@Target({ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface Async {

 /**
  * A qualifier value for the specified asynchronous operation(s).
  * <p>May be used to determine the target executor to be used when executing this
  * method, matching the qualifier value (or the bean name) of a specific
  * {@link java.util.concurrent.Executor Executor} or
  * {@link org.springframework.core.task.TaskExecutor TaskExecutor}
  * bean definition.
  * <p>When specified on a class level {@code @Async} annotation, indicates that the
  * given executor should be used for all methods within the class. Method level use
  * of {@code Async#value} always overrides any value set at the class level.
  * @since 3.1.2
  */
 String value() default "";

}

@Target({ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented

package com.example.demo;

import com.example.demo.properties.ApplicationPro;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.annotation.EnableScheduling;

@SpringBootApplication
@EnableConfigurationProperties({ApplicationPro.class})
//開啟@Async注解的自動配置
@EnableAsync
public class DemoApplication {

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

}

package com.example.demo.service;

import com.example.demo.Student;
import org.springframework.scheduling.annotation.Async;
import org.springframework.scheduling.annotation.AsyncResult;
import org.springframework.stereotype.Service;

import java.util.concurrent.Future;

@Service
@Async
public class AsyncService {
 public Future<Student> get(){
  Student stu=new Student("1","3");
  try {
   Thread.sleep(10000l);
  } catch (InterruptedException e) {
   e.printStackTrace();
  }
  return AsyncResult.forValue(stu);
 }

 public void executeRemote(){
  try {
   Thread.sleep(10000l);
  } catch (InterruptedException e) {
   e.printStackTrace();
  }
 }
}

public Future<Student> get(){
  Student stu=new Student("1","3");
  try {
   Thread.sleep(10000l);
  } catch (InterruptedException e) {
   e.printStackTrace();
  }
  return AsyncResult.forValue(stu);
 }

package com.example.demo.controller;

import com.example.demo.Student;
import com.example.demo.service.AsyncService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
@Controller
@RequestMapping("async")
public class ControllerAsyncTest {
 @Autowired
 private AsyncService asyncService;
 @RequestMapping("/test")
 @ResponseBody
 public Student get(){
  try {
  long start=System.currentTimeMillis();  //調用帶有返回值的get方法
  Future<Student> result=asyncService.get();  //調用無返回值的executeRemote方法
  asyncService.executeRemote();
  
  Student student=result.get();
  long end=System.currentTimeMillis();
  System.out.println("執(zhí)行時間："+(end-start));
  return student;
  } catch (InterruptedException e) {
   e.printStackTrace();
  } catch (ExecutionException e) {
   e.printStackTrace();
  }
  return null;
 }
}

Future<Student> result=asyncService.get();
asyncService.executeRemote();
//獲得執(zhí)行結果
Student student=result.get();