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1.xml中声明Bean

<!-- AbortPolicy:直接抛出java.util.concurrent.RejectedExecutionException异常 -->
	<!-- CallerRunsPolicy:主线程直接执行该任务，执行完之后尝试添加下一个任务到线程池中，可以有效降低向线程池内添加任务的速度 -->
	<!-- DiscardOldestPolicy:丢弃队列最前面的任务，然后重新尝试执行任务（重复此过程） -->
	<!-- DiscardPolicy:抛弃当前任务，但是不抛出异常；会导致被丢弃的任务无法再次被执行 -->
	<bean id="mailrejectedExecutionHandler" class="java.util.concurrent.ThreadPoolExecutor$AbortPolicy"/>

	<!-- 发送邮件线程池 -->
	<bean id="mailThreadPool" class="org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor" destroy-method="destroy">
		<property name="corePoolSize" value="${email.threadPool.corePoolSize|8}"/>
		<property name="maxPoolSize" value="${email.threadPool.maxPoolSize|10}"/>
		<property name="queueCapacity" value="${email.threadPool.queueCapacity|10000}"/>
		<property name="rejectedExecutionHandler" ref="mailrejectedExecutionHandler"/>
		<property name="allowCoreThreadTimeOut" value="${email.threadPool.allowCoreThreadTimeOut|true}"/>
		<property name="keepAliveSeconds" value="${email.threadPool.keepAliveSeconds|30}"/>
	</bean>

2.properties文件中声明线程池的核心连接数 最大连接数 最大队列长度 等参数

email.threadPool.corePoolSize=8
email.threadPool.maxPoolSize=10
email.threadPool.queueCapacity=10000
email.threadPool.allowCoreThreadTimeOut=true
email.threadPool.keepAliveSeconds=30

3.java代码中注入MailThreadPool

@Lazy
@Service("emailService")
public class EmailServiceImpl implements EmailService {
    @Autowired
    private ThreadPoolTaskExecutor mailThreadPool;
	
    public void doTradePdfSendCustEmail(Map<String,Object> map){
        try {

            mailThreadPool.execute(() -> {
                try {
                    LOGGER.info("{}线程执行发送邮件方法,邮件模板内容map={}", Thread.currentThread().getName(), map);
                    TimeUnit.MILLISECONDS.sleep(10000);
                  //TODO 发送逻辑
                } catch (InterruptedException | ParseException e) {
                    LOGGER.info("发送通知给客户={}失败:{}", e, e.getMessage());
                }
            });

         
        }catch (Exception e){
             LOGGER.info("发送通知给客户={}失败:{}", e, e.getMessage());
        }
    }
}