在Spring框架中，通過自定義的資料庫事物攔截器，對所有的Service層的Bean中的*Save和*Bc方法進行事務控制。
主要涉及的技術有：
1. Spring AOP
2. annotation
3. component-scan
4. MethodInterceptor
5. NameMatchMethodPointcutAdvisor
6. BeanNameAutoProxyCreator

1.程式目錄

project
    \---src
        \---main
            \---java
            |   \--
 
-pers
            |       \---hanchao
            |           \---aop
            |               \---App.java
            |               \---AopController.java
            |               \---AopService.java
            |               \---AopRepository.java
            |               \---MyDbInterceptor
 
.java
            \---resources
                \---spring-config
                    \---spring-aop.xml

2.App.java

package pers.hanchao.aop;

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

/**
 * <p>在Spring框架中，通過自定義的資料庫事物攔截器，對所有的Service層的Bean中的*Save和*Bc方法進行事務控制。</p>
 * @author
 
 hanchao 2018/1/8 23:22
 **/
public class App {
    public static void main(String[] args) throws InterruptedException {
        ApplicationContext context = new ClassPathXmlApplicationContext("spring-config/spring-aop.xml");
        AopController aopController = (AopController) context.getBean("aopController");
        //模擬資料庫查詢，不涉及事務控制
        aopController.showMessage();
        Thread.sleep(2000);//為了更好的列印控制檯資訊
        //模擬資料庫執行成功的情況
        System.out.println("============================");
        aopController.doSqlSuccess();
        Thread.sleep(2000);
        //模擬資料庫執行中報錯的情況
        System.out.println("============================");
        aopController.doSqlFailed();
    }
}

3.AopController.java

package pers.hanchao.aop;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;

@Controller
public class AopController {
    @Autowired
    private AopService aopService;

    public void showMessage(){
        this.aopService.showMessage();
    }

    public void doSqlSuccess(){
        this.aopService.goodSave();
    }

    public void doSqlFailed() throws InterruptedException {
        this.aopService.badBc();
    }
}

4.AopService.java

package pers.hanchao.aop;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class AopService {
    @Autowired
    private AopRepository aopRepository;

    public void showMessage() {
        this.aopRepository.showMessage();
    }

    public void goodSave(){
        this.aopRepository.doSqlSuccess();
    }

    public void badBc() throws InterruptedException {
        this.aopRepository.doSqlFailed();
    }
}

5.AopRepository.java

package pers.hanchao.aop;

import org.springframework.stereotype.Repository;

@Repository
public class AopRepository {
    public void showMessage() {
        System.out.println("No transaction!");
    }

    public void doSqlSuccess() {
        System.out.println("Execute Sql success!");
    }

    public void doSqlFailed() throws InterruptedException {
        System.out.println("Execute Sql failed!");
        Thread.sleep(2000);
        throw new NullPointerException();
    }
}

6.MyDbInterceptor.java

package pers.hanchao.aop;

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

/**
 * <p>自定義資料庫事物攔截器(模擬)</p>
 * @author hanchao 2018/1/8 23:22
 **/
public class MyDbInterceptor implements MethodInterceptor{

    @Override
    public Object invoke(MethodInvocation methodInvocation) throws Throwable {
        String beanName = methodInvocation.getThis().toString();
        String method = methodInvocation.getMethod().getName();
        System.out.println("[beanName:" + beanName + ",method:" + method + "]");
        System.out.println("Transaction begin：conn.setAutoCommit(false);");
        try{
            Object result = methodInvocation.proceed();
            System.out.println("Transaction commit：conn.commit();");
            return result;
        }catch (Exception e){
            System.out.println("Transaction rollback：conn.rollback();");
            e.printStackTrace();
            return null;
        }finally {
            System.out.println("Db connection closed：ps1.close();conn.close();");
        }
    }
}

7.spring-aop.xml.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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
    <!--開啟註解-->
    <context:annotation-config/>
    <!--開啟@Component等註解的自動掃描-->
    <context:component-scan base-package="pers.hanchao.*"/>

    <!--自定義的db攔截器-->
    <bean id="myDbInterceptor" class="pers.hanchao.aop.MyDbInterceptor"/>

    <!--定義通過方法名稱匹配的切入點指示器-->
    <bean id="dbAdvisor" class="org.springframework.aop.support.NameMatchMethodPointcutAdvisor">
        <!--對映一種BeanName-->
        <!--<property name="mappedName" value="aopSave"/>-->
        <!--對映多種BeanNames-->
        <property name="mappedNames">
            <list>
                <value>*Save</value>
                <value>*Bc</value>
            </list>
        </property>
        <property name="advice" ref="myDbInterceptor"/>
    </bean>

    <!--定義通過Bean名稱生成自動代理的創造器-->
    <bean class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator">
        <property name="beanNames" value="*Service"/>
        <property name="interceptorNames" value="dbAdvisor"/>
    </bean>
</beans>

8.result

No transaction!
============================
[beanName:pers.hanchao.aop.AopService@6d763516,method:goodSave]
Transaction begin：conn.setAutoCommit(false);
Execute Sql success!
Transaction commit：conn.commit();
Db connection closed：ps1.close();conn.close();
============================
[beanName:pers.hanchao.aop.AopService@6d763516,method:badBc]
Transaction begin：conn.setAutoCommit(false);
Execute Sql failed!
java.lang.NullPointerException
Transaction rollback：conn.rollback();
    at pers.hanchao.aop.AopRepository.doSqlFailed(AopRepository.java:18)
Db connection closed：ps1.close();conn.close();
    at pers.hanchao.aop.AopService.badBc(AopService.java:20)
    at pers.hanchao.aop.AopService$$FastClassBySpringCGLIB$$cc53b31d.invoke(<generated>)
    at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:747)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
    at pers.hanchao.aop.MyDbInterceptor.invoke(MyDbInterceptor.java:19)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
    at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:689)
    at pers.hanchao.aop.AopService$$EnhancerBySpringCGLIB$$b0199d73.badBc(<generated>)
    at pers.hanchao.aop.AopController.doSqlFailed(AopController.java:20)
    at pers.hanchao.aop.App.main(App.java:23)