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>