springboot切面编程，自定义注解

目标：创建自定义注解，实现切面编程

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> 

创建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 {

}

创建Annontation的处理类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 {

    /**
     * 此处的切点是注解的方式，也可以用包名的方式达到相同的效果
     * '@Pointcut("execution(* yxm.zyf.love.service.impl.*.*(..))")'
     */
    @Pointcut("@annotation(yxm.zyf.love.annontation.AoundAnnotation)")
    public void operationLog(){}

    /**
     * 环绕通知
     * */
    @Around("operationLog()")
    public boolean doAround(ProceedingJoinPoint joinPoint) throws Throwable{
        boolean b=false;
        System.out.println("进入切面");
        return (boolean)joinPoint.proceed();
        //return b;
    }
    
    /**
     * 进入业务方法前
     * */
    @Before("operationLog()")
    public void doBeforeAdvice(JoinPoint joinPoint){
        System.out.println("进入方法前执行.....");

    }

    /**
     * 处理完请求，返回内容
     * @param ret
     */
    @AfterReturning(returning = "ret", pointcut = "operationLog()")
    public void doAfterReturning(Object ret) {
        System.out.println("方法的返回值 : " + ret);
    }

    /**
     * 后置异常通知
     */
    @AfterThrowing("operationLog()")
    public void throwss(JoinPoint jp){
        System.out.println("方法异常时执行.....");
    }


    /**
     * 后置最终通知,final增强，不管是抛出异常或者正常退出都会执行
     */
    @After("operationLog()")
    public void after(JoinPoint jp){
        System.out.println("方法最后执行.....");
    }

}

测试：

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

    @Autowired
    private AnnontationServiceTestImpl a;
    
    @Test
    public void testA() throws Exception{
        System.out.println("单元测试开始");
        a.anoundTest();
        System.out.println("单元测试完成");
    }
}