帶有身分識別驗證的JAVAMAIL編程

       如果你認為沒有必要設定MAIL伺服器，而又要用JAVAMAIL的郵件發送功能，那最好的方式就是用自己的免費郵箱伺服器！可這些伺服器登陸必須要進行驗證，所以需要進行帶有身分識別驗證的JAVAMAIL編程！
說明：
1.下載javamail.jar和JAF架構（處理多種格式）
2.用你現有的免費郵箱的郵件伺服器（需要身份認證）
3.SendEcard.java 發送mail（帶附件）的javabean
4.Email_ca.java    身份認證的javabean

package netcard;

/**
*SendEcard.java
*發送mail的javabean
*/

import java.util.Properties;
import java.util.Date;
import javax.mail.*;
import javax.mail.internet.*;
import javax.activation.*;

public class SendEcard {

  private String tomail;
  private String frommail;
  private String subject;
  private String content;
  private String imagecard;
  String smtp="****";//設定郵件伺服器

  public SendEcard() {
  }
  public String getTomail() {
    return tomail;
  }
  public void setTomail(String tomail) {
    this.tomail = tomail;
  }
  public String getFrommail() {
    return frommail;
  }
  public void setFrommail(String frommail) {
    this.frommail = frommail;
  }
  public String getSubject() {
    return subject;
  }
  public void setSubject(String subject) {
    this.subject = subject;
  }
  public String getContent() {
    return content;
  }
  public void setContent(String content) {
    this.content = content;
  }
  public String getImagecard() {
    return imagecard;
  }
  public void setImagecard(String imagecard) {
    this.imagecard = imagecard;
  }

  public boolean sendMail(){
   try{
     Properties p=System.getProperties();
     p.put("mail.smtp.host",this.smtp);
     p.put("mail.smtp.auth","true");  //設定為須驗證的模式
     Session session=Session.getDefaultInstance(p,new Email_ca("使用者名稱","密碼"));
     MimeMessage msg=new MimeMessage(session);
     msg.setSentDate(new Date());
     InternetAddress from=new InternetAddress(frommail);
     msg.setFrom(from);
     InternetAddress[] address = {
         new InternetAddress(tomail)};
     msg.setRecipients(Message.RecipientType.TO, address);
     msg.setSubject(this.subject);
     msg.setText(this.content);
     Multipart mp = new MimeMultipart();
     MimeBodyPart mbp=new MimeBodyPart();
     FileDataSource fds=new FileDataSource(檔案路徑);
     //得到附件本身並至入BodyPart
     mbp.setDataHandler(new DataHandler(fds));
     //得到檔案名稱同樣至入BodyPart
     mbp.setFileName(fds.getName());
     mp.addBodyPart(mbp);
     msg.setContent(mp);
     Transport.send(msg);
     return true;
   }catch(AddressException addr_e){
     System.out.println(addr_e.getMessage());
     return false;
   }catch(MessagingException msg_e){
     System.out.println(msg_e.getMessage());
     return false;
   }
}

}

package netcard;

/**
*Email_ca.java
*身份認證的javabean
*/

import javax.mail.*;

public class Email_ca extends javax.mail.Authenticator{
  private String user=null;
  private String pwd=null;
  public Email_ca(){
    super();
  }
  public void setUser(String user){
    this.user=user;
  }
  public void setPwd(String pwd){
    this.pwd=pwd;
  }
  public Email_ca(String user,String pwd){
    super();
    setUser(user);
    setPwd(pwd);
  }
  public PasswordAuthentication getPasswordAuthentication(){
    return new PasswordAuthentication(user,pwd);
  }
}

     至此你就可以利用免費郵箱伺服器進行郵件發送！