1.SMTP协议：全称为 Simple Mail Transfer Protocol，简单邮件传输协议。它定义了邮件客户端软件和SMTP邮件服务器之间，以及两台SMTP邮件服务器之间的通信规则。
2.POP3协议：全称为 Post Office Protocol，邮局协议。它定义了邮件客户端软件和POP3邮件服务器的通信规则。
3.IMAP协议：全称为 Internet Message Access Protocol,Internet消息访问协议，它是对POP3协议的一种扩展，也是定义了邮件客户端软件和IMAP邮件服务器的通信规则。

三.熟悉邮件管理上的一些限制条件设计

如邮箱格式正确与否；邮件的主题是否填写；字数是否超额；附件格式正确与否等等一系列规则。

四.掌握邮件管理功能的实现

系统开发及运行环境

操作系统：windows

Java开发包：JDK8

项目管理工具：Maven 3.9.2

项目开发工具：IntelliJ IDEA

数据库：MySQL

缓存管理工具：Redis

全局配置文件编写

我们需要把该准备的全局配置文件配置好

application.yml

application-jdbc.properties

application-mail.properties

application-redis.properties

邮件管理功能

前提

要想实现邮件的管理与发送，我们还需准备以下几个控制类才能完成

EmailMapper


package com.itheima.dao;
 
import com.itheima.model.domain.ScheduleEmail;
import org.apache.ibatis.annotations.*;
 
import java.util.List;
 
/**
 * 邮件管理
 */
@Mapper
public interface EmailMapper {
 
    // 创建定时邮件
    @Insert("INSERT INTO t_schedule_email(toaddress, schedule, subject,content,status,error,create_time) VALUES(#{toaddress}, #{schedule}, #{subject},#{content},#{status},#{error},#{createTime})")
    @Options(useGeneratedKeys = true, keyProperty = "id")
    public int insertScheduledEmail(ScheduleEmail email);
 
 
    @Select("select * from t_schedule_email where status='0' and schedule>=#{schedule}")
    public List<ScheduleEmail> queryScheduledEmail(@Param("schedule") int schedule);
 
    @Update("update t_schedule_email set status=#{status} where id=#{id}")
    public void updateScheduledEmailStatus(@Param("id") int id,@Param("status") String status);
 
    @Update("update t_schedule_email set status=#{status},error=#{error} where id=#{id}")
    public void updateScheduledEmailStatusWithError(@Param("id") int id,@Param("status") String status, @Param("error") String error);
}

ScheduleEmail


package com.itheima.model.domain;
 
import java.util.Date;
 
 
public class ScheduleEmail {
    private int id;
    private String toaddress;
    private int schedule;
    private String subject;
    private String content;
    private String status;
    private String error;
    private Date createTime;
    public ScheduleEmail(){}
    public ScheduleEmail(String toaddress, int schedule, String subject, String content, String status, String error, Date createTime) {
        this.toaddress = toaddress;
        this.schedule = schedule;
        this.subject = subject;
        this.content = content;
        this.status = status;
        this.error = error;
        this.createTime = createTime;
    }
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getToaddress() {
        return toaddress;
    }
    public void setToaddress(String toaddress) {
        this.toaddress = toaddress;
    }
    public int getSchedule() {
        return schedule;
    }
    public void setSchedule(int schedule) {
        this.schedule = schedule;
    }
    public String getSubject() {
        return subject;
    }
    public void setSubject(String subject) {
        this.subject = subject;
    }
    public String getContent() {
        return content;
    }
    public void setContent(String content) {
        this.content = content;
    }
    public String getStatus() {
        return status;
    }
    public void setStatus(String status) {
        this.status = status;
    }
    public String getError() {
        return error;
    }
    public void setError(String error) {
        this.error = error;
    }
    public Date getCreateTime() {
        return createTime;
    }
    public void setCreateTime(Date createTime) {
        this.createTime = createTime;
    }
}

EmailServiceImpl


package com.itheima.service.impl;
 
import com.itheima.dao.EmailMapper;
import com.itheima.dao.StatisticMapper;
import com.itheima.model.domain.ScheduleEmail;
 
 
import com.itheima.service.IEmailService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.mail.MailException;
import org.springframework.mail.SimpleMailMessage;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler;
import org.springframework.scheduling.support.CronTrigger;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
 
import javax.annotation.PostConstruc

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