SpringBoot AOP AspectJ切面技术介绍与实现方式

目录AspectJ简介什么是AspectJ实现AOP的方式原生使用切面通过注解使用切面AspectJ简介它不属于spring；AspectJ是一个AOP的框架；定义了AOP语法；有一个专门的编译器用来...

目录

AspectJ简介

Spring AOP 回顾

什么是AspectJ

实现AOP的方式

原生使用切面

添加AOP坐标

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

创建增强类MyAOP

对service层下的所有类的所有方法进行增强

@Component
@Aspect
public class MyAOP {
    //定义切点
    @Pointcut("execution(* com.moming.service.*.*(..))")
    public void point(){}
    @Before("point()")
    public void before(){
        System.out.println("===>前置通知");
    }
    @After("point()")
    public void after(){
        System.out.println("===>后置通知");
    }
    @Around("point()")
    public Object arround(ProceedingJoinPoint pjp) throws Throwable {
        System.out.println("===>环绕前");
        Object resules = pjp.proceed();
        System.out.println("===>环绕后");
        return resules;
    }
    @AfterReturning(value = "point()",returning = "ret")
    public void returning(JoinPoint jp, String ret){
        Object[] args = jp.getArgs();
        System.out.println("返回后通知获取参数: "+Arrays.toString(args));
        System.out.println("===>返回后通知,返回值: "+ret);
    }
    @AfterThrowing("point()")
    public void throwing(){
        System.out.println("===>异常通知");
    }
}

service/OrderService

@Service
public class OrderService {
    public String order(int id){
        System.out.println("===>目标方法:订单业务ID:"+id);
        return "001202210121010";
    }
}

启动类测试

@SpringBootApplication
public class App2 {
    public static void main(String[] args) {
        ConfigurableApplicationContext context = SpringApplication.run(App2.class, args);
        OrderService bean = context.getBean(OrderService.class);
        System.out.println(bean.order(1));
    }
}

无异常时

有异常时,后续代码就不再执行了

补充配置说明

//两种占位符
//* 代表的是一个单词，b* 代表的是以b开头的单词。 例如 bds
//.. 通配符 ，代表的是0个或者多个匹配项

通过注解使用切面

声明注解NeedCut

@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE,ElementType.METHOD})
public @interface NeedCut {
}

切换注解

@Component
@Aspect
public class MyAOP {
    //定义切点
    @Pointcut("@annotation(com.moming.annotation.NeedCut)")
    public void point(){}
    @Before("point()")
    public void before(){
        System.out.println("===>前置通知");
    }
    @After("point()")
    public void after(){
        System.out.println("===>后置通知");
    }
    @Around("point()")
    public Object arround(ProceedingJoinPoint pjp) throws Throwable {
        System.out.println("===>环绕前");
        Object resules = pjp.proceed();
        System.out.println("===>环绕后");
        return resules;
    }
    @AfterReturning(value = "point()",returning = "ret")
    public void returning(JoinPoint jp, String ret){
        Object[] args = jp.getArgs();
        System.out.println("返回后通知获取参数: "+Arrays.toString(args));
        System.out.println("===>返回后通知,返回值: "+ret);
    }
    @AfterThrowing("point()")
    public void throwing(){
        System.out.println("===>异常通知");
    }
}

使用注解@NeedCut

@Service
public class OrderService {
    @NeedCut
    public String order(int id){
        System.out.println("===>目标方法:订单业务ID:"+id);
        return "001202210121010";
    }
    public void add(){
        System.out.println("===>添加订单");
    }
}

测试

@SpringBootApplication
public class App2 {
    public static void main(String[] args) {
        ConfigurableApplicationContext context = SpringApplication.run(App2.class, args);
        OrderService bean = context.getBean(OrderService.class);xYzne
        System.out.println(bean.order(01));
        System.out.println("-------------------");
        bean.add();
    }
}

使用@NeedCut注解的方法才进行增强

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