使用Spring自动生成代理类,spring利用的是动态代理机制 接口 Java代码 public interface UserDao { void addUser(); void deleteUser(); } 两个实现: Java代码 public class UserDaoMySqlImpl implements UserDao { @Override public void addUser() { System.out.println("UserDaoMySqlImpl.addUser()"); } @Override public void deleteUser() { System.out.println("UserDaoMySqlImpl.deleteUser()"); } } public class UserDaoOracleImpl implements UserDao { @Override public void addUser() { System.out.println("UserDaoOracleImpl.addUser()"); } @Override public void deleteUser() { System.out.println("UserDaoOracleImpl.deleteUser()"); } } Device import java.lang.reflect.Method; import org.springframework.aop.MethodBeforeAdvice; public class UserDaoBeforeAdvice implements MethodBeforeAdvice { @Override public void before(Method arg0, Object[] arg1, Object arg2) throws Throwable { System.out.println("UserDaoBeforeAdvice.before()"); } } spring的配置文件 Xml代码 <!-- 配置实现类的bean,可以把所有的实现类都写上 --> <bean id="userdao" class="com.dowebber.spring.aop.UserDaoMySqlImpl"></bean> <!--配置Advice的bean --> <bean id="beforeadvice" class="com.dowebber.spring.aop.UserDaoBeforeAdvice"></bean> <!--配置spring自动生成代理对象所需要的一些参数 --> <bean id="userdaoproxy" class="org.springframework.aop.framework.ProxyFactoryBean"> <property name="proxyInterfaces" value="com.dowebber.spring.aop.UserDao"/> <property name="target"> <ref bean="userdao"/> </property> <property name="interceptorNames"> <list> <value>beforeadvice</value> </list> </property> </bean> 测试类: Java代码 import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class TestUserDaoBeforeDevice { public static void main(String[] args) { ApplicationContext context = new ClassPathXmlApplicationContext("com/dowebber/spring/aop/spring.xml"); UserDao dao = (UserDao)context.getBean("userdaoproxy"); dao.addUser(); } }
