代码改变世界

springboot下使用多线程

2019-05-30 15:39  如是我所闻  阅读(1373)  评论(0编辑  收藏  举报

1 启动类加上异步任务注解

@SpringBootApplication
@EnableScheduling
@EnableAsync//开启异步任务
public class NpApplication{

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

    @Bean(name="taskExecutor")
    public TaskExecutor workExecutor() {//线程池配置
        ThreadPoolTaskExecutor threadPoolTaskExecutor = new ThreadPoolTaskExecutor();
        threadPoolTaskExecutor.setThreadNamePrefix("Async-");
        threadPoolTaskExecutor.setCorePoolSize(5);
        threadPoolTaskExecutor.setMaxPoolSize(20);
        threadPoolTaskExecutor.setQueueCapacity(20000);
        threadPoolTaskExecutor.afterPropertiesSet();
        return threadPoolTaskExecutor;
    }


}

 

2 在需要的方法加上@Async注解(方法内的代码为业务代码,无须纠结)

@Async
    public Future<BmloanInfoQueryResponseRoot> sendLoanQuery(BmloanInfoQueryRequestBody requestBody) throws Exception {//需要响应结果,用future包装
        BmloanInfoQueryRequestRoot root = new BmloanInfoQueryRequestRoot();
        root.setBody(requestBody);

        BmInitRequestHead.initRequestHeaderXml(root.getRequestHead(), bmChannelid, bmChanbankid, bmChanuserid, bmKhTranid);
        String sendXml = XMLUtil.convertToXml(root);
//        log.info("贷款申请信息批量查询接口请求报文:{}", sendXml);
        ESBClient esbclient = new ESBClientImpl();
        esbclient.setTimeOut(600000);
        String res = esbclient.sendSync(sendXml, bmOpenandapplyUrl);
//        log.info("贷款申请信息批量查询接口返回报文:{}", res);
        BmloanInfoQueryResponseRoot queryResponse = (BmloanInfoQueryResponseRoot) XMLUtil.convertXmlStrToObject(BmloanInfoQueryResponseRoot.class, res);
        return new AsyncResult<BmloanInfoQueryResponseRoot>(queryResponse);//包装响应结果
    }

 

3 调用异步方法方法内的代码为业务代码,无须纠结

public void syncInfo() {
		List<String> businos = loanInfoDao.listNotSynch(100);
		if (businos.size() == 0) {
			return;
		}
		int size = businos.size();
		for (int i = 0; i < businos.size(); i++) {
			String busino = businos.get(i);
			BmloanInfoQueryRequestBody body = new BmloanInfoQueryRequestBody();
			body.setBusino(busino);
			try {
				Future<BmloanInfoQueryResponseRoot> queryResFuture = bmService.sendLoanQuery(body);//这里调用的异步方法
				futures.add(queryResFuture);//将异步结果加入list中,注意不能在这里直接获取异步的结果,否则线程将阻塞,异步无效
				                           //futrues的定义===>>> List<Future<BmloanInfoQueryResponseRoot>> futures = new ArrayList<Future<BmloanInfoQueryResponseRoot>>();
				businoList.add(busino);
			} catch (Exception e) {
				log.error("贷款申请信息批量查询异常=>流水号:{},错误信息:{}", busino, e.getMessage());
			}
		}
		dataHandle();
		syncInfo();//再调用
	}

  

4 注意事项

 4.1  第三步调用异步的方法 和 第二步的异步方法不能在同一个类中。

 4.2 异步方法得定义为public。

 4.3 在@Async标注的方法,并有@Transactional注解的;在其调用数据库操作之时,将无法产生事务管理的控制,原因就在于其是基于异步处理的操作。

      可以将需要事务管理操作的方法放置到异步方法内部,在内部被调用的方法上添加@Transactional.