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;      }  }

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);     }   }