtp.163.com";
// 这个是你的邮箱用户名
private String username = "**********@163.com";
// 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 = "*****@qq.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";

private void send() throws Exception {
try {
Properties props = new Properties(); // 获取系统环境
Authenticator auth = new Email_Autherticator(username,password ); // 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) {
throw new Exception(ex.getMessage());
}
}

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) {
EmailDemo demo = new EmailDemo();
try {
demo.send();
} catch (Exception e) {
e.printStackTrace();
}
}
}