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来源:CSDN
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
(相关资料图)
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="freeprogramming@qq.com";
可使用的邮箱数组
private static String FPAMailArray[]={"freeprogramming@qq.com","humorchen@vip.qq.com","3301633914@qq.com"};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 */@Slf4jpublic 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 */@Configurationpublic 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("freeprogramming@qq.com", authorizationCode, nickname); qqMailUtil.addAccount("freeprogramming@foxmail.com", authorizationCode, nickname); qqMailUtil.addAccount("357341307@qq.com", authorizationCode, nickname); return qqMailUtil; }} 