springboot切面編程，自定義注解

目標：創建自定義注解，實現切面編程

 

首先在pom文件加入：

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-aop</artifactId>
        </dependency>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjrt</artifactId>
        </dependency>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
        </dependency> 

創建Annontation：

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface AoundAnnotation {

}

 

創建Annontation的處理類aspect

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.AfterThrowing;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;

@Aspect
@Component
public class AoundAnnotationAspect {

    /**
     * 此處的切點是注解的方式，也可以用包名的方式達到相同的效果
     * '@Pointcut("execution(* yxm.zyf.love.service.impl.*.*(..))")'
     */
    @Pointcut("@annotation(yxm.zyf.love.annontation.AoundAnnotation)")
    public void operationLog(){}

    /**
     * 環繞通知
     * */
    @Around("operationLog()")
    public boolean doAround(ProceedingJoinPoint joinPoint) throws Throwable{
        boolean b=false;
        System.out.println("進入切面");
        return (boolean)joinPoint.proceed();
        //return b;
    }
    
    /**
     * 進入業務方法前
     * */
    @Before("operationLog()")
    public void doBeforeAdvice(JoinPoint joinPoint){
        System.out.println("進入方法前執行.....");

    }

    /**
     * 處理完請求，返回內容
     * @param ret
     */
    @AfterReturning(returning = "ret", pointcut = "operationLog()")
    public void doAfterReturning(Object ret) {
        System.out.println("方法的返回值 : " + ret);
    }

    /**
     * 后置異常通知
     */
    @AfterThrowing("operationLog()")
    public void throwss(JoinPoint jp){
        System.out.println("方法異常時執行.....");
    }


    /**
     * 后置最終通知,final增強，不管是拋出異常或者正常退出都會執行
     */
    @After("operationLog()")
    public void after(JoinPoint jp){
        System.out.println("方法最后執行.....");
    }

}

測試：

@RunWith(SpringRunner.class)
@SpringBootTest(classes = DemoApplication.class)
public class TestAnnotation {

    @Autowired
    private AnnontationServiceTestImpl a;
    
    @Test
    public void testA() throws Exception{
        System.out.println("單元測試開始");
        a.anoundTest();
        System.out.println("單元測試完成");
    }
}