1、獲取表中最後一條資料

public static String demo() throws SQLException {
 String sql = "select * FROM baoxiu ORDER BY id DESC LIMIT 0,1;";
  PreparedStatement ptmt = conn.prepareStatement(sql);
  ResultSet rs = ptmt.executeQuery();
  String str=null;
 if(rs.next()) {
  str= rs.getString("bt");
 }
 return str; 
}

2、使用模糊查詢，獲取符合條件的所有資料

public static List<DuibiModel> getBaoX(String bt) throws SQLException {
 String sql = "select bt,`user`.cardid,phone FROM baoxiu,`user` WHERE baoxiu.cardid=`user`.cardid AND bt LIKE '%"+bt+"%'";
  PreparedStatement ptmt = conn.prepareStatement(sql);
  ResultSet rs = ptmt.executeQuery(); 
 List<DuibiModel> list = new ArrayList<>() ;
 while(rs.next()) {
  DuibiModel duibi=new DuibiModel();
  duibi.setBt(rs.getString("bt"));
  duibi.setCardid(rs.getString("cardid"));
  duibi.setPhone(rs.getString("phone"));
  list.add(duibi);
 }
 return list; 
}

3、Java 傳送郵件

import javax.mail.Authenticator;
import javax.mail.PasswordAuthentication;
 
public class Auth extends Authenticator {
 
 private String username = "";
 private String password = "";
 
 public Auth(String username,String password) {
  this.username = username;
  this.password = password;
 }
 public PasswordAuthentication getPasswordAuthentication() {
  return new PasswordAuthentication(username,password);
 } 
}

import java.util.Properties;
import javax.mail.Message;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

public class SendMail {

 private Properties props; //系統屬性
 private Session mailSession; //郵件會話物件
 private MimeMessage mimeMsg; //MIME郵件物件

 public SendMail(String SMTPHost,String Port,String MailUsername,String MailPassword) {
  Auth au = new Auth(MailUsername,MailPassword);
  //設定系統屬性
  props=java.lang.System.getProperties(); //獲得系統屬性物件
  props.put("mail.smtp.host",SMTPHost); //設定SMTP主機
  props.put("mail.smtp.port",Port); //設定服務埠號
  props.put("mail.smtp.auth","true"); //同時通過驗證
  //獲得郵件會話物件 
  mailSession = Session.getInstance(props,au);
 }

 public boolean sendingMimeMail(String MailFrom,String MailTo,String MailCopyTo,String MailBCopyTo,String MailSubject,String MailBody) {
  try { 
   //建立MIME郵件物件
   mimeMsg=new MimeMessage(mailSession);
   //設定發信人
   mimeMsg.setFrom(new InternetAddress(MailFrom));
   //設定收信人
   if(MailTo!=null){
    mimeMsg.setRecipients(Message.RecipientType.TO,InternetAddress.parse(MailTo));
   } 
   //設定抄送人
   if(MailCopyTo!=null){
    mimeMsg.setRecipients(javax.mail.Message.RecipientType.CC,InternetAddress.parse(MailCopyTo));
   }
   //設定暗送人
   if(MailBCopyTo!=null){
    mimeMsg.setRecipients(javax.mail.Message.RecipientType.BCC,InternetAddress.parse(MailBCopyTo));
   }
   //設定郵件主題 
   mimeMsg.setSubject(MailSubject,"utf-8");
   //設定郵件內容，將郵件body部分轉化為HTML格式
   mimeMsg.setContent(MailBody,"text/html;charset=utf-8");
   //傳送郵件
   Transport.send(mimeMsg);
   return true;
  } catch (Exception e) {
   e.printStackTrace();
   return false;
  }
 }
}

public static boolean email(String email,String str) {
 String SMTPHost="smtp.qq.com";
 String Port="25";
 String MailUsername="[email protected]"; //直接用我的郵件進行傳送測試
 String MailPassword="wggddlvcrqfubhde"; //密碼請勿修改
 SendMail sendMail=new  SendMail(SMTPHost,Port,MailUsername,MailPassword); 
 String MailFrom="[email protected]"; //發件人
 String MailTo=email; //收件人
 String MailCopyTo=null; //抄送人
 String MailBCopyTo=null; //暗送人
 String MailSubject="發現類似商品"; //郵件主題
 String MailBody=str; //郵件內容
 //傳送郵件
 boolean isSend=sendMail.sendingMimeMail(MailFrom,MailTo,MailCopyTo,MailBCopyTo,MailSubject,MailBody);
 return isSend;
}

4、main方法

public static void main(String[] args) throws SQLException {
 boolean flag = false;
 String str=demo();
 for(DuibiModel duibiModel : getBaoX(str)) {
  System.out.println("名稱為:"+duibiModel.getBt()+","+"身份證號："+duibiModel.getCardid()+","+"電話號碼為："+duibiModel.getPhone());
  flag=email("[email protected]",duibiModel.getBt());
 }
 if(flag) {
  System.out.println("郵件傳送成功");
 }else {
  System.out.println("郵件傳送失敗");
 }
}

總結

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