4.3 Demo 给用户发送生日祝福邮件

1.

package com.xiaowei.birthday;

import java.sql.SQLException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.Timer;
import java.util.TimerTask;

import javax.mail.MessagingException;
import javax.mail.internet.AddressException;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

import com.xiaowei.domain.BirthdayPerson;
import com.xiaowei.domain.Person;
import com.xiaowei.email.MailUtils;
import com.xiaowei.service.BirthdayService;

//1.实现ServletContextListener接口
public class BirthdayListener implements ServletContextListener {

	// 2.重写这个接口的方法
	// 3.在web.xml文件中注册
	//启动
	public void contextInitialized(ServletContextEvent sce) {
		// 当web应用启动 开启任务调动---功能在用户的生日当前发送邮件
		// 4.开启一个定时器
		Timer time = new Timer();
		/*
		 * task:一个任务
		 * firstTime:开发中起始时间是一个固定的时间
		 * period:开发中间隔时间是1天
		 */
		time.scheduleAtFixedRate(new TimerTask() {
			
			public void run() {
//				5.为当前过生日的用户发送邮件
//				5.1 获取今天谁过生日 
//				今天的日期 将今天的日期转成字符串
				SimpleDateFormat format = new SimpleDateFormat("MM-dd");
				String currentTime = format.format(new Date());				
				
//				6.将今天的日期传到service层 获取过生日的人的集合
				BirthdayService service = new BirthdayService();
				List<BirthdayPerson> birthdayPersonList = null;
					try {
						birthdayPersonList = service.findBirthdayList(currentTime);
					} catch (SQLException e) {
						e.printStackTrace();
					}
//				11.向集合中的这些人发邮件
					if (birthdayPersonList != null && birthdayPersonList.size() > 0) {
						for (BirthdayPerson person : birthdayPersonList) {
							String message = "hello"+person.getUsername()+"  happy birthday";
							try {
								MailUtils.sendMail(person.getEmail(), "生日提醒", message);
								System.out.println(person.getRealname()+"的邮件已经发送完毕");
							} catch (Exception e) {
								e.printStackTrace();
							} 
						}
					}	
			}
		}, new Date(), 1000*60*60*24);
	}

	public void contextDestroyed(ServletContextEvent sce) {
	}
}

1.1web.xml文件中的配置

  <listener>
  		<listener-class>com.xiaowei.birthday.BirthdayListener</listener-class>
  </listener>

2.service层

package com.xiaowei.service;

import java.sql.SQLException;
import java.util.List;

import com.xiaowei.dao.BirthdayDao;
import com.xiaowei.domain.BirthdayPerson;

public class BirthdayService {

//	7.根据时间获取当前过生日的人的集合
	public List findBirthdayList(String currentTime) throws SQLException {
		BirthdayDao dao = new BirthdayDao();
		List<BirthdayPerson> birthdayPersonList = dao.findBirthdayList(currentTime);
		return birthdayPersonList;
	}
}

3.dao层

package com.xiaowei.dao;

import java.sql.SQLException;
import java.util.List;

import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanListHandler;

import com.xiaowei.domain.BirthdayPerson;
import com.xiaowei.utils.DataSourceUtils;

public class BirthdayDao {
	
//	8.根据时间获取当前过生日的人的集合
	public List findBirthdayList(String currentTime) throws SQLException {	
		
//		9.导入连接Mysql dbutils c3p0的包 数据库连接池工具类 c3p0配置文件
//		10.创建queryrunner对象
		QueryRunner runner = new QueryRunner(DataSourceUtils.getDataSource());
		String sql = "select * from person where birthday like ?";
		List<BirthdayPerson> birthdayPersonList = runner.query(sql, new BeanListHandler<BirthdayPerson>(BirthdayPerson.class),"%"+currentTime+"%");
		return birthdayPersonList;
	}
}

4.实体类

package com.xiaowei.domain;

public class BirthdayPerson {
	
	private int id;
	private String username;
	private String password;
	private String realname;
	private String birthday;
	private String email;
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	public String getRealname() {
		return realname;
	}
	public void setRealname(String realname) {
		this.realname = realname;
	}
	public String getBirthday() {
		return birthday;
	}
	public void setBirthday(String birthday) {
		this.birthday = birthday;
	}
	public String getEmail() {
		return email;
	}
	public void setEmail(String email) {
		this.email = email;
	}	
}