Spring的学习过程

<?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/beanss
https://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop
https://www.springframework.org/schema/aop/spring-aop.xsd">

<!--注册bean-->
<bean id="userservice" class="com.service.UserServiceImp"></bean>
<bean id="log" class="com.log.Log"/>
<bean id="afterlog" class="com.log.AfterLog"/>

<!--配置aop-->
<aop:config>
<!--切入点：expression:表达式，execution（要执行的位置）-->
<aop:pointcut id="point" expression="execution(* com.service.UserServiceImp.*(..))"/>
<!--执行环绕-->
<aop:advisor advice-ref="log" pointcut-ref="point"/>
<aop:advisor advice-ref="afterlog" pointcut-ref="point"/>
</aop:config>

</beans>
public class UserServiceImp implements UserService {

public void add() {
System.out.println("add");
}

public void delete() {
System.out.println("delete");
}

public void query() {
System.out.println("query");
}

public void update() {
System.out.println("update");
}
}
import org.springframework.aop.MethodBeforeAdvice;

import java.lang.reflect.Method;

public class Log implements MethodBeforeAdvice {
//method：要执行的目标对象的方法
//args：参数
//target：目标对象
public void before(Method method, Object[] args, Object target) throws Throwable {
System.out.println(target.getClass().getName()+method.getName());
}
}
public class AfterLog implements AfterReturningAdvice {

//returnVaule: 返回值
public void afterReturning(Object returnValue, Method method, Object[] args, Object target) throws Throwable {
System.out.println(method.getName()+returnValue);
}
}
public class Mytest {
public static void main(String[] args) {
ApplicationContext context = new ClassPathXmlApplicationContext("ApplcationContext.xml");
//动态代理代理的是接口
UserService userService = (UserService) context.getBean("userservice");
userService.add();
}
}