spring aop2

最新推荐文章于 2025-08-12 14:50:49 发布

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本文介绍了一个使用Spring框架实现面向切面编程(AOP)的具体案例。通过配置文件定义了切面，实现了对特定方法调用前的安全检查。示例中包含了安全管理器、用户管理接口及其实现，并展示了如何在不修改业务代码的情况下增加横切关注点。

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spring对AOP的只是（采用配置文件的方式）

1、spring依赖库
* SPRING_HOME/dist/spring.jar
* SPRING_HOME/lib/jakarta-commons/commons-logging.jar
* SPRING_HOME/lib/log4j/log4j-1.2.14.jar
* SPRING_HOME/lib/aspectj/*.jar
2、配置如下
<aop:config>
<aop:aspect id="security" ref="securityHandler">
<aop:pointcut id="allAddMethod" expression="execution(* com.bjsxt.spring.UserManagerImpl.add*(..))"/>
<aop:before method="checkSecurity" pointcut-ref="allAddMethod"/>
</aop:aspect>
</aop:config>

import org.springframework.beans.factory.BeanFactory;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Client {

public static void main(String[] args) {
BeanFactory factory = new ClassPathXmlApplicationContext("applicationContext.xml");

UserManager userManager = (UserManager)factory.getBean("userManager");

userManager.addUser("张三", "123");
userManager.deleteUser(1);
}
}

public class SecurityHandler {

private void checkSecurity() {
System.out.println("----------checkSecurity()---------------");
}

}

public interface UserManager {

public void addUser(String username, String password);

public void deleteUser(int id);

public void modifyUser(int id, String username, String password);

public String findUserById(int id);
}

public class UserManagerImpl implements UserManager {

public void addUser(String username, String password) {
System.out.println("-------UserManagerImpl.addUser()----------");
}

public void deleteUser(int id) {
System.out.println("-------UserManagerImpl.deleteUser()----------");
}

public String findUserById(int id) {
System.out.println("-------UserManagerImpl.findUserById()----------");
return null;
}

public void modifyUser(int id, String username, String password) {
System.out.println("-------UserManagerImpl.modifyUser()----------");
}

// private void checkSecurity() {
// System.out.println("----------checkSecurity()---------------");
// }
}

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"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd">

<bean id="securityHandler" class="com.bjsxt.spring.SecurityHandler"/>

<bean id="userManager" class="com.bjsxt.spring.UserManagerImpl"/>

<aop:config>
<aop:aspect id="security" ref="securityHandler">
<aop:pointcut id="allAddMethod" expression="execution(* com.bjsxt.spring.UserManagerImpl.add*(..))"/>
<aop:before method="checkSecurity" pointcut-ref="allAddMethod"/>
</aop:aspect>
</aop:config>
</beans>