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  • AOP 手动,半自动,全自动

    dao层

    package com.yaorange.dao;

    public interface StudentDao {

    public void saveStudent();

    public void deleteStudent();
    }

    dao层的实现

    package com.yaorange.dao.impl;

    import com.yaorange.dao.StudentDao;

    public class StudentDaoImpl implements StudentDao{

    @Override
    public void saveStudent() {
    System.out.println("saveStudent");
    }

    @Override
    public void deleteStudent() {
    System.out.println("deleteStudent");
    }

    }

    工具层

    第一个是工厂制造studentDao

    package com.yaorange.utils;

    import java.lang.reflect.InvocationHandler;
    import java.lang.reflect.Method;
    import java.lang.reflect.Proxy;

    import com.yaorange.dao.StudentDao;
    import com.yaorange.dao.impl.StudentDaoImpl;

    public class MyFactory {

    public static StudentDao createStudentProxy(){
    final StudentDao studentDaoImpl = new StudentDaoImpl();
    final StudentAspect studentAspect = new StudentAspect();

    StudentDao studentDao = (StudentDao) Proxy.newProxyInstance(MyFactory.class.getClassLoader(),
    studentDaoImpl.getClass().getInterfaces(),
    new InvocationHandler() {

    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
    studentAspect.before();
    Object object = method.invoke(studentDaoImpl, args);
    studentAspect.after();
    return object;
    }
    });
    return studentDao;
    }
    }

    StudentAspect是学生的一个aspect

    package com.yaorange.utils;

    import org.aopalliance.intercept.MethodInterceptor;
    import org.aopalliance.intercept.MethodInvocation;

    public class StudentAspect implements MethodInterceptor{
    //开始事务
    public void before(){
    System.out.println("开始事务");
    }

    //提交事务
    public void after(){
    System.out.println("提交事务");
    }

    @Override
    public Object invoke(MethodInvocation mi) throws Throwable {
    before();
    Object object = mi.proceed();
    after();
    return object;
    }
    }

    手动的是不写beans.xml的

    <?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/aop
    http://www.springframework.org/schema/aop/spring-aop.xsd
    ">
    <!--*****************************半自动 **************************** -->
    <!--创建目标类 -->
    <bean id="studentDaoImpl" class="com.yaorange.dao.impl.StudentDaoImpl"/>

    <!--创建切面类 -->
    <bean id="studentAspect" class="com.yaorange.utils.StudentAspect"/>

    <!-- 3 创建代理类
    * 使用工厂bean FactoryBean ,底层调用 getObject() 返回特殊bean
    * ProxyFactoryBean 用于创建代理工厂bean,生成特殊代理对象
    interfaces : 确定接口们
    通过<array>可以设置多个值
    只有一个值时,value=""
    target : 确定目标类
    interceptorNames : 通知 切面类的名称,类型String[],如果设置一个值 value=""
    optimize :强制使用cglib
    <property name="optimize" value="true"></property>
    底层机制
    如果目标类有接口,采用jdk动态代理
    如果没有接口,采用cglib 字节码增强
    如果声明 optimize = true ,无论是否有接口,都采用cglib

    -->


    <!--代理类 -->
    <bean id="proxyStudentDao" class="org.springframework.aop.framework.ProxyFactoryBean">
    <property name="optimize" value="true"/>
    <property name="interfaces" value="com.yaorange.dao.StudentDao"/>
    <property name="target" ref="studentDaoImpl"/>
    <property name="interceptorNames" value="studentAspect"></property>

    </bean>



    <!-- **********************全自动 ************************-->
    <!-- 目标类 -->
    <bean id="studentDaoImpl2" class="com.yaorange.dao.impl.StudentDaoImpl"/>

    <!-- *******************切面类************************* -->
    <bean id="studentAspect2" class="com.yaorange.utils.StudentAspect"/>
    <aop:config>

    <!-- *代表匹配   任意包    包里面任意的类   类中任意的方法      .代表方法中的参数 -->

    <aop:pointcut expression="excution(* com.yaorange.utils.*.*(..))" id="mypointcut"/>
    <aop:advisor advice-ref="studentAspect2" pointcut-ref="mypointcut"/>
    </aop:config>
    </beans>

     最后是我们的测试类

    package com.yaorange.test;

    import org.junit.Test;
    import org.springframework.context.support.ClassPathXmlApplicationContext;

    import com.yaorange.dao.StudentDao;
    import com.yaorange.utils.MyFactory;

    public class AOPTest {

    //手动
    @Test
    public void test1(){
    StudentDao studentDao = MyFactory.createStudentProxy();
    studentDao.saveStudent();
    }
    //半自动
    @Test
    public void test2(){
    ClassPathXmlApplicationContext cpx = new ClassPathXmlApplicationContext("beans.xml");
    StudentDao studentDao = (StudentDao) cpx.getBean("proxyStudentDao");
    studentDao.saveStudent();
    studentDao.deleteStudent();
    }
    //全自动
    @Test
    public void test3(){
    StudentDao studentDao = MyFactory.createStudentProxy();
    studentDao.saveStudent();
    }
    }

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  • 原文地址:https://www.cnblogs.com/handbang/p/5994741.html
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