### 使用@Async實現異步調用 啟動加上@EnableAsync，需要執行異步方法上加入@Async 在方法加上@Async之后 底層使用多線程技術 ~~~ @Service @Slf4j public class MemberService { @Async//相當于這個方法重新開辟了單獨線程進行執行 public String addMemberAndEmail(){ log.info("2"); try { Thread.sleep(5000); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } log.info("3"); return "hello"; } } ~~~ ~~~ @Slf4j @RestController public class MemberController { @Autowired private MemberService memberService; @RequestMapping("/addMemberAndEmail") public String addMemberAndEmail(){ log.info("1"); String result=memberService.addMemberAndEmail(); log.info("4"); return result; } } ~~~ 運行結果  ~~~ 啟動類上要加@EnableAsync注解 @EnableAsync//開啟異步調用 public class AppConfig {} ~~~ ~~~ 實現原理 @Service @Slf4j public class MemberService { //@Async//相當于這個方法重新開辟了單獨線程進行執行 //思路：使用AOP技術在運行時創建一個單獨線程進行執行 public String addMemberAndEmail(){ new Thread(new Runnable() { @Override public void run() { // TODO Auto-generated method stub log.info("2"); try { Thread.sleep(5000); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } log.info("3"); } }).start(); return "hello"; // log.info("2"); // try { // Thread.sleep(5000); // } catch (InterruptedException e) { // // TODO Auto-generated catch block // e.printStackTrace(); // } // log.info("3"); // return "hello"; } } ~~~