事务管理器的创建

package com.hope.utils;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.SQLException;

/**
 * @author newcityman
 * @date 2019/11/21 - 20:34
 */
public class ConnectionUtils {
 private ThreadLocal<Connection> t1 = new ThreadLocal<Connection>();

 private DataSource dataSource;

 public void setDataSource(DataSource dataSource) {
 this.dataSource = dataSource;
 }

 /**
 * 获取当前线程的连接
 * @return
 */
 public Connection getThreadConnection() {
 try {
 //1、从当前线程上获取连接
 Connection conn = t1.get();
 //2、判断当前线程上是否有连接
 if (conn == null) {
 //3、从数据源中获取连接，并且存入到线程中
 conn = dataSource.getConnection();
 t1.set(conn);
 }
 //4、返回当前线程上的连接
 return conn;
 } catch (SQLException e) {
 throw new RuntimeException("创建连接失败");
 }
 }

 /**
 * 把线程和连接解绑
 */
 public void removeConnection(){
 t1.remove();
 }

}

package com.hope.utils;

import java.sql.SQLException;

/**
 * @author newcityman
 * @date 2019/11/21 - 20:52
 */
public class TransactionManager {

 private ConnectionUtils connectionUtils;

 public void setConnectionUtils(ConnectionUtils connectionUtils) {
 this.connectionUtils = connectionUtils;
 }

 /**
 * 开启事务
 */
 public void beainTransaction(){
 try {
 connectionUtils.getThreadConnection().setAutoCommit(false);
 } catch (SQLException e) {
 e.printStackTrace();
 }
 }

 /**
 * 提交事务
 */
 public void commit(){
 try {
 connectionUtils.getThreadConnection().commit();
 } catch (SQLException e) {
 e.printStackTrace();
 }
 }

 /**
 * 事务回滚
 */
 public void rollback(){
 try {
 connectionUtils.getThreadConnection().rollback();
 } catch (SQLException e) {
 e.printStackTrace();
 }
 }

 /**
 * 开启事务
 */
 public void release(){
 try {
 connectionUtils.getThreadConnection().close();
 } catch (SQLException e) {
 e.printStackTrace();
 }
 }
}

//bean.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"
 xsi:schemaLocation="http://www.springframework.org/schema/beans
 http://www.springframework.org/schema/beans/spring-beans.xsd">
 <!--配置service-->
 <bean id="accountService" class="com.hope.service.impl.AccountServiceImpl">
 <!--注入dao-->
 <property name="accountDao" ref="accountDao"/>
 <!--注入txManager-->
 <property name="txManager" ref="txManager"/>
 </bean>
 <!--配置dao-->
 <bean id="accountDao" class="com.hope.dao.impl.AccountDaoImpl">
 <!--注入runner-->
 <property name="runner" ref="runner"/>
 <!--注入connectionUtils-->
 <property name="connectionUtils" ref="connctionUtils"/>
 </bean>
 <!--配置QueryRunner-->
 <bean id="runner" class="org.apache.commons.dbutils.QueryRunner" scope="prototype">
 </bean>
 <!-- 配置数据源 -->
 <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
 <!--连接数据库的必备信息-->
 <property name="driverClass" value="com.mysql.jdbc.Driver"/>
 <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/easy"/>
 <property name="user" value="root"/>
 <property name="password" value="123"/>
 </bean>

 <bean name="connctionUtils" class="com.hope.utils.ConnectionUtils">
 <property name="dataSource" ref="dataSource"/>
 </bean>

 <bean name="txManager" class="com.hope.utils.TransactionManager">
 <property name="connectionUtils" ref="connctionUtils"/>
 </bean>
</beans>