(转)用javamail发送带附件的邮件

本文转载自：http://redleaf.iteye.com/blog/78217

mail.java 代码

    package mail;  

    import java.util.* ;
    import java.io.* ;
    import javax.mail.* ;
    import javax.mail.internet.* ;
    import javax.activation.* ;
    public class Mail {
        //定义发件人、收件人、SMTP服务器、用户名、密码、主题、内容等
        private String displayName;
        private String to;
        private String from;
        private String smtpServer;
        private String username;
        private String password;
        private String subject;
        private String content;
        private boolean ifAuth; //服务器是否要身份认证
        private String filename="";
        private Vector file = new Vector(); //用于保存发送附件的文件名的集合  

        /**
         * 设置SMTP服务器地址
         */
        public void setSmtpServer(String smtpServer){
            this.smtpServer=smtpServer;
        }  

        /**
         * 设置发件人的地址
         */
        public void setFrom(String from){
            this.from=from;
        }
        /**
         * 设置显示的名称
         */
        public void setDisplayName(String displayName){
            this.displayName=displayName;
        }  

        /**
         * 设置服务器是否需要身份认证
         */
        public void setIfAuth(boolean ifAuth){
            this.ifAuth=ifAuth;
        }  

        /**
         * 设置E-mail用户名
         */
        public void setUserName(String username){
            this.username=username;
        }  

        /**
         * 设置E-mail密码
         */
        public void setPassword(String password){
            this.password=password;
        }  

        /**
         * 设置接收者
         */
        public void setTo(String to){
            this.to=to;
        }  

        /**
         * 设置主题
         */
        public void setSubject(String subject){
            this.subject=subject;
        }  

        /**
         * 设置主体内容
         */
        public void setContent(String content){
            this.content=content;
        }  

        /**
         * 该方法用于收集附件名
         */
        public void addAttachfile(String fname){
            file.addElement(fname);
        }  

        public Mail(){  

        }  

        /**
         * 初始化SMTP服务器地址、发送者E-mail地址、用户名、密码、接收者、主题、内容
         */
        public Mail(String smtpServer,String from,String displayName,String username,String password,String to,String subject,String content){
            this.smtpServer=smtpServer;
            this.from=from;
            this.displayName=displayName;
            this.ifAuth=true;
            this.username=username;
            this.password=password;
            this.to=to;
            this.subject=subject;
            this.content=content;
        }  

        /**
         * 初始化SMTP服务器地址、发送者E-mail地址、接收者、主题、内容
         */
        public Mail(String smtpServer,String from,String displayName,String to,String subject,String content){
            this.smtpServer=smtpServer;
            this.from=from;
            this.displayName=displayName;
            this.ifAuth=false;
            this.to=to;
            this.subject=subject;
            this.content=content;
        }  

        /**
         * 发送邮件
         */
        public HashMap send(){
            HashMap map=new HashMap();
            map.put("state", "success");
            String message="邮件发送成功！";
            Session session=null;
            Properties props = System.getProperties();
            props.put("mail.smtp.host", smtpServer);
            if(ifAuth){ //服务器需要身份认证
                props.put("mail.smtp.auth","true");
                SmtpAuth smtpAuth=new SmtpAuth(username,password);
                session=Session.getDefaultInstance(props, smtpAuth);
            }else{
                props.put("mail.smtp.auth","false");
                session=Session.getDefaultInstance(props, null);
            }
            session.setDebug(true);
            Transport trans = null;
            try {
                Message msg = new MimeMessage(session);
                try{
                    Address from_address = new InternetAddress(from, displayName);
                    msg.setFrom(from_address);
                }catch(java.io.UnsupportedEncodingException e){
                    e.printStackTrace();
                }
                InternetAddress[] address={new InternetAddress(to)};
                msg.setRecipients(Message.RecipientType.TO,address);
                msg.setSubject(subject);
                Multipart mp = new MimeMultipart();
                MimeBodyPart mbp = new MimeBodyPart();
                mbp.setContent(content.toString(), "text/html;charset=gb2312");
                mp.addBodyPart(mbp);
                if(!file.isEmpty()){//有附件
                    Enumeration efile=file.elements();
                    while(efile.hasMoreElements()){
                        mbp=new MimeBodyPart();
                        filename=efile.nextElement().toString(); //选择出每一个附件名
                        FileDataSource fds=new FileDataSource(filename); //得到数据源
                        mbp.setDataHandler(new DataHandler(fds)); //得到附件本身并至入BodyPart
                        mbp.setFileName(fds.getName());  //得到文件名同样至入BodyPart
                        mp.addBodyPart(mbp);
                    }
                    file.removeAllElements();
                }
                msg.setContent(mp); //Multipart加入到信件
                msg.setSentDate(new Date());     //设置信件头的发送日期
                //发送信件
                msg.saveChanges();
                trans = session.getTransport("smtp");
                trans.connect(smtpServer, username, password);
                trans.sendMessage(msg, msg.getAllRecipients());
                trans.close();  

            }catch(AuthenticationFailedException e){
                 map.put("state", "failed");
                 message="邮件发送失败！错误原因：\n"+"身份验证错误!";
                 e.printStackTrace();
            }catch (MessagingException e) {
                 message="邮件发送失败！错误原因：\n"+e.getMessage();
                 map.put("state", "failed");
                 e.printStackTrace();
                 Exception ex = null;
                 if ((ex = e.getNextException()) != null) {
                     System.out.println(ex.toString());
                     ex.printStackTrace();
                 }
            }
            //System.out.println("\n提示信息:"+message);
            map.put("message", message);
            return map;
        }  

    }  

SmtpAuth.java 代码

    package mail;  

    public class SmtpAuth extends javax.mail.Authenticator {
        private String username,password;   

        public SmtpAuth(String username,String password){
            this.username = username;
            this.password = password;
        }
        protected javax.mail.PasswordAuthentication getPasswordAuthentication() {
            return new javax.mail.PasswordAuthentication(username,password);
        }
    }