@Async注解的坑-编程知识

@Async注解的坑

问题描述

一个方法调用另一个方法(该方法使用@Async注解)在同一个类文件中，该注解会失效！

问题复现

TestAsyncController 类

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.scheduling.annotation.Async;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;@RestController
@RequestMapping("/test")
public class TestAsyncController {private static final Logger logger = LoggerFactory.getLogger(TestAsyncController.class);@PostMapping("/test")public void test() {logger.info("测试异步开始...");try {test1();} catch (Exception e) {e.printStackTrace();}logger.info("测试异步结束...");}@Asyncpublic void test1(){for(int i=0;i<5;i++){logger.info("i={}",i);}}
}

问题测试结果

可以看出是全部使用的主线程

问题解决

将@Async注解的方法放在一个新的类文件中即可

TestAsyncService类

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Service;@Service
public class TestAsyncService {private static final Logger logger = LoggerFactory.getLogger(TestAsyncService.class);@Asyncpublic void test1(){for(int i=0;i<5;i++){logger.info("i={}",i);}}
}

TestAsyncController类

import com.example.demo.service.TestAsyncService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;@RestController
@RequestMapping("/test")
public class TestAsyncController {private static final Logger logger = LoggerFactory.getLogger(TestAsyncController.class);@Autowiredprivate TestAsyncService asyncService;@PostMapping("/test")public void test() {logger.info("测试异步开始...");try {asyncService.test1();} catch (Exception e) {e.printStackTrace();}logger.info("测试异步结束...");}
}