19.Spring中使用AOP进行事务的增强(XML）

1.结构图

2.实体类Account：

package com.itheima.domin;

public class Account {
    private Integer id;
    private String name;
    private Float money;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Float getMoney() {
        return money;
    }

    public void setMoney(Float money) {
        this.money = money;
    }

    @Override
    public String toString() {
        return "Account{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", money=" + money +
                '}';
    }
}

3.业务层接口IAccountService：

package com.itheima.service;

import com.itheima.domin.Account;

import java.util.List;

//业务层接口
public interface IAccountService {

    //查询所有
    List<Account> findAccountAll();
    //查询一个
    Account findAccountBuyId(Integer accountId);
    //保存
    void saveAccount(Account account);
    //更新
    void updateAccount(Account account);
    //删除
    void deleteAccount(Integer accountId);
    //转账
    void transfer(String sourceName , String targetName , Float money);
}

4.事务层接口AccountServiceImpl：

package com.itheima.service.ipm;

import com.itheima.dao.IAccountDao;
import com.itheima.domin.Account;
import com.itheima.service.IAccountService;
import com.itheima.utils.TransactionManager;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

public class AccountServiceImpl implements IAccountService {

    private IAccountDao accountDao;

    private TransactionManager txManager;

    public void setAccountDao(IAccountDao accountDao) {
        this.accountDao = accountDao;
    }

    public void setTxManager(TransactionManager txManager) {
        this.txManager = txManager;
    }

    @Override
    public List<Account> findAccountAll() {
        return accountDao.findAccountAll();
    }

    @Override
    public Account findAccountBuyId(Integer accountId) {
        return accountDao.findAccountById(accountId);
    }

    @Override
    public void saveAccount(Account account) {
        accountDao.saveAccount(account);
    }

    @Override
    public void updateAccount(Account account) {
        accountDao.updateAccount(account);
    }

    @Override
    public void deleteAccount(Integer accountId) {
        accountDao.deleteAccount(accountId);
    }

    @Override
    public void transfer(String sourceName, String targetName, Float money) {
        //1.根据名称查询账户
        Account source = accountDao.findAccountByName(sourceName);
        //2.根据名称查询转入账户
        Account  target = accountDao.findAccountByName(targetName);
        //3.转出账户减钱
        source.setMoney(source.getMoney()-money);
        //4.转出账户加钱
        target.setMoney(target.getMoney()+money);
        //int i=1/0;
        //5.更新转出账户
        accountDao.updateAccount(source);
        //6.更新转入账户
        accountDao.updateAccount(target);
    }
}

5.IAccountDao持久层接口

package com.itheima.dao;

import com.itheima.domin.Account;

import java.util.List;

public interface IAccountDao {

    //查询所有
    List<Account> findAccountAll();
    //查询一个
    Account findAccountById(Integer accountId);
    //保存
    void saveAccount(Account account);
    //更新
    void updateAccount(Account account);
    //删除
    void deleteAccount(Integer accountId);
    //转帐
    Account findAccountByName(String accountName);
}

6.持久层实现类AccountDaoImpl：

package com.itheima.dao.ipm;

import com.itheima.dao.IAccountDao;
import com.itheima.domin.Account;
import com.itheima.utils.ConnectionUtils;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;

import java.util.List;

public class AccountDaoImpl implements IAccountDao {
    //让spring容器提供的set方法*
    //使用runner对象
    private QueryRunner runner;
    private ConnectionUtils connectionUtils;

    public void setRunner(QueryRunner runner) {
        this.runner = runner;
    }

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

    @Override
    public List<Account> findAccountAll() {
        try{
            return runner.query(connectionUtils.getThreadConnection(),"select * from account",new BeanListHandler<Account>(Account.class));
        }catch (Exception e){
            throw new RuntimeException(e);
        }
    }

    @Override
    public Account findAccountById(Integer accountId) {
        try{
            return runner.query(connectionUtils.getThreadConnection(),"select * from account where id = ?",new BeanHandler<Account>(Account.class),accountId);
        }catch (Exception e){
            throw new RuntimeException(e);
        }
    }

    @Override
    public void saveAccount(Account account) {
        try{
            runner.update(connectionUtils.getThreadConnection(),"insert into account(name,money)value(?,?)",account.getName(),account.getMoney());
        }catch (Exception e){
            throw new RuntimeException(e);
        }
    }

    @Override
    public void updateAccount(Account account) {
        try{
            runner.update(connectionUtils.getThreadConnection(),"update account set name=?,money=? where id=?",account.getName(),account.getMoney(),account.getId());
        }catch (Exception e){
            throw new RuntimeException(e);
        }
    }

    @Override
    public void deleteAccount(Integer accountId) {
        try{
            runner.update(connectionUtils.getThreadConnection(),"delete from account where id=?",accountId);
        }catch (Exception e){
            throw new RuntimeException(e);
        }
    }

    @Override
    public Account findAccountByName(String accountName) {
        try{
            List<Account> accounts = runner.query(connectionUtils.getThreadConnection(),"select * from account where name = ?",new BeanListHandler<Account>(Account.class),accountName);
            if (accounts == null || accounts.size() == 0){
                return null;
            }
            if (accounts.size()>1){
                throw new RuntimeException("结果集不唯一，数据有问题");
            }
            return accounts.get(0);
        }catch (Exception e){
            throw new RuntimeException(e);
        }
    }
}

7.ConnectionUtils连接：

package com.itheima.utils;


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

public class ConnectionUtils {

    private ThreadLocal<Connection> ts = new ThreadLocal<Connection>();

    private DataSource dataSource;

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

    public Connection getThreadConnection(){
        try {
            //1.先从ThreadLocal上获取
            Connection conn = ts.get();
            //2.判断是否当前线程上有连接
            if (conn == null) {
                //3.从数据源中获取一个连接，并且存入ThreadLocal中（也就是绑定线程）
                conn = dataSource.getConnection();
                /*conn.setAutoCommit(false);*/
            }
            //4.返回当前线程上的连接
            return conn;
        }catch (Exception e){
            throw new RuntimeException(e);
        }
    }
    /*连接之后不用了，就进行线程的解绑，线程还回池中*/
    public void removeConnection(){
        ts.remove();
    }
}

8.事务管理ransactionManager：

package com.itheima.utils;


public class TransactionManager {
    private ConnectionUtils connectionUtils;

    public void setConnectionUtils(ConnectionUtils connectionUtils) {
        this.connectionUtils = connectionUtils;
    }
    //开启事务
    public void beginTransaction(){
        /*之前的事务在这里:开启aop之后就不用自己写事务配置*/
        /*try{
            connectionUtils.getThreadConnection().setAutoCommit(false);
        }catch (Exception e){
            e.printStackTrace();//在命令行打印异常信息在程序中出错的位置及原因
        }*/
    }
    //提交事务
    public void commit(){
       
    }
    //回滚事务
    public void rollback(){
    
    }
    //释放连接事务
    public void release(){
        
    }
}

9.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"
       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/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd">
<!--配置IAccountService的实例对象：入口通常都是这个-->
    <bean id="accountService" class="com.itheima.service.ipm.AccountServiceImpl">
        <!--注入的实例来使用：就要使用property来声明-->
        <property name="accountDao" ref="accountDao"></property>
        <property name="txManager" ref="txManager"></property>
    </bean>
 <!--配置accountDao的实例对象：方便注入 -->
    <bean id="accountDao" class="com.itheima.dao.ipm.AccountDaoImpl">
        <!--注入的实例来使用：就要使用property来声明-->
        <property name="connectionUtils" ref="connectionUtils"></property>
        <property name="runner" ref="runner"></property>
    </bean>
    <bean id="connectionUtils" class="com.itheima.utils.ConnectionUtils">
        <property name="dataSource" ref="dataSource"></property>
    </bean>
    <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">
        <property name="driverClass" value="com.mysql.jdbc.Driver"></property>
        <property name="jdbcUrl" value="jdbc:mysql://127.0.0.1:3306/eesy"></property>
        <property name="user" value="root"></property>
        <property name="password" value="123456"></property>
    </bean>
    <bean id="txManager" class="com.itheima.utils.TransactionManager">
        <property name="connectionUtils" ref="connectionUtils"></property>
    </bean>
    <!--第三天末尾练习:重点-->
    <aop:config>
        <aop:pointcut id="pt1" expression="execution(* com.itheima.service.ipm.*.*(..))"/>
        <aop:aspect id="txAdvice" ref="txManager">
            <aop:before method="beginTransaction" pointcut-ref="pt1"></aop:before>
            <aop:after-returning method="commit" pointcut-ref="pt1"></aop:after-returning>
            <aop:after-throwing method="rollback" pointcut-ref="pt1"></aop:after-throwing>
            <aop:after method="release" pointcut-ref="pt1"></aop:after>
        </aop:aspect>
    </aop:config>
</beans>

10. TestCode

package com.itheima;

import com.itheima.service.IAccountService;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

@RunWith(SpringJUnit4ClassRunner.class)
/*说明位置*/
@ContextConfiguration(locations ="classpath:bean.xml")
/*pom.xml加上spring-test依赖*/
public class TestCode {
    @Autowired
    private IAccountService as;
    @Test
    public void testTransfer(){
        as.transfer("test","zhou",100f);
    }
}

11.pom文件

<!--spring环境-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>5.0.2.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>5.0.2.RELEASE</version>
    </dependency>
<!--sql语句操作-->
    <dependency>
      <groupId>commons-dbutils</groupId>
      <artifactId>commons-dbutils</artifactId>
      <version>1.4</version>
    </dependency>
<!--    mysql配置-->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.6</version>
    </dependency>
<!--    c3p0-->
    <dependency>
      <groupId>c3p0</groupId>
      <artifactId>c3p0</artifactId>
      <version>0.9.1.2</version>
    </dependency>
<!--    junit-->
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
    </dependency>
<!--    aop的-->
    <dependency>
      <groupId>org.aspectj</groupId>
      <artifactId>aspectjweaver</artifactId>
      <version>1.8.7</version>
    </dependency>