jsp如何发送邮件？

自动发送我认为不可能真正实现，还是需要人工操作的。
你可以自己写个bean的。package mail;
import javax.mail.*;
import javax.mail.internet.*;
import javax.activation.*;
import java.util.*;
public class SendMail{
    private String from;
    private String to;
private String subject;
private String content;
private String smtp;
private String user;
private String pass;
private String mess;
public void sendMail(){
  try{ 
        Properties props = new Properties(); 
        Session sendMailSession; 
        Store store;
        Transport transport;
        sendMailSession = Session.getInstance(props, null);
        props.setProperty("mail.transport.protocol","smtp");
        props.setProperty("mail.smtp.host",smtp); 
        props.setProperty("mail.smtp.auth","true");
        sendMailSession = Session.getInstance(props,
            new Authenticator() {
                protected PasswordAuthentication getPasswordAuthentication() {
                    return new PasswordAuthentication(user,pass);
                }
            });
        Message newMessage = new MimeMessage(sendMailSession); 
        newMessage.setFrom(new InternetAddress(from)); 
        newMessage.setRecipient(Message.RecipientType.TO, new InternetAddress(to)); 
        newMessage.setSubject(subject); 
        newMessage.setSentDate(new Date()); 
        newMessage.setText(content); 
        transport = sendMailSession.getTransport(); 
        transport.send(newMessage); 
        transport.close();
        this.mess="信件发送成功！";
      }catch(SendFailedException e){
        System.out.println(e.toString());
this.mess=e.toString();
      }catch(MessagingException e){ 
        System.out.println(e.toString());
this.mess=e.toString();
      } 
}
public void setFrom(String from){
  this.from=from;
}
    public void setTo(String to){
  this.to=to;
}
public void setSubject(String subject){
  this.subject=subject;
}
public void setContent(String content){
  this.content=content;
}
public void setSmtp(String smtp){
  this.smtp=smtp;
}
public void setUser(String user){
  this.user=user;
}
public void setPass(String pass){
  this.pass=pass;
}
public String getMess(){
  return this.mess;
}
}这是一个发信的bean。希望可对你有帮助。