AOP开发

@Transactionl

在不修改源代码的前提下，对类里面的方法进行增强

前置

后置

环绕

异常

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创建项目前引入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("人吃饭"); // 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 //这个可以不加 public class ManAspect {//声明切面public static final String POINTCUT1="execution(* com.sxt.domain.Man.eat(..))";@Before(POINTCUT1)public void before(){System.out.println("饭前喝汤");}@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("出现异常:"+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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如何得到目标方法的参数和返回值

Man.java

package com.sxt.domain;import org.springframework.stereotype.Component;@Component public class Man {public void eat(){System.out.println("人吃饭"); // int a=10/0;}public String sleep(String arg){System.out.println("睡觉");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 //这个可以不加 public class ManAspect2 {//声明切面public static final String POINTCUT1="execution(* com.sxt.domain.Man.sleep(..))";//@Before(POINTCUT1)public void before(){System.out.println("喝汤");}//@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();//执行目标方法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 //这个可以不加 public class CacheAspect {//声明切面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从缓存里面查询数据Object cacheObj = null;if (cacheObj == null) {Object proceed = pjp.proceed();//执行目标方法//放入缓存//返回return proceed;} else {return cacheObj;}} }

 

总结

以上是生活随笔为你收集整理的AOP开发——在不修改源代码的前提下，对类里面的方法进行增强 ： 前置 后置 环绕 异常||如何得到目标方法的参数和返回值的全部内容，希望文章能够帮你解决所遇到的问题。

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