spring 多个切面

Posted 2022-01-07 ooo0

　　Spring也能支持多个切面。当有多个切面时，它不会存在任何顺序，这些顺序代码会随机生成，但是有时候我们希望它按照指定的顺序运行。
　　在此之前要先定义一个切点方法，为此新建一个接口——MultiBean

　　代码清单：定义多个切面的切点方法

package com.ssm.chapter11.multi.bean;

public interface MultiBean 

    public void testMulti();

 

　　代码清单：实现MultiBean接口

package com.ssm.chapter11.multi.bean.impl;

import com.ssm.chapter11.multi.bean.MultiBean;
import org.springframework.stereotype.Component;

/****************imports****************/
@Component
public class MultiBeanImpl implements MultiBean 

    // @Override
    public void testMulti() 
        System.out.println("test multi aspects!!");
    

 

　　代码清单：3个切面

package com.ssm.chapter11.multi.aspect;

import org.aspectj.lang.annotation.*;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;


/**************** imports ****************/
@Aspect
// @Order(1)
public class Aspect1 implements Ordered 

    // @Override
    public int getOrder() 
        return 1;
    

    @Pointcut("execution(* com.ssm.chapter11.multi.bean.impl.MultiBeanImpl.testMulti(..))")
    public void print() 
    

    @Before("print()")
    public void before() 
        System.out.println("before 1 ......");
    

    @After("print()")
    public void after() 
        System.out.println("after 1 ......");
    

    @AfterThrowing("print()")
    public void afterThrowing() 
        System.out.println("afterThrowing 1 ......");
    

    @AfterReturning("print()")
    public void afterReturning() 
        System.out.println("afterReturning 1 ......");
    

package com.ssm.chapter11.multi.aspect;

import org.aspectj.lang.annotation.*;
import org.springframework.core.annotation.Order;

/**************** imports ****************/
@Aspect
@Order(2)
public class Aspect2 
    @Pointcut("execution(* com.ssm.chapter11.multi.bean.impl.MultiBeanImpl.testMulti(..))")
    public void print() 
    

    @Before("print()")
    public void before() 
        System.out.println("before 2 ......");
    

    @After("print()")
    public void after() 
        System.out.println("after 2 ......");
    

    @AfterThrowing("print()")
    public void afterThrowing() 
        System.out.println("afterThrowing 2 ......");
    

    @AfterReturning("print()")
    public void afterReturning() 
        System.out.println("afterReturning 2 ......");
    

package com.ssm.chapter11.multi.aspect;

import org.aspectj.lang.annotation.*;
import org.springframework.core.annotation.Order;

/**************** imports ****************/
@Aspect
@Order(3)
public class Aspect3 
    @Pointcut("execution(* com.ssm.chapter11.multi.bean.impl.MultiBeanImpl.testMulti(..))")
    public void print() 
    

    @Before("print()")
    public void before() 
        System.out.println("before 3 ......");
    

    @After("print()")
    public void after() 
        System.out.println("after 3 ......");
    

    @AfterThrowing("print()")
    public void afterThrowing() 
        System.out.println("afterThrowing 3 ......");
    

    @AfterReturning("print()")
    public void afterReturning() 
        System.out.println("afterReturning 3 ......");
    

 

　　代码清单：多切面测试Java配置

package com.ssm.chapter11.multi.config;

import com.ssm.chapter11.multi.aspect.Aspect1;
import com.ssm.chapter11.multi.aspect.Aspect2;
import com.ssm.chapter11.multi.aspect.Aspect3;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.EnableAspectJAutoProxy;

/****************imports****************/
@Configuration
@EnableAspectJAutoProxy
@ComponentScan("com.ssm.chapter11.multi")
public class MultiConfig 
    @Bean
    public Aspect1 getAspect1() 
        return new Aspect1();
    

    @Bean
    public Aspect2 getAspect2() 
        return new Aspect2();
    

    @Bean
    public Aspect3 getAspect3() 
        return new Aspect3();
    

 

　　代码清单:测试

    public static void main(String[] args) 

        ApplicationContext ctx = new AnnotationConfigApplicationContext(MultiConfig.class);
        MultiBean multiBeanService = ctx.getBean(MultiBean.class);

        multiBeanService.testMulti();

    

 

 

如何让它有序执行:
[email protected](1),@Order(2),@Order(3) 注解
2.实现 implements Ordered
3.<aop:aspect ref="aspect1" order="1">