springboot异步多线程发邮件

二、实现异步发送邮件

在SpringBoot项目中开启异步多线程非常简单，只需要下面几个步骤即可。

在主类上面开启@EnableAsync注解

……
@EnableAsync
public class EmosWxApiApplication {
	……

@Configuration
public class ThreadPoolConfig {
    @Bean("AsyncTaskExecutor")
    public AsyncTaskExecutor taskExecutor() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        // 设置核心线程数
        executor.setCorePoolSize(8);
        // 设置最大线程数
        executor.setMaxPoolSize(16);
        // 设置队列容量
        executor.setQueueCapacity(32);
        // 设置线程活跃时间（秒）
        executor.setKeepAliveSeconds(60);
        // 设置默认线程名称
        executor.setThreadNamePrefix("task-");
        // 设置拒绝策略
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        executor.initialize();
        return executor;
    }
}

　　在com.example.emos.wx.task中创建EmailTask类，定义线程任务

@Component
@Scope("prototype")
public class EmailTask implements Serializable {
    @Autowired
    private JavaMailSender javaMailSender;

    @Value("${emos.email.system}")
    private String mailbox;

    @Async("AsyncTaskExecutor")
    public void sendAsync(SimpleMailMessage message){
        message.setFrom(mailbox);
        javaMailSender.send(message);
    }
}

　　

@Value("${emos.email.hr}")
private String hrEmail;

@Autowired
private EmailTask emailTask;

　　

HashMap<String, String> map = userDao.searchNameAndDept(userId);
String name = map.get("name");
String deptName = map.get("dept_name");
deptName = deptName != null ? deptName : "";
SimpleMailMessage message = new SimpleMailMessage();
message.setTo(hrEmail);
message.setSubject("员工" + name + "身处高风险疫情地区警告");
message.setText(deptName + "员工" + name + "，" + DateUtil.format(new Date(), "yyyy年MM月dd日") + "处于" + address + "，属于新冠疫情高风险地区，请及时与该员工联系，核实情况！");
emailTask.sendAsync(message);