5、使用spring實現aop
第一種方式—通過springAPI來實現aop
Log.java--前置通知
package cn.sxt.log;
import java.lang.reflect.Method;
import org.springframework.aop.MethodBeforeAdvice;
public class Log implements MethodBeforeAdvice{
/*
* @param method 被調用方法對象
* @param args 被調用的方法的參數
* @param target 被調用方法的目標對象
*/
@Override
public void before(Method method, Object[] args, Object target)
throws Throwable {
System.out.println(target.getClass().getName()+"的"+method.getName()+"方法被執行");
}
}
AfterLog.java
package cn.sxt.log;
import java.lang.reflect.Method;
import org.springframework.aop.AfterReturningAdvice;
public class AfterLog implements AfterReturningAdvice{
/*目標方法執行的通知
* returnValue--返回值
* method 被調用的方法對象
* args 被調用的方法對象的目標對象
* target 被調用的方法對象的目標對象
*/
@Override
public void afterReturning(Object returnValue, Method method, Object[] args, Object target)
throws Throwable {
// TODO 自動生成的方法存根
System.out.println(target.getClass().getName()+"的"+method.getName()+"被執行,返回值是:"+returnValue);
}
}
目標類UserServiceImpl.java
package cn.sxt.service;
public class UserServiceImpl implements UserService{
public void add(int a) {
System.out.println("增加用戶");
}
public void update() {
System.out.println("修改用戶");
}
public void delete() {
System.out.println("刪除用戶");
}
public void search() {
System.out.println("查詢用戶");
}
}
spring的配置文件
<?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="cn.sxt.service.impl.UserServiceImpl"></bean>
<bean id="log" class="cn.sxt.log.Log"/>
<bean id="afterLog" class="cn.sxt.log.AfterLog"/>
<aop:config>
<aop:pointcut expression="execution(* cn.sxt.service.impl.*.*(..))" id="pointcut"/>
<aop:advisor advice-ref="log" pointcut-ref="pointcut"/>
<aop:advisor advice-ref="afterLog" pointcut-ref="pointcut"/>
</aop:config>
</beans>
Test.java
package cn.sxt.test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import cn.sxt.service.UserService;
public class Test {
public static void main(String[] args) {
ApplicationContext ac=new ClassPathXmlApplicationContext("beans.xml");
UserService userService =(UserService)ac.getBean("userService");
userService.add(2);
}
}
UserService.java
package cn.sxt.service;
public interface UserService {
public void add(int a);
public void update();
public void delete();
public void search();
}