说实话，由于我个人某些基础不是很牢固，所以前一段时间关于 Spring Aop 踩了一个坑，其实很简单，今天就记录一下，先说结论：
不能被 Spring AOP 增强的方法：
- 基于接口的动态代理：除 public 外的其它所有的方法，此外 public static 也不能被增强
- 基于 CGLib 的动态代理：private、static、final 的方法，也就是只有 public 和 protected 可以，但是要注意切入点语法的配置
测试用例如下，pom 文件：
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.7</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.3.11.RELEASE</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.8.10</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.3.11.RELEASE</version>
</dependency>
配置文件就比较简单了：
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-2.5.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-2.5.xsd">
<context:annotation-config/>
<context:component-scan base-package="cn.bridgeli"/>
<aop:aspectj-autoproxy/>
</beans>
切面类：
package cn.bridgeli.demo.aop;
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.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;
@Aspect
@Component
public class LogInterceptor {
// @Pointcut("execution(\* \* com.bjsxt.service..*.add(..))")
@Pointcut("execution(\* cn.bridgeli.demo.service..\*.*(..))")
public void myMethod() {
}
@Before("myMethod()")
public void before() {
System.out.println("method before");
}
@Around("myMethod()")
public void aroundMethod(ProceedingJoinPoint pjp) throws Throwable {
System.out.println("method around start");
pjp.proceed();
System.out.println("method around end");
}
}
测试类：
package cn.bridgeli.demo.service;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.stereotype.Service;
@Service("userService")
public class UserService {
/**
* private方法因为修饰符访问权限的控制，无法被子类覆盖
*/
private void method1() {
System.out.println("method1 executed");
}
/**
* final 方法无法被子类覆盖
*/
private final void method2() {
System.out.println("method2 executed");
}
/**
* static 方法是类级别的方法，无法被子类覆盖
*/
private static void method3() {
System.out.println("method3 executed");
}
/**
* public 方法可以被子类覆盖，因此可以被动态字节码增强
*/
public void method4() {
System.out.println("method4 executed");
}
/**
* final 方法无法被子类覆盖
*/
public final void method5() {
System.out.println("method5 executed");
}
/**
* protected 方法可以被子类覆盖，因此可以被动态字节码增强
*/
protected void method6() {
System.out.println("method6 executed");
}
/**
* 测试
*
* @param args
*/
public static void main(String[] args) {
ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");
UserService userService = (UserService) ctx.getBean("userService");
System.out.println("initContext successfully");
System.out.println("before method1");
userService.method1();
System.out.println("after1 method1");
System.out.println("before method2");
userService.method2();
System.out.println("after1 method2");
System.out.println("before method3");
method3();
System.out.println("after1 method3");
System.out.println("before method4");
userService.method4();
System.out.println("after1 method4");
System.out.println("before method5");
userService.method5();
System.out.println("after1 method5");
System.out.println("before method6");
userService.method6();
System.out.println("after1 method6");
if (ctx != null) {
ctx.close();
}
System.out.println("close context successfully");
}
}
参考资料：