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