Java Mail

 import java.io.BufferedReader; 
 import java.io.BufferedWriter; 
 import java.io.IOException; 
 import java.io.InputStreamReader; 
 import java.io.OutputStreamWriter; 
 import java.net.Socket; 
 import java.net.SocketException; 
 import java.net.UnknownHostException; 
 import java.util.StringTokenizer; 
  
 import sun.misc.BASE64Encoder; 
  
 public class SMTPClient { 
  
  private boolean debug=true; 
  BASE64Encoder encode=new BASE64Encoder();//用于加密后发送用户名和密码 
  public static void main(String[] args) throws UnknownHostException, IOException { 
   // TODO Auto-generated method stub 
   MailMessage message=new MailMessage(); 
   message.setFrom("[e-mail]");//发件人 
   message.setTo("[e-mail]");//收件人 
   String server="smtp.163.com";//邮件服务器 
   //String server="smtpcom.263xmail.com";//邮件服务器 
   message.setSubject("test");//邮件主题 
   message.setContent("test");//邮件内容 
   message.setDatafrom("[e-mail]");//发件人，在邮件的发件人栏目中显示 
   message.setDatato("[e-mail]");//收件人，在邮件的收件人栏目中显示 
   message.setUser("[e-mail]");//登陆邮箱的用户名 
   message.setPassword("555555");//登陆邮箱的密码 
    
   SMTPClient smtp=new SMTPClient(server,25); 
   boolean flag; 
   flag=smtp.sendMail(message,server); 
   if(flag){ 
    System.out.println("邮件发送成功！"); 
   } 
   else{ 
    System.out.println("邮件发送失败！"); 
   } 
  
  } 
  private Socket socket; 
  public SMTPClient(String server,int port) throws UnknownHostException, IOException{ 
   try{ 
    socket=new Socket(server,port); 
   }catch(SocketException e){ 
    System.out.println(e.getMessage()); 
   }catch(Exception e){ 
    e.printStackTrace(); 
   }finally{ 
    System.out.println("已经建立连接!"); 
   } 
  
  } 
  //注册到邮件服务器 
  public void helo(String server,BufferedReader in,BufferedWriter out) throws IOException{ 
   int result; 
   result=getResult(in); 
   //连接上邮件服务后,服务器给出220应答 
   if(result!=220){ 
    throw new IOException("连接服务器失败"); 
   } 
   result=sendServer("HELO "+server,in,out); 
   //HELO命令成功后返回250 
   if(result!=250) 
   { 
    throw new IOException("注册邮件服务器失败！"); 
   } 
  } 
   
  private int sendServer(String str,BufferedReader in,BufferedWriter out) throws IOException{ 
   out.write(str); 
   out.newLine(); 
   out.flush(); 
   if(debug) 
   { 
    System.out.println("已发送命令:"+str); 
   } 
   return getResult(in); 
  } 
  public int getResult(BufferedReader in){ 
   String line=""; 
   try{ 
    line=in.readLine(); 
    if(debug){ 
     System.out.println("服务器返回状态:"+line); 
    } 
   }catch(Exception e){ 
    e.printStackTrace(); 
   } 
   //从服务器返回消息中读出状态码,将其转换成整数返回 
   StringTokenizer st=new StringTokenizer(line," "); 
   return Integer.parseInt(st.nextToken()); 
  } 
   
  public void authLogin(MailMessage message,BufferedReader in,BufferedWriter out) throws IOException{ 
   int result; 
   result=sendServer("AUTH LOGIN",in,out); 
   if(result!=334){ 
    throw new IOException("用户验证失败！"); 
   } 
    
    result=sendServer(encode.encode(message.getUser().getBytes()),in,out); 
    if(result!=334){ 
    throw new IOException("用户名错误！");  
    } 
    result=sendServer(encode.encode(message.getPassword().getBytes()),in,out); 
    
    if(result!=235){ 
     throw new IOException("验证失败！");  
   } 
  } 
  //开始发送消息，邮件源地址 
  public void mailfrom(String source,BufferedReader in,BufferedWriter out) throws IOException{ 
   int result; 
   result=sendServer("MAIL FROM:<"+source+">",in,out); 
   if(result!=250){ 
    throw new IOException("指定源地址错误"); 
   } 
  } 
  // 设置邮件收件人 
  public void rcpt(String touchman,BufferedReader in,BufferedWriter out) throws IOException{ 
   int result; 
   result=sendServer("RCPT TO:<"+touchman+">",in,out); 
   if(result!=250){ 
    throw new IOException("指定目的地址错误！"); 
   } 
  } 
   
  //邮件体 
  public void data(String from,String to,String subject,String content,BufferedReader in,BufferedWriter out) throws IOException{ 
   int result; 
   result=sendServer("DATA",in,out); 
   //输入DATA回车后,若收到354应答后,继续输入邮件内容 
   if(result!=354){ 
    throw new IOException("不能发送数据"); 
   } 
   out.write("From: "+from); 
   out.newLine(); 
   out.write("To: "+to); 
   out.newLine(); 
   out.write("Subject: "+subject); 
   out.newLine(); 
   out.newLine(); 
   out.write(content); 
   out.newLine(); 
   //句号加回车结束邮件内容输入 
   result=sendServer(".",in,out); 
   System.out.println(result); 
   if(result!=250) 
   { 
    throw new IOException("发送数据错误"); 
   } 
  } 
   
  //退出 
  public void quit(BufferedReader in,BufferedWriter out) throws IOException{ 
   int result; 
   result=sendServer("QUIT",in,out); 
   if(result!=221){ 
    throw new IOException("未能正确退出"); 
   } 
  } 
   
  //发送邮件主程序 
  public boolean sendMail(MailMessage message,String server){ 
   try{ 
    BufferedReader in=new BufferedReader(new InputStreamReader(socket.getInputStream())); 
    BufferedWriter out=new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())); 
    helo(server,in,out);//HELO命令 
    authLogin(message,in,out);//AUTH LOGIN命令 
    mailfrom(message.getFrom(),in,out);//MAIL FROM 
    rcpt(message.getTo(),in,out);//RCPT 
    data(message.getDatafrom(),message.getDatato(),message.getSubject(),message.getContent(),in,out);//DATA 
    quit(in,out);//QUIT 
   }catch(Exception e){ 
    e.printStackTrace(); 
    return false; 
     
   } 
   return true; 
  } 
  
 } 

 public class MailMessage { 
   
  private String from; 
  private String to; 
  private String datafrom; 
  private String datato; 
  private String subject; 
  private String content; 
  private String date; 
  private String user; 
  private String password; 
  
  public String getPassword() { 
   return password; 
  } 
  
  public void setPassword(String password) { 
   this.password = password; 
  } 
  
  public String getUser() { 
   return user; 
  } 
  
  public void setUser(String user) { 
   this.user = user; 
  } 
  
  public String getContent() { 
   return content; 
  } 
  
  public void setContent(String content) { 
   this.content = content; 
  } 
  
  public String getDatafrom() { 
   return datafrom; 
  } 
  
  public void setDatafrom(String datafrom) { 
   this.datafrom = datafrom; 
  } 
  
  public String getDatato() { 
   return datato; 
  } 
  
  public void setDatato(String datato) { 
   this.datato = datato; 
  } 
  
  public String getDate() { 
   return date; 
  } 
  
  public void setDate(String date) { 
   this.date = date; 
  } 
  
  public String getFrom() { 
   return from; 
  } 
  
  public void setFrom(String from) { 
   this.from = from; 
  } 
  
  public String getSubject() { 
   return subject; 
  } 
  
  public void setSubject(String subject) { 
   this.subject = subject; 
  } 
  
  public String getTo() { 
   return to; 
  } 
  
  public void setTo(String to) { 
   this.to = to; 
  } 
  
 }