针对QQ邮箱发邮件限制的解决方案
由于QQ邮箱对于SMTP服务发送邮件做了限制，每分钟发送40封之后会被限制不能再发送，对于这样的限制又需要发送大量邮件的时候的解决方案如下
使用多个邮箱轮换使用进行发送
1、将使用的邮箱存储在一个统一的字符串变量中，将所有可使用的邮箱存储在一个字符串数组中（我的三个邮箱授权码相同，如果授权码不同，则建立一个授权码数组，和邮箱切换的解决方案同理）
全局变量（发邮件使用的邮箱）
private static String FPAMail="[email protected]";可使用的邮箱数组
private static String FPAMailArray[]={"[email protected]","[email protected]","[email protected]"};2、将建立连接的代码封装到一个函数，将连接对象变为成员变量，全局化，即每次调用同一个变量，而变量的对象可能不相同（会变化）
连接相关对象变为全局变量
private static Properties props;
private static Session mailSession;
private static MimeMessage message;
private static Transport transport;建立连接的函数
private void init()
{
System.out.println("QQ邮件服务初始化开始：账号"+FPAMail);
Date start=new Date();
try {
// 创建Properties 类用于记录邮箱的一些属性
props = new Properties();
// 表示SMTP发送邮件，必须进行身份验证
props.put("mail.smtp.auth", "true");
//此处填写SMTP服务器
props.put("mail.smtp.host", "smtp.qq.com");
//端口号，QQ邮箱给出了两个端口，但是另一个我一直使用不了，所以就给出这一个587
props.put("mail.smtp.port", "587");
// 此处填写你的账号
props.put("mail.user",FPAMail );
// 此处的密码就是前面说的16位STMP口令
props.put("mail.password", FPAMailPwd);
// 构建授权信息，用于进行SMTP进行身份验证
Authenticator authenticator = new Authenticator() {
protected PasswordAuthentication getPasswordAuthentication() {
// 用户名、密码
String userName = props.getProperty("mail.user");
String password = props.getProperty("mail.password");
return new PasswordAuthentication(userName, password);
}
};
// 使用环境属性和授权信息，创建邮件会话
mailSession = Session.getInstance(props, authenticator);// 创建邮件消息
message = new MimeMessage(mailSession);
// 设置发件人
InternetAddress form = new InternetAddress(
props.getProperty("mail.user"),NickName,"utf-8");
message.setFrom(form);
}catch (Exception e)
{
e.printStackTrace();
}
Date end=new Date();
System.out.println("QQ邮件发送会话初始化成功，耗时"+((end.getTime()-start.getTime()))+"毫秒");
}（不懂这几个对象是干嘛的百度）
3、设置每发送20封邮件切换一次邮箱，封装成函数
函数如下：
private void switchMail()
{
int i=0;
for (;i4、每次发送邮件的时候做判断（i%20==0）
public void sendToAllMember(String title,String html_content)
{
System.out.println("发送邮件给所有会员");
int i=1;
for (String mail: MemberQQMailData.mails)
{
System.out.println("正在处理第"+(i++)+"个"+"剩余"+(MemberQQMailData.mails.length-i+1)+"个，正在发送给："+mail);
sendQQMail(title,MailContentGenerator.QQMailNotice(title,html_content),mail);
if (i%20==0)
switchMail();
}
}(MemberQQMailData.mails是一个字符串数组，存有所有会员的QQ邮箱)
效果图：每到第20封邮件就换一个邮箱进行发送，完美解决QQ邮箱发送限制问题
新版解决方案代码工具类
新版工具类代码
package cn.freeprogramming.util;
import cn.hutool.core.date.StopWatch;
import lombok.extern.slf4j.Slf4j;
import org.springframework.scheduling.annotation.Async;
import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import java.util.Properties;
import java.util.concurrent.locks.ReentrantLock;
/**
* QQ邮件发送工具
*
* @Author:humorchen
* @Date 2022/1/3 20:50
*/
@Slf4j
public class QQMailUtil {
/**
* 超时时间
*/
private long TIMEOUT = 5000;
/**
* 重试次数
*/
private int RETRY_LIMIT = 10;
/**
* 使用第多少个账号（QQ每个账号限制频率了）
*/
private int accountIndex = 0;
/**
* 锁
*/
private ReentrantLock lock = new ReentrantLock(true);
/**
* 账号列表
*/
private List accountList = new ArrayList<>();
/**
* 配置列表
*/
private List propertiesList = new ArrayList<>();
/**
* 授权器
*/
private List authenticatorList = new ArrayList<>();
/**
* 会话列表
*/
private List sessionList = new ArrayList<>();
/**
* 消息对象列表
*/
private List messageList = new ArrayList<>();
/**
* 发件人地址信息列表
*/
private List internetAddressArrayList = new ArrayList<>();
/**
* 发送器列表
*/
private List transportList = new ArrayList<>();
/**
* 切换发件使用的邮箱下标
*/
private void changeUsingAccountIndex() {
if (accountIndex == accountList.size() - 1) {
accountIndex = 0;
} else {
accountIndex++;
}
}
/**
* 与QQ邮箱服务器建立连接
*
* @throws Exception
*/
private void connect() throws Exception {
QQMailAccount qqMailAccount = accountList.get(accountIndex);
Properties properties = propertiesList.get(accountIndex);
Authenticator authenticator = authenticatorList.get(accountIndex);
Session session = Session.getInstance(properties, authenticator);
MimeMessage message = new MimeMessage(session);
InternetAddress senderInternetAddress = internetAddressArrayList.get(accountIndex);
// 设置发件人
InternetAddress fromInternetAddress = new InternetAddress(
qqMailAccount.getAccount(), qqMailAccount.getNickname(), "utf-8");
message.setFrom(fromInternetAddress);
sessionList.set(accountIndex, session);
messageList.set(accountIndex, message);
Transport transport = session.getTransport(senderInternetAddress);
transport.connect();
log.info("isConnected {}", transport.isConnected());
if (accountIndex < transportList.size()) {
transportList.set(accountIndex, transport);
} else {
transportList.add(transport);
}
}
/**
* 发送邮件方法
* 由线程池处理
*
* @param title 邮件标题
* @param html_content 邮件内容（支持html，图片等内容可能会被拦截，需要用户点击查看才能看到，或者让用户设置信任这个邮箱）
* @param receiver 收件人邮箱
*/
@Async
public void sendQQMail(String title, String html_content, String receiver) {
StopWatch stopWatch = new StopWatch();
try {
lock.lock();
log.info("发送邮件给 {} ,标题：{} ,\n内容：{}", receiver, title, html_content);
stopWatch.start();
QQMailAccount qqMailAccount = accountList.get(accountIndex);
Transport transport = transportList.get(accountIndex);
MimeMessage message = messageList.get(accountIndex);
if (transport == null || !transport.isConnected()) {
connect();
}
stopWatch.stop();
log.info("连接花费 {}ms", stopWatch.getTotalTimeMillis());
stopWatch.start();
// 设置收件人的邮箱
message.setRecipient(Message.RecipientType.TO, new InternetAddress(receiver));
// 设置邮件标题
message.setSubject(title, "utf-8");
// 设置邮件的内容体
message.setContent(html_content, "text/html;charset=UTF-8");
try {
//保存修改
message.saveChanges();
//发送邮件
transport.sendMessage(message, new InternetAddress[]{new InternetAddress(receiver)});
stopWatch.stop();
log.info("使用邮箱：{} 发送成功，花费时间：{}ms", qqMailAccount.getAccount(), stopWatch.getTotalTimeMillis());
} catch (Exception e) {
//由于被腾讯方面因超时被关闭连接属于正常情况
log.info("邮件发送失败，正在尝试和QQ邮件服务器重新建立链接");
stopWatch.stop();
stopWatch.start();
boolean success = false;
for (int i = 1; i <= RETRY_LIMIT; i++) {
try {
connect();
log.info("使用邮箱：{} 成功建立链接", qqMailAccount.getAccount());
transport = transportList.get(accountIndex);
message = messageList.get(accountIndex);
success = true;
break;
} catch (Exception ee) {
changeUsingAccountIndex();
qqMailAccount = accountList.get(accountIndex);
log.info("链接建立失败,切换到邮箱：{} ,进行第 {} 次重试..." + qqMailAccount.getAccount(), i);
}
}
if (success) {
// 设置收件人的邮箱
message.setRecipient(Message.RecipientType.TO, new InternetAddress(receiver));
// 设置邮件标题
message.setSubject(title, "utf-8");
// 设置邮件的内容体
message.setContent(html_content, "text/html;charset=UTF-8");
message.saveChanges();
transport.sendMessage(message, new InternetAddress[]{new InternetAddress(receiver)});
stopWatch.stop();
log.info("重建连接后使用邮箱：{} 发送成功，耗费时间：{}ms", qqMailAccount.getAccount(), stopWatch.getTotalTimeMillis());
} else {
log.error("链接多次尝试后无法建立，邮件发送失败！");
return;
}
}
} catch (Exception e) {
log.error("sendQQMail", e);
} finally {
lock.unlock();
if (stopWatch.isRunning()) {
stopWatch.stop();
}
}
}
/**
* 添加账号
*/
public void addAccount(String account, String authorizationCode, String nickname) {
int oldAccountIndex = accountIndex;
boolean addFinished = false;
try {
lock.lock();
oldAccountIndex = accountIndex;
accountIndex = accountList.size();
QQMailAccount qqMailAccount = new QQMailAccount(account, authorizationCode, nickname);
Properties properties = createProperties(qqMailAccount);
Authenticator authenticator = createAuthenticator(qqMailAccount);
// 使用环境属性和授权信息，创建邮件会话
Session session = Session.getInstance(properties, authenticator);
MimeMessage message = new MimeMessage(session);
// 设置发件人
InternetAddress internetAddress = new InternetAddress(
account, nickname, "utf-8");
message.setFrom(internetAddress);
Transport transport = session.getTransport(new InternetAddress(qqMailAccount.getAccount()));
transport.connect();
accountList.add(qqMailAccount);
propertiesList.add(properties);
authenticatorList.add(authenticator);
sessionList.add(session);
transportList.add(transport);
messageList.add(message);
internetAddressArrayList.add(internetAddress);
addFinished = true;
} catch (Exception e) {
//移除已经加入的
if (addFinished) {
accountList.remove(accountIndex);
propertiesList.remove(accountIndex);
authenticatorList.remove(accountIndex);
sessionList.remove(accountIndex);
transportList.remove(accountIndex);
messageList.remove(accountIndex);
internetAddressArrayList.remove(accountIndex);
}
log.error("addAccount", e);
} finally {
accountIndex = oldAccountIndex;
lock.unlock();
}
}
/**
* 创建配置文件
*
* @param qqMailAccount
* @return
*/
private Properties createProperties(QQMailAccount qqMailAccount) {
// 创建Properties 类用于记录邮箱的一些属性
Properties properties = new Properties();
// 表示SMTP发送邮件，必须进行身份验证
properties.put("mail.smtp.auth", "true");
//此处填写SMTP服务器
properties.put("mail.smtp.host", "smtp.qq.com");
//端口号，QQ邮箱给出了两个端口，但是另一个我一直使用不了，所以就给出这一个587
properties.put("mail.smtp.port", "587");
// 此处填写你的账号
properties.put("mail.user", qqMailAccount.getAccount());
// 此处的密码就是前面说的16位STMP口令
properties.put("mail.password", qqMailAccount.getAuthorizationCode());
//设置超时时间
properties.put("mail.smtp.timeout", "" + TIMEOUT);
return properties;
}
/**
* 创建授权信息对象
*
* @param qqMailAccount
* @return
*/
private Authenticator createAuthenticator(QQMailAccount qqMailAccount) {
// 构建授权信息，用于进行SMTP进行身份验证
Authenticator authenticator = new Authenticator() {
@Override
protected PasswordAuthentication getPasswordAuthentication() {
// 用户名、密码
String userName = qqMailAccount.getAccount();
String password = qqMailAccount.getAuthorizationCode();
return new PasswordAuthentication(userName, password);
}
};
return authenticator;
}
private static class QQMailAccount {
/**
* 账号
*/
private String account;
/**
* 授权码
*/
private String authorizationCode;
/**
* 发送者昵称
*/
private String nickname;
public QQMailAccount(String account, String authorizationCode, String nickname) {
this.account = account;
this.authorizationCode = authorizationCode;
this.nickname = nickname;
}
public String getAccount() {
return account;
}
public void setAccount(String account) {
this.account = account;
}
public String getAuthorizationCode() {
return authorizationCode;
}
public void setAuthorizationCode(String authorizationCode) {
this.authorizationCode = authorizationCode;
}
public String getNickname() {
return nickname;
}
public void setNickname(String nickname) {
this.nickname = nickname;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
QQMailAccount that = (QQMailAccount) o;
return Objects.equals(account, that.account) && Objects.equals(authorizationCode, that.authorizationCode) && Objects.equals(nickname, that.nickname);
}
@Override
public int hashCode() {
return Objects.hash(account, authorizationCode, nickname);
}
}
} 配置工具类对象到容器
package cn.freeprogramming.config;
import cn.freeprogramming.util.QQMailUtil;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
/**
* QQ邮件配置
*
* @Author:humorchen
* @Date 2022/1/3 21:54
*/
@Configuration
public class QQMailConfig {
//授权码，在QQ邮箱里设置
private String authorizationCode = "hkkm123kasbjbf";
private String nickname = "自由编程协会";
@Bean
public QQMailUtil qqMailUtil() {
QQMailUtil qqMailUtil = new QQMailUtil();
qqMailUtil.addAccount("[email protected]", authorizationCode, nickname);
qqMailUtil.addAccount("[email protected]", authorizationCode, nickname);
qqMailUtil.addAccount("[email protected]", authorizationCode, nickname);
return qqMailUtil;
}
}