AOP開發

@Transactionl

在不修改源代碼的前提下，對類里面的方法進行增強

前置

后置

環繞

異常

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創建項目前引入aop的包

<dependency> ????<groupId>org.springframework.boot</groupId> ????<artifactId>spring-boot-starter-aop</artifactId> </dependency

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Man.java

package com.sxt.domain;import org.springframework.stereotype.Component;@Component public class Man {public void eat(){System.out.println("人吃飯"); // int a=10/0;} }

ManAspect.java

package com.sxt.aspect;import org.aspectj.lang.ProceedingJoinPoint; import org.aspectj.lang.annotation.After; import org.aspectj.lang.annotation.AfterThrowing; import org.aspectj.lang.annotation.Aspect; import org.aspectj.lang.annotation.Before; import org.springframework.context.annotation.EnableAspectJAutoProxy; import org.springframework.stereotype.Component;@Aspect @Component @EnableAspectJAutoProxy //這個可以不加 public class ManAspect {//聲明切面public static final String POINTCUT1="execution(* com.sxt.domain.Man.eat(..))";@Before(POINTCUT1)public void before(){System.out.println("飯前喝湯");}@After(POINTCUT1)public void after(){System.out.println("搞一根");}// @Around(POINTCUT1)public void around(ProceedingJoinPoint pjp) throws Throwable {before();pjp.proceed();after();}@AfterThrowing(value = POINTCUT1,throwing = "tw")public void exp(Throwable tw){System.out.println("出現異常:"+tw.getMessage());}}

ApplicationTests.java

package com.sxt;import com.sxt.domain.Man; import org.junit.jupiter.api.Test; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.test.context.SpringBootTest;@SpringBootTest class ApplicationTests {@Autowiredprivate Man man;@Testvoid contextLoads() {man.eat();}}

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如何得到目標方法的參數和返回值

Man.java

package com.sxt.domain;import org.springframework.stereotype.Component;@Component public class Man {public void eat(){System.out.println("人吃飯"); // int a=10/0;}public String sleep(String arg){System.out.println("睡覺");return "sleep";} }

ManAspect2.java

package com.sxt.aspect;import org.aspectj.lang.ProceedingJoinPoint; import org.aspectj.lang.annotation.Around; import org.aspectj.lang.annotation.Aspect; import org.springframework.context.annotation.EnableAspectJAutoProxy; import org.springframework.stereotype.Component;@Aspect @Component @EnableAspectJAutoProxy //這個可以不加 public class ManAspect2 {//聲明切面public static final String POINTCUT1="execution(* com.sxt.domain.Man.sleep(..))";//@Before(POINTCUT1)public void before(){System.out.println("喝湯");}//@After(POINTCUT1)public void after(){System.out.println("搞一根");}@Around(POINTCUT1)public Object around(ProceedingJoinPoint pjp) throws Throwable {Object[] args = pjp.getArgs();Object arg = args[0];System.out.println(arg);before();Object proceed = pjp.proceed();//執行目標方法after();return proceed;} }

ApplicationTests.java

package com.sxt;import com.sxt.domain.Man; import org.junit.jupiter.api.Test; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.test.context.SpringBootTest;@SpringBootTest class ApplicationTests {@Autowiredprivate Man man;@Testvoid contextLoads() {String s1= man.sleep("dym");System.out.println(s1);}}

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CacheAspect.java

package com.sxt.aspect;import org.aspectj.lang.ProceedingJoinPoint; import org.aspectj.lang.annotation.Around; import org.aspectj.lang.annotation.Aspect; import org.springframework.context.annotation.EnableAspectJAutoProxy; import org.springframework.stereotype.Component;@Aspect @Component @EnableAspectJAutoProxy //這個可以不加 public class CacheAspect {//聲明切面public static final String POINTCUT1="execution(* com.sxt.service.impl.UserServiceImpl.getOne(..))";@Around(POINTCUT1)public Object cache(ProceedingJoinPoint pjp) throws Throwable {Object[] args = pjp.getArgs();String id = (String) args[0];System.out.println(id);//使用id從緩存里面查詢數據Object cacheObj = null;if (cacheObj == null) {Object proceed = pjp.proceed();//執行目標方法//放入緩存//返回return proceed;} else {return cacheObj;}} }

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總結

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