java异步回调应用场景,Java异步调用系列之@Async使用

素颜马尾好姑娘i 2023-01-16 04:52 90阅读 0赞

一、代码清单一(成功demo)

@EnableAsync+@Async

1，启动类

@Configuration

@EnableAutoConfiguration

@ComponentScan(basePackages = \{"com.sun.test.\*"\})

@EnableAsync

public class TestApplication \{

public static void main(String\[\] args) \{

SpringBootApplication.run(LogicCephApplication.class, args);

2，Controller

@Controller

@RequestMapping(value = "/api/v1/aync")

public class TestController \{

@Autowired

TestService testService;

@RequestMapping(value = "/", method = RequestMethod.GET)

@ResponseBody

public List testAync() \{

List list = new ArrayList();

for (int i = 0; i < 10; i++) \{

Future> res = testService.getValue(i);

try \{

list.addAll(res.get());

\} catch (InterruptedException e) \{

e.printStackTrace();

\} catch (ExecutionException e) \{

e.printStackTrace();

return list;

3, TestService

@Service

public class TestService \{

Logger logger = LoggerFactory.getLogger(TestService.class);

@Async

public Future> getValue(int i) \{

logger.debug("==== thread id: \{\}", Thread.currentThread());

logger.debug("==== i: \{\}", i);

List list = new ArrayList(10);

for (int j = 1; j <= 10; j++) \{

// 1-10

list.add(i \* 10 + j);

logger.debug("==== list: \{\}", list);

return new AsyncResult>(list);

测试&&结果

curl -XGET http://localhost:8700/api/v1/aync/

\[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100\]

![b56d02d5f744][]

image.png

成功。

注意

1，不加@EnableAsync注解

若在启动类上不加@EnableAsync注解，则异步调用不生效,发现都是用的主线程

![b56d02d5f744][]

image.png

2，异步调用报错

可以捕获res.get()语句进行处理

3，在同一类中，非异步方法调用异步方法，异步调动失效

解决办法：

1)把这两个方法分开到不同的类中；

2)把注解加到类名上面；

目前测试方法1)比较好用和控制

二、代码清单二(比较全面的测试demo)

包含

异步调用成功demo

异步调用过程中异常

同一类中异步调用失效

1，启动类

@Configuration

@EnableAutoConfiguration

@ComponentScan(basePackages = \{"com.sun.test.\*"\})

@EnableAsync

public class TestApplication \{

public static void main(String\[\] args) \{

SpringBootApplication.run(LogicCephApplication.class, args);

2，Controller

@Controller

@RequestMapping(value = "/api/v1/aync")

public class TestController \{

@Autowired

TestService testService;

@Autowired

TestService2 testService2;

/\*\*

\* 成功demo

\* @return

\*/

@RequestMapping(value = "/", method = RequestMethod.GET)

@ResponseBody

public List testAync() \{

List list = new ArrayList();

for (int i = 0; i < 10; i++) \{

Future> res = testService.getValue(i);

try \{

list.addAll(res.get());

\} catch (InterruptedException e) \{

e.printStackTrace();

\} catch (ExecutionException e) \{

e.printStackTrace();

return list;

/\*\*

\* 异步调用过程异常

\* @return

\*/

@RequestMapping(value = "/testException", method = RequestMethod.GET)

@ResponseBody

public List testAyncWithException() \{

List list = new ArrayList();

for (int i = 0; i < 10; i++) \{

Future> res = testService.getValueWithException(i);

try \{

list.addAll(res.get());

\} catch (InterruptedException e) \{

e.printStackTrace();

\} catch (ExecutionException e) \{

e.printStackTrace();

return list;

/\*\*

\* 同一类中调用失效

\* @return

\*/

@RequestMapping(value = "/test1", method = RequestMethod.GET)

@ResponseBody

public List test1() \{

List list = testService.test1();

return list;

/\*\*

\* 调用类和异步调用类分离

\* @return

\*/

@RequestMapping(value = "/test2", method = RequestMethod.GET)

@ResponseBody

public List test2() \{

List list = testService2.test2();

return list;

3, TestService

@Service

public class TestService \{

Logger logger = LoggerFactory.getLogger(TestService.class);

@Async

public Future> getValue(int i) \{

logger.debug("==== thread id: \{\}", Thread.currentThread());

logger.debug("==== i: \{\}", i);

List list = new ArrayList(10);

for (int j = 1; j <= 10; j++) \{

// 1-10

list.add(i \* 10 + j);

logger.debug("==== list: \{\}", list);

return new AsyncResult>(list);

@Async

public Future> getValueWithException(int i) \{

logger.debug("==== thread id: \{\}", Thread.currentThread());

logger.debug("==== i: \{\}", i);

if(i == 2)\{

throw new RuntimeException();

List list = new ArrayList(10);

for (int j = 1; j <= 10; j++) \{

// 1-10

list.add(i \* 10 + j);

logger.debug("==== list: \{\}", list);

return new AsyncResult>(list);

public List test1()\{

List list = new ArrayList();

for (int i = 0; i < 10; i++) \{

Future> res = getValue(i);

try \{

list.addAll(res.get());

\} catch (InterruptedException e) \{

e.printStackTrace();

\} catch (ExecutionException e) \{

e.printStackTrace();

return list;

4, TestService2

@Service

public class TestService2 \{

@Autowired

TestService testService;

Logger logger = LoggerFactory.getLogger(TestService2.class);

public List test2()\{

List list = new ArrayList();

for (int i = 0; i < 10; i++) \{

Future> res = testService.getValue(i);

try \{

list.addAll(res.get());

\} catch (InterruptedException e) \{

e.printStackTrace();

\} catch (ExecutionException e) \{

e.printStackTrace();

return list;

5，测试

调用成功demo

curl -XGET http://localhost:8700/api/v1/aync/

调用过程中异常情况

curl -XGET http://localhost:8700/api/v1/aync/testException

java异步回调应用场景,Java异步调用系列之@Async使用

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