AOP优化转账案例
TransactionManager：切面类
1.xml配置实现
1.1 配置文件
<?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.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
">
<!-- 开启注解扫描-->
<context:component-scan base-package="com.lagou"></context:component-scan>
<!-- 加载jdbc配置文件 -->
<context:property-placeholder location="classpath:jdbc.properties" ></context:property-placeholder>
<!-- 配置数据源-->
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
<property name="driverClassName" value="${jdbc.driverClassName}" />
<property name="url" value="${jdbc.url}" />
<property name="username" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
</bean>
<!--配置QueryRunner,它是jar包封装好的，实例化时需要传入数据源作为参数-->
<bean id="queryRunner" class="org.apache.commons.dbutils.QueryRunner">
<constructor-arg name="ds" ref="dataSource"></constructor-arg>
</bean>
<!-- AOP配置-->
<aop:config>
<!-- 切点表达式-->
<aop:pointcut id="myPointcut" expression="execution(* com.lagou.service.Impl.AccountServiceImpl.*(..))"/>
<!-- 配置切面-->
<aop:aspect ref="transactionManager">
<aop:before method="beginTransacation" pointcut-ref="myPointcut" />
<aop:after-returning method="conmmit" pointcut-ref="myPointcut" />
<aop:after-throwing method="rollback" pointcut-ref="myPointcut" />
<aop:after method="release" pointcut-ref="myPointcut" />
</aop:aspect>
</aop:config>
</beans>
1.2 事务管理器（通知）
package com.lagou.util;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import java.sql.SQLException;
/**
* 事务管理器工具类，包含：开启事务、提交事务、回滚事务、释放资源
*/
@Component
public class TransactionManager {
@Autowired
private ConnectionUtils connectionUtils;
// 设置事务为手动提交
public void beginTransacation(){
try {
connectionUtils.getThreadConnection().setAutoCommit(false);
} catch (SQLException e) {
e.printStackTrace();
}
}
// 提交事务
public void conmmit(){
try {
connectionUtils.getThreadConnection().commit();
} catch (SQLException e) {
e.printStackTrace();
}
}
// 回滚事务
public void rollback(){
try {
connectionUtils.getThreadConnection().rollback();
} catch (SQLException e) {
e.printStackTrace();
}
}
// 释放资源
public void release(){
try {
connectionUtils.getThreadConnection().setAutoCommit(true);//设置会自动提交事务
connectionUtils.getThreadConnection().close();//关闭连接
connectionUtils.removeThredConnection();//接触线程绑定
} catch (SQLException e) {
e.printStackTrace();
}
}
}
1.3切入点
@Override
public void transfer(String name1, String name2,Double money) {
// 2.业务操作
//一个账号转出资金
accountDao.out(name1,money);
int num = 100;
num = num / 0;
//另一个账号资金就增加
accountDao.in(name2 ,money );
}
2.基于注解实现
2.1配置文件
<?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">
<!--开启组件扫描-->
<context:component-scan base-package="com.lagou"/>
<!--开启AOP注解支持-->
<aop:aspectj-autoproxy/>
<!--加载jdbc配置文件-->
<context:property-placeholder location="classpath:jdbc.properties"/>
<!--把数据库连接池交给IOC容器-->
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
<property name="driverClassName" value="${jdbc.driver}"></property>
<property name="url" value="${jdbc.url}"></property>
<property name="username" value="${jdbc.username}"></property>
<property name="password" value="${jdbc.password}"></property>
</bean>
<!--把QueryRunner交给IOC容器-->
<bean id="queryRunner" class="org.apache.commons.dbutils.QueryRunner">
<constructor-arg name="ds" ref="dataSource"></constructor-arg>
</bean>
</beans>
2.2事务管理器（通知）
@Component
@Aspect
public class TransactionManager {
@Autowired
ConnectionUtils connectionUtils;
@Around("execution(* com.lagou.serivce..*.*(..))")
public Object around(ProceedingJoinPoint pjp) {
Object object = null;
try {
// 开启事务
connectionUtils.getThreadConnection().setAutoCommit(false);
// 业务逻辑
pjp.proceed();
// 提交事务
connectionUtils.getThreadConnection().commit();
} catch (Throwable throwable) {
throwable.printStackTrace();
// 回滚事务
try {
connectionUtils.getThreadConnection().rollback();
} catch (SQLException e) {
e.printStackTrace();
}
} finally {
try {
connectionUtils.getThreadConnection().setAutoCommit(true);
connectionUtils.getThreadConnection().close();
connectionUtils.removeThreadConnection();
} catch (SQLException e) {
e.printStackTrace();
}
}
return object;
}
}
💖💖💖 完结撒花
💖💖💖 路漫漫其修远兮，吾将上下而求索
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