Spring面向切面编程——Spring实现AOP方式——通过注解实现

Log.java:

package log;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;

@Aspect
public class Log {
@Before("execution(* service.UserServiceImp.*(..))")
public void before(){
System.out.println("方法执行前");
}

@After("execution(* service.UserServiceImp.*(..))")
public void after(){
System.out.println("方法执行后");
}

@Around("execution(* service.UserServiceImp.*(..))")
public Object around(ProceedingJoinPoint jp) throws Throwable {
System.out.println("环绕前");
System.out.println("签名"+jp.getSignature());
/*执行目标方法*/
Object result = jp.proceed();
System.out.println("环绕后");
return result;
}
}

UserService.java:

package service;

public interface UserService {
public void add();
public void delete();
public void search();
public void update();
}

UserServiceImp.java:

package service;

public class UserServiceImp implements UserService {
@Override
public void add() {
System.out.println("增加用户");
}

@Override
public void delete() {
System.out.println("删除用户");
}

@Override
public void search() {
System.out.println("查找用户");
}

@Override
public void update() {
System.out.println("修改用户");
}
}

applicationContext.xml:

<?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:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd"> <bean id="userService" class="service.UserServiceImp"/>
<bean id="log" class="log.Log"/>
<!--会自动去找aop-->
<aop:aspectj-autoproxy/>
</beans>

Test.java:

package test;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import service.UserService;

public class Test {
public static void main(String[] args) {
ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
UserService userService = (UserService) applicationContext.getBean("userService");
userService.add();
}
}

测试结果：

环绕前
签名void service.UserService.add()
方法执行前
增加用户
环绕后
方法执行后