SpringBoot @Async 异步处理业务逻辑和发短信逻辑

有个业务场景，业务数据审核通过后需要给用户发短信，发短信过程比较耗时，可能需要几秒甚至十几秒，因此使用异步发短信

使用了注解@Async来实现：

1.SpringApplication启用注解@EnableAsync

@SpringBootApplication
@ImportResource(locations = { "classpath:/spring/spring-*.xml" })
@EnableTransactionManagement(proxyTargetClass=true)
@EnableScheduling
@EnableAutoConfiguration(exclude = { FreeMarkerAutoConfiguration.class })
@EnableSwagger2
@ServletComponentScan(basePackages="com.xx")
@EnableMongoRepositories(basePackages = "com.xx.xx.xx.xx")
@EnableAsync
public class IemsApplication {

	public static void main(String[] args) {
		SpringApplication.run(IemsApplication.class, args);
	}
    ...

2.在业务层（@Service）具体的审核方法上添加注释@Async

@Async
public void cancelAudit(DefectForm defectForm) {
	Map<String,Object> params = new HashMap<>();
	params.put("defectId", defectForm.getDefectId()); //缺陷记录ID
	params.put("defectStatus", 3); //更新缺陷记录状态审核拒绝
	params.put("reason", defectForm.getReason()); //拒绝理由
	defectRecordDao.updateByPrimaryKeySelective(params);
	　　　　 //上面是业务处理，下面是发短信
	//审核拒绝发送短信,短信发送给缺陷上报人，缺陷内容，审核拒绝理由
	Account account = accountDao.findAccountById(xxx);
	if(account != null && StringUtils.isNotBlank(account.getMobile())){
		String mobile = account.getMobile();
		String defectContent = defectForm.getDefectContent();
		String reason = defectForm.getReason();
		Map<String,String> templateData = new HashMap<>();
		templateData.put("defectContent", defectContent);
		templateData.put("reason", reason);
		smsService.sendSms(null, mobile, SmsConstant.DEFECT_REFUSRD_CODE, templateData,false);
		logger.debug("缺陷上报记录审核拒绝，发送短信给缺陷记录上报人******");
	}
}

3.前端逻辑：

/**
 * 审核拒绝，确定
 * @returns
 */
function makeRefuse(){
	var reason = $("#refuse_reason").val();
	if (reason==null || reason.trim()==""){
		AppUtils.showTooltip("请填写拒绝理由！",false);
		return;
	}
	var curDefect = recordsJson[xxx];
	$.ajax({
		url: path + ‘/xxx/xxx/qqq/cancelAudit‘,
		type: ‘post‘,
		dataType: ‘json‘,
		data:curDefect,
		success: function(data){
			if(data=="ok"){
				AppUtils.showTooltip("审核拒绝成功！",true);
				$("#topForm").attr("action",path + ‘/xxx/xxx/xxx‘);
				$("#topForm").submit();
			}
		}
	});
}

4.Controller层

@RequestMapping("/xxx/xxx/cancelAudit")
@ResponseBody
public String cancelAudit(DefectForm defectForm){
	defectRecordService.cancelAudit(defectForm);
	return "ok";
}

经测试，可以异步更新、发送短信

但是，发现一个严重的问题：前台页面点击取消审核后页面状态偶尔能刷新过来，偶尔还是之前的状态，重新查询一次后，页面显示正常

分析代码：Controller层代码写的有问题，Controller层调用Service层（defectRecordService.cancelAudit(defectForm);），Service层cancelAudit(DefectForm defectForm)方法整个是@Async，

主线程会直接返回，而新启的线程处理Service层的逻辑。这样ajax返回前台，前台再去刷新数据的时候，可能新启线程Service的更新逻辑还没处理完，这样就导致了页面刷新状态错误的问题

其实：我们期望的是，业务逻辑（更新操作）执行完成后再返回；整个业务逻辑（更新操作完成，返回）与发短信异步

修改后的代码：

1.Controller层

@RequestMapping("/xxx/xxx/cancelAudit")
	@ResponseBody
	public String cancelAudit(DefectForm defectForm){
		defectRecordService.cancelAudit(defectForm); //更新操作，成功后往下走，sendCancelAuditMsg会新启一个线程处理，主线程继续往下走，走到return "ok";返回 
		//审核拒绝：业务操作完成后发短信
		defectRecordService.sendCancelAuditMsg(defectForm);
		return "ok";
	}

2.Service层

//这里我们就不需要添加异步注解了
public void cancelAudit(DefectForm defectForm) {
		Map<String,Object> params = new HashMap<>();
		params.put("defectId", defectForm.getDefectId()); //缺陷记录ID
		params.put("defectStatus", 3); //更新缺陷记录状态审核拒绝
		params.put("reason", defectForm.getReason()); //拒绝理由
		defectRecordDao.updateByPrimaryKeySelective(params);
	}

//把发短信的逻辑抽出来，单独一个方法，使用异步注解
@Async
public void sendCancelAuditMsg(DefectForm defectForm){
	//审核拒绝发送短信,短信发送给缺陷上报人，缺陷内容，审核拒绝理由
	Account account = accountDao.findAccountById(defectForm.getCreatorUserid());
	if(account != null && StringUtils.isNotBlank(account.getMobile())){
		String mobile = account.getMobile();
		String defectContent = defectForm.getDefectContent();
		String reason = defectForm.getReason();
		Map<String,String> templateData = new HashMap<>();
		templateData.put("defectContent", defectContent);
		templateData.put("reason", reason);
		smsService.sendSms(null, mobile, SmsConstant.DEFECT_REFUSRD_CODE, templateData,false);
		logger.debug("缺陷上报记录审核拒绝，发送短信给缺陷记录上报人******");
	}
}

至此问题就解决了，写博客标注一下　

原文地址：https://www.cnblogs.com/ph7seven/p/9549824.html