JAVA语言发送EMAIL的两种方法

方法一：使用类sun.net.smtp.SmtpClient
package mail;

import java.io.*;
import sun.net.smtp.*;

public class smtp{
 String server,from,to;

 public smtp(){
  server="smtp.sina.com.cn";
  from="wangtao_1979@sina.com";
  to="happy_wangtao@avl.com.cn";
 }

 public void send(){
  try{
          SmtpClient smtp=new SmtpClient(server);
          smtp.from(from);
          smtp.to(to);

          PrintStream out=smtp.startMessage();
          out.println("Hello, wangtao!");
          out.flush();
          out.close();
          smtp.closeServer();
         }catch(Exception e){
          System.out.println(e);
         }
     }

    public static void main(String args[]){
     smtp s=new smtp();
     s.send();
    }
}

方法二：使用JavaMail
package mail;

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

public class SimpleSender{
 public static void send(String smtpserver,String to,String from,String subject,String body,String addfile){                                                              
  try{
   Properties props=System.getProperties();
   props.put("mail.host",smtpserver);
   props.put("mail.transport.protocol","smtp");
   props.put("mail.smtp.host",smtpserver);
   props.put("mail.smtp.auth","true");
   
   EmailAutherticator emailautherticator=new EmailAutherticator("wangtao_1979","password");
   Session session=Session.getDefaultInstance(props,(Authenticator)emailautherticator); 
   Transport transport=session.getTransport(); 
   Message message=new MimeMessage(session);                                          
   message.setFrom(new InternetAddress(from));
   message.setRecipients(Message.RecipientType.TO,InternetAddress.parse(to,false));      
   message.setSubject(subject); 
   MimeMultipart mmp=new MimeMultipart(); 
   MimeBodyPart mbp1=new MimeBodyPart();
   mbp1.setText(body);
   mmp.addBodyPart(mbp1);
   MimeBodyPart mbp2=new MimeBodyPart();  
   mbp2.setDataHandler(new DataHandler(new FileDataSource(addfile)));   
   mbp2.setFileName((new FileDataSource(addfile)).getName());
   mmp.addBodyPart(mbp2);
   message.setContent(mmp);
   
   transport.send(message);
  }catch(Exception e){                                                                                                                                       
   e.printStackTrace();
  }                                                                                                                                
 }                                                                    

 public static void main(String args[]){
  try{  
   String smtpserver="smtp.sina.com.cn";
   String to="happy_wangtao@avl.com.cn";
   String from="wangtao_1979@sina.com";
   String subject="test";
   String body="Hello, wangtao!";
   String addfile="C:\\1.txt";
   send(smtpserver,to,from,subject,body,addfile);   
  }catch(Exception e){  
   System.out.println(e);   
  }
 }                                                    
}
自定义类Authenticator
package mail;

import javax.mail.*;

public class EmailAutherticator extends Authenticator{
 private String username,password;
 
 public EmailAutherticator(String username, String password){
  super();
  this.username=username;
  this.password=password;
 }
 
 public PasswordAuthentication getPasswordAuthentication(){
  return new PasswordAuthentication(username,password);
 }
}