spring通知执行的顺序
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关于spring aop的具体使用，暂时不在这里讲解，后面会特定来讲解，本次主要探讨spring中通知执行的顺序。
spring中通知分为以下几种：
- before：前置通知，在方法执行之前执行
- around：环绕通知，在方法执行前后执行
- afterreturning：在方法执行成功后执行
- afterthrowning：异常通知，在方法发生异常后执行
- after：后置通知，在方法执行之后执行（不管方法执行成功还是失败）
下面我们将每种通知创建两个，代码如下：
1、before通知2个
package com.cn.aop.demo4;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;
/**
* 我的技术网站 2016/11/17 0017.
*/
@Component
@Aspect
@Order(100000)
public class Before1 {
@Before(value = "execution(* com.cn.aop.demo4.*Impl.*(..))")
public void exec(){
Order order = this.getClass().getAnnotation(Order.class);
System.out.println(Before1.class+" Before通知 order = "+order.value());
}
}
package com.cn.aop.demo4;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;
/**
* 我的技术网站 2016/11/17 0017.
*/
@Component
@Aspect
@Order(100000)
public class Before2 {
@Before(value = "execution(* com.cn.aop.demo4.*Impl.*(..))")
public void exec(){
Order order = this.getClass().getAnnotation(Order.class);
System.out.println(Before2.class+" Before通知 order = "+order.value());
}
}
2、around通知2个
package com.cn.aop.demo4;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;
/**
* 我的技术网站 2016/11/17 0017.
*/
@Component
@Aspect
@Order(100000)
public class Around1 {
@Around(value = "execution(* com.cn.aop.demo4.*Impl.*(..))")
public Object exec(ProceedingJoinPoint invocation) throws Throwable {
Order order = this.getClass().getAnnotation(Order.class);
System.out.println(Around1.class+" Around通知 order = "+order.value()+" start");
Object result = invocation.proceed();
System.out.println(Around1.class+" Around通知 order = "+order.value()+" end");
return result;
}
}
package com.cn.aop.demo4;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;
/**
* 我的技术网站 2016/11/17 0017.
*/
@Component
@Aspect
@Order(100000)
public class Around2 {
@Around(value = "execution(* com.cn.aop.demo4.*Impl.*(..))")
public Object exec(ProceedingJoinPoint invocation) throws Throwable {
Order order = this.getClass().getAnnotation(Order.class);
System.out.println(Around2.class+" Around通知 order = "+order.value()+" start");
Object result = invocation.proceed();
System.out.println(Around2.class+" Around通知 order = "+order.value()+" end");
return result;
}
}
3、
afterreturning通知2个
package com.cn.aop.demo4;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;
/**
* 我的技术网站 2016/11/17 0017.
*/
@Component
@Aspect
@Order(100000)
public class AfterReturning1 {
@AfterReturning(value = "execution(* com.cn.aop.demo4.*Impl.*(..))")
public void exec(){
Order order = this.getClass().getAnnotation(Order.class);
System.out.println(AfterReturning1.class+" AfterReturning通知 order = "+order.value());
}
}
package com.cn.aop.demo4;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.AfterThrowing;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;
/**
* 我的技术网站 2016/11/17 0017.
*/
@Component
@Aspect
@Order(100000)
public class AfterReturning2 {
@AfterReturning(value = "execution(* com.cn.aop.demo4.*Impl.*(..))")
public void exec(){
Order order = this.getClass().getAnnotation(Order.class);
System.out.println(AfterReturning2.class+" AfterReturning通知 order = "+order.value());
}
}
4、
afterthrowning通知2个
package com.cn.aop.demo4;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.AfterThrowing;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;
/**
* 我的技术网站 2016/11/17 0017.
*/
@Component
@Aspect
@Order(100000)
public class AfterThrowing1 {
@AfterThrowing(value = "execution(* com.cn.aop.demo4.*Impl.*(..))")
public void exec(){
Order order = this.getClass().getAnnotation(Order.class);
System.out.println(AfterThrowing1.class+" AfterThrowing通知 order = "+order.value());
}
}
package com.cn.aop.demo4;
import org.aspectj.lang.annotation.AfterThrowing;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;
/**
* 我的技术网站 2016/11/17 0017.
*/
@Component
@Aspect
@Order(100000)
public class AfterThrowing2 {
@AfterThrowing(value = "execution(* com.cn.aop.demo4.*Impl.*(..))")
public void exec(){
Order order = this.getClass().getAnnotation(Order.class);
System.out.println(AfterThrowing2.class+" AfterThrowing通知 order = "+order.value());
}
}
5、after通知两个
package com.cn.aop.demo4;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;
/**
* 我的技术网站 2016/11/17 0017.
*/
@Component
@Aspect
@Order
public class After1 {
@After(value = "execution(* com.cn.aop.demo4.*Impl.*(..))")
public void exec(){
Order order = this.getClass().getAnnotation(Order.class);
System.out.println(After1.class+" After通知 order = "+order.value());
}
}
package com.cn.aop.demo4;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;
/**
* 我的技术网站 2016/11/17 0017.
*/
@Component
@Aspect
@Order(100000)
public class After2 {
@After(value = "execution(* com.cn.aop.demo4.*Impl.*(..))")
public void exec(){
Order order = this.getClass().getAnnotation(Order.class);
System.out.println(After2.class+" After通知 order = "+order.value());
}
} 6、其他文件
- 声明1个接口和一个实现类，在本实现类上面添加上面10个通知
package com.cn.aop.demo4;
/**
* 我的技术网站 2016/11/15 0015.
*/
public interface IAService {
String m1();
void m2();
}
package com.cn.aop.demo4;
import org.springframework.stereotype.Component;
import javax.annotation.Resource;
/**
* 我的技术网站 2016/11/15 0015.
*/
@Component("aservice")
public class AServiceImpl implements IAService {
public String m1()
{
System.out.println(AServiceImpl.class+".m1()");
return AServiceImpl.class+".m1()";
}
@Override
public void m2() {
int i=0;
System.out.println(10/i);
}
}
- spring配置文件spring-demo4.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.1.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.1.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.1.xsd" default-autowire="byName">
<aop:aspectj-autoproxy />
<context:component-scan base-package="com.cn.aop.demo4"/>
</beans>
- 测试类
package com.cn.aop.demo4;
import org.springframework.context.support.ClassPathXmlApplicationContext;
/**
* 我的技术网站 2016/11/17 0017.
*/
public class Client {
public static void main(String[] args) {
ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("classpath:/aop/spring-demo4.xml");
IAService aservice = context.getBean("aservice", IAService.class);
System.out.println("\n========================\n");
aservice.m1();
System.out.println("\n========================\n");
try {
aservice.m2();
} catch (Exception e){
//暂时不输出错误信息
}
}
}
1、上面所有拦截器的order都为100000，执行结果如下
======================== class com.cn.aop.demo4.Around1 Around通知 order = 100000 start class com.cn.aop.demo4.Around2 Around通知 order = 100000 start class com.cn.aop.demo4.Before1 Before通知 order = 100000 class com.cn.aop.demo4.Before2 Before通知 order = 100000 class com.cn.aop.demo4.AServiceImpl.m1() class com.cn.aop.demo4.Around2 Around通知 order = 100000 end class com.cn.aop.demo4.Around1 Around通知 order = 100000 end class com.cn.aop.demo4.AfterReturning1 AfterReturning通知 order = 100000 class com.cn.aop.demo4.AfterReturning2 AfterReturning通知 order = 100000 class com.cn.aop.demo4.After2 After通知 order = 100000 class com.cn.aop.demo4.After1 After通知 order = 100000 ======================== class com.cn.aop.demo4.Around1 Around通知 order = 100000 start class com.cn.aop.demo4.Around2 Around通知 order = 100000 start class com.cn.aop.demo4.Before1 Before通知 order = 100000 class com.cn.aop.demo4.Before2 Before通知 order = 100000 class com.cn.aop.demo4.AfterThrowing2 AfterThrowing通知 order = 100000 class com.cn.aop.demo4.AfterThrowing1 AfterThrowing通知 order = 100000 class com.cn.aop.demo4.After2 After通知 order = 100000 class com.cn.aop.demo4.After1 After通知 order = 100000
Before1 @Order(1) Before2 @Order(2)client执行结果
======================== class com.cn.aop.demo4.Before1 Before通知 order = 1 class com.cn.aop.demo4.Before2 Before通知 order = 2 class com.cn.aop.demo4.Around1 Around通知 order = 100000 start class com.cn.aop.demo4.Around2 Around通知 order = 100000 start class com.cn.aop.demo4.AServiceImpl.m1() class com.cn.aop.demo4.Around2 Around通知 order = 100000 end class com.cn.aop.demo4.Around1 Around通知 order = 100000 end class com.cn.aop.demo4.AfterReturning1 AfterReturning通知 order = 100000 class com.cn.aop.demo4.AfterReturning2 AfterReturning通知 order = 100000 class com.cn.aop.demo4.After2 After通知 order = 100000 class com.cn.aop.demo4.After1 After通知 order = 100000 ======================== class com.cn.aop.demo4.Before1 Before通知 order = 1 class com.cn.aop.demo4.Before2 Before通知 order = 2 class com.cn.aop.demo4.Around1 Around通知 order = 100000 start class com.cn.aop.demo4.Around2 Around通知 order = 100000 start class com.cn.aop.demo4.AfterThrowing2 AfterThrowing通知 order = 100000 class com.cn.aop.demo4.AfterThrowing1 AfterThrowing通知 order = 100000 class com.cn.aop.demo4.After2 After通知 order = 100000 class com.cn.aop.demo4.After1 After通知 order = 100000
3、修改配置
Before1 @Order(1) Before2 @Order(2) AfterReturning1 @Order(1) AfterReturning2 @Order(1000001) AfterThrowing1 @Order(1) AfterThrowing2 @Order(1000001) After1 @Order(1) After2 @Order(1000001)执行结果：
======================== class com.cn.aop.demo4.Before1 Before通知 order = 1 class com.cn.aop.demo4.Before2 Before通知 order = 2 class com.cn.aop.demo4.Around1 Around通知 order = 100000 start class com.cn.aop.demo4.Around2 Around通知 order = 100000 start class com.cn.aop.demo4.AServiceImpl.m1() class com.cn.aop.demo4.AfterReturning2 AfterReturning通知 order = 1000001 class com.cn.aop.demo4.After2 After通知 order = 1000001 class com.cn.aop.demo4.Around2 Around通知 order = 100000 end class com.cn.aop.demo4.Around1 Around通知 order = 100000 end class com.cn.aop.demo4.AfterReturning1 AfterReturning通知 order = 1 class com.cn.aop.demo4.After1 After通知 order = 1 ======================== class com.cn.aop.demo4.Before1 Before通知 order = 1 class com.cn.aop.demo4.Before2 Before通知 order = 2 class com.cn.aop.demo4.Around1 Around通知 order = 100000 start class com.cn.aop.demo4.Around2 Around通知 order = 100000 start class com.cn.aop.demo4.AfterThrowing2 AfterThrowing通知 order = 1000001 class com.cn.aop.demo4.After2 After通知 order = 1000001 class com.cn.aop.demo4.AfterThrowing1 AfterThrowing通知 order = 1 class com.cn.aop.demo4.After1 After通知 order = 1
结论：
1、无异常情况
- 所有通知order一样，执行顺序：around start -> before ->around start -> afterreturning -> after
- before.order < around.order，执行顺序： before -> around start
- afterreturning.order > around.order，执行顺序：afterreturning -> around end
- after.order > around.order，执行顺序：after -> around end
- after.order >afterreturning.order，执行顺序： after -> afterreturning
2、异常情况
- 所有通知order一样，执行顺序：around start -> before -> afterthrowing -> after
- before.order < around.order，执行顺序： before -> around start
- after.order > afterthrowing .order，执行顺序：after -> afterthrowing
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