springboot多线程实现邮件发送！！！！

https://blog.csdn.net/github_39936816/article/details/80557977

https://blog.csdn.net/lu_wei_wei/article/details/80242831

@Configuration
public class ThreadPoolConfig
{
    //这些值也在配置文件配置
    // 核心线程池大小
    private int corePoolSize = 50;

    // 最大可创建的线程数
    private int maxPoolSize = 200;

    // 队列最大长度
    private int queueCapacity = 1000;

    // 线程池维护线程所允许的空闲时间
    private int keepAliveSeconds = 300;

    @Bean(name = "threadPoolTaskExecutor")
    public ThreadPoolTaskExecutor threadPoolTaskExecutor()
    {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        executor.setMaxPoolSize(maxPoolSize);
        executor.setCorePoolSize(corePoolSize);
        executor.setQueueCapacity(queueCapacity);
        executor.setKeepAliveSeconds(keepAliveSeconds);
        // 线程池对拒绝任务(无线程可用)的处理策略
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        return executor;
    }
}

调用

@Autowired
private ThreadPoolConfig threadPoolConfig;

方法中调用----->
threadPoolConfig.threadPoolTaskExecutor().execute(new Runnable() {
    @Override
    public void run() {
        try {
            String password = String.valueOf((int) ((Math.random() * 9 + 1) * 100000));
            user.setSalt(ShiroUtils.randomSalt());
            user.setPassword(passwordService.encryptPassword(loginName, password, user.getSalt()));
            if (userService.resetUserPwd(user) > 0) {
                 String content = "********";
                 mailService.sendHtmlMail(user.getEmail(), "您的登录密码已经修改！", content);
               }
            } catch (Exception e) {
                System.out.println("邮件发送异常");
                e.printStackTrace();
            }
     }
});