使用Spring自動生成代理類,spring利用的是動態代理機制?
接口?

Java代碼?
public interface UserDao {?
void addUser();?
void deleteUser();?
}?
兩個實現:?

Java代碼?
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代碼?
<!-- 配置實現類的bean,可以把所有的實現類都寫上 -->??
<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自動生成代理對象所需要的一些參數 -->??
<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>??


測試類:?

Java代碼?
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();???
}???
??
}?

轉載于:https://www.cnblogs.com/toSeeMyDream/p/4378970.html

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