Spring自动代理-BeanNameAutoProxyCreator

最新推荐文章于 2019-08-27 22:32:24 发布

原创最新推荐文章于 2019-08-27 22:32:24 发布 · 176 阅读

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#Spring #AOP #DAO #Bean #XML

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本文介绍了一个使用Spring AOP实现的简单示例，通过自定义拦截器实现了对DAO和服务层方法调用前后的操作增强。

1，定义Around处理

package cn.hunnu.aop.autoproxy;

import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;
/**
 * Around 处理
 * @author 肖波
 *
 */
public class ServiceDAOInterceptor implements MethodInterceptor
{

	@Override
	public Object invoke(MethodInvocation invocation) throws Throwable
	{
		String methodName = invocation.getMethod().getName();
		System.out.println("before execute method:"+methodName);
		Object result = invocation.proceed();
		System.out.println("after executed method:"+methodName);
		return result;
	}

}

2，DAO、Service

package cn.hunnu.aop.autoproxy;

public interface ITestDAO
{
	public void query();
}

package cn.hunnu.aop.autoproxy;

public interface ITestService
{
	public void service();
}

package cn.hunnu.aop.autoproxy;

public class TestDAO implements ITestDAO
{

	@Override
	public void query()
	{
		System.out.println("query(): query data from database...");
	}

}

package cn.hunnu.aop.autoproxy;

public class TestService implements ITestService
{
	private ITestDAO dao;
	@Override
	public void service()
	{
		System.out.println("service(): call service to execute business logic...");
		dao.query();
	}
	public ITestDAO getDao()
	{
		return dao;
	}
	public void setDao(ITestDAO dao)
	{
		this.dao = dao;
	}
	
}

3，上下文配置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:context="http://www.springframework.org/schema/context"  
    xmlns:aop="http://www.springframework.org/schema/aop"  
    xsi:schemaLocation="http://www.springframework.org/schema/beans   
           http://www.springframework.org/schema/beans/spring-beans-2.5.xsd   
           http://www.springframework.org/schema/context   
           http://www.springframework.org/schema/context/spring-context-2.5.xsd   
           http://www.springframework.org/schema/aop 
           http://www.springframework.org/schema/aop/spring-aop-2.5.xsd">
    <!-- BeanPostProcessor -->
	<bean class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator">
		<!-- generate proxy dynamically for these beans which match the follow beanNames -->
		<property name="beanNames">
			<!-- target bean will be wrapped  -->
			<value>*DAO,*Service</value>
		</property>
		<property name="interceptorNames">
			<value>ServiceDAOInterceptor</value>
		</property>
	</bean>
	
	<bean id="ServiceDAOInterceptor"
		class="cn.hunnu.aop.autoproxy.ServiceDAOInterceptor">
	</bean>
	
	<bean id="TestDAO" class="cn.hunnu.aop.autoproxy.TestDAO"></bean>
	<bean id="TestService" class="cn.hunnu.aop.autoproxy.TestService">
		<property name="dao">
			<ref local="TestDAO"/>
		</property>
	</bean>
</beans>

4，测试类

package cn.hunnu.aop.autoproxy;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Main
{
	public static void main(String args[])
	{
		//ApplicationContext ctx = new FileSystemXmlApplicationContext("src/applicationContext.xml");
		ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
		ITestDAO dao = (ITestDAO)ctx.getBean("TestDAO");
		ITestService service = (ITestService)ctx.getBean("TestService");
		
		dao.query();
		
		service.service();
	}
}

5，运行结果

before execute method:query
query(): query data from database...
after executed method:query
before execute method:service
service(): call service to execute business logic...
before execute method:query
query(): query data from database...
after executed method:query
after executed method:service