基于代理类ProxyFactoryBean的AOP实现---前置通知编码实现

淩亂°似流年 2022-07-12 04:53 285阅读 0赞

代码：

1.配置文件

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:p="http://www.springframework.org/schema/p"
    	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">
    	
    	<bean id="userDAO" class="com.springtest1.dao.UserDAOImpl">	 
    	</bean>
    	
    	<bean id="userBiz" class="com.springtest1.biz.UserBizImpl">
    	  
    	  <property name="userDAO" ref="userDAO" />
    	</bean>	
    		
    	
    	<bean id="logAdvice" class="com.springtest1.aop.LogAdvice"></bean>
    
    	
    	<bean id="ub" class="org.springframework.aop.framework.ProxyFactoryBean">
    	  <property name="proxyInterfaces">
    	    <value>com.springtest1.biz.UserBiz</value>
    	  </property>
    	  <property name="interceptorNames">
    	    <list>	     
    	     <value>logAdvice</value>	  
    	    </list>
    	  </property>
    	  <property name="target" ref="userBiz"></property>
    	</bean>
    </beans>

2.编写业务逻辑层

UserBiz.java

package com.springtest1.biz;
    
    public interface UserBiz {
       //添加用户
    	public void addUser(String username,String password);
    	//删除用户
    	public void delUser(int id);
    }

UserBizImpl.java

package com.springtest1.biz;
    
    import com.springtest1.dao.UserDAO;
    import com.springtest1.dao.UserDAOImpl;
    public class UserBizImpl implements UserBiz {
    	//使用UserDAO接口声明了一个对象
    	//并为其添加set方法，用于依赖注入
    	UserDAO userDAO;
    	public void setUserDAO(UserDAO userDAO){
    		this.userDAO=userDAO;
    	}
    
    	@Override
    	public void addUser(String username, String password) {
    		// TODO Auto-generated method stub
           userDAO.addUser( username, password);
    	}
    
    	@Override
    	public void delUser(int id) {
    		// TODO Auto-generated method stub
           userDAO.delUser(id);
           throw new RuntimeException("这是特意抛出的异常信息！");
    	}
    
    }

3.编写数据访问层

UserDAO.java

package com.springtest1.dao;
    
    public interface UserDAO {
       //添加用户
    	public void addUser(String username,String password);
    	//删除用户
    	public void delUser(int id);
    }

UserDAOImpl.java

package com.springtest1.dao;
    
    public class UserDAOImpl implements UserDAO {
    
    	@Override
    	public void addUser(String username, String password) {
    		// TODO Auto-generated method stub
           System.out.println(username+"用户添加成功");
    	}
    
    	@Override
    	public void delUser(int id) {
    		// TODO Auto-generated method stub
           System.out.println("编号为"+id+"的用户被删除");
    	}
    
    }

4.编写AOP切面编程

LogAdvice.java

package com.springtest1.aop;
    
    import java.lang.reflect.Method;
    import org.springframework.aop.MethodBeforeAdvice;
    import org.apache.log4j.Logger;
    
    public class LogAdvice implements MethodBeforeAdvice {
    
    	private Logger logger=Logger.getLogger(LogAdvice.class);
    	public void before(Method method, Object[] args, Object target) throws Throwable {
    		//获取被调用的类名
    		String targetClassName=target.getClass().getName();
    		//获取被调用的方法名
    		String targetMethodName=method.getName();
    		//日志格式字符串
    		String logInfoText="前置通知："+targetClassName+"类的"+targetMethodName+"方法开始执行";
    		//将日志信息写入配置的文件中
    		logger.info(logInfoText);
    	}
    }

5.测试类

AOPTest.java

package com.springtest1;
    
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    
    import com.springtest1.biz.UserBiz;
    
    public class AOPTest {
    	public static void main(String[] args) {
    		// TODO Auto-generated method stub
    		//加载applicationContext.xml配置
    		ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");
    		//获取配置中的UserBizImpl实例
    		UserBiz userBiz =(UserBiz)context.getBean("ub");	
    		userBiz.addUser("zhangsan","123");
    		userBiz.delUser(1);
    	}
    
    }

6.截图

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[Center]: /images/20220711/0bf9b6c6e50c494db604d5330e0d650d.png