Spring笔记

 <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.0.2.RELEASE</version>
        </dependency>

<?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:aop="http://www.springframework.org/schema/aop"
       xmlns:context="http://www.springframework.org/schema/context"
       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 http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

 <!---配置service -->
 <bean id="accountService" class="com.itheima.service.impl.AccountServiceImpl"> </bean>
 <!-- 配置dao -->
 <bean id="accountDao" class="com.itheima.dao.impl.AccountDaoImpl"></bean>

public static void main(String[] args) { 
    //1.使用ApplicationContext接口，就是在获取spring容器 
　　 ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml"); 
    //2.根据bean的id获取对象 IAccountService aService = (IAccountService) ac.getBean("accountService");  
    System.out.println(aService); 
　　 IAccountDao aDao = (IAccountDao) ac.getBean("accountDao");     
    System.out.println(aDao);
 }

public class BeanFactory {

    final TransactionManager txManager = new TransactionManager();


    public static IAccountService getAccountService() throws IllegalAccessException, InstantiationException {
        //1.定义被代理对象
        final IAccountService accountService = new AccountServiceImpl();
        //2.创建代理对象
        IAccountService proxyAccountService = (IAccountService) Proxy.newProxyInstance(accountService.getClass().getClassLoader(),
                accountService.getClass().getInterfaces(),new InvocationHandler() {

                    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
                        Object rtValue = null;
                        try {
                            //开启事务
                            TransactionManager.beginTransaction();
                            //执行业务层方法
                            rtValue = method.invoke(accountService, args);
                            //提交事务
                            TransactionManager.commit();
                        }catch(Exception e) {
                            //回滚事务 TransactionManager.rollback();
                            e.printStackTrace();
                        }finally {
                            //释放资源
                            TransactionManager.release();
                        }
                        return rtValue;
                    }
        });
        return proxyAccountService;
    }
}