Spring_day04_实例1：基于XML的声明式事务控制

项目组织结构如下：

一、pom依赖：

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.zl</groupId>
    <artifactId>spring_day04_transaction_xml</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>

    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.0.2.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.6</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.0.2.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>5.0.2.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>

        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.8.13</version>
        </dependency>
    </dependencies>
</project>

二、实体类Account:

package com.zl.domain;

import java.io.Serializable;

public class Account implements Serializable {
    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 +
                '}';
    }
}

三、Service层：

com.zl.service.AccountService接口:

package com.zl.service;

public interface AccountService {

    /**
     * 转账
     * @param sourceName    转出账户名称
     * @param targetName    转入账户名称
     * @param money         转账金额
     */
    void transfer(String sourceName,String targetName,Float money);
}

com.zl.service.AccountServiceImpl实现类：

package com.zl.service.impl;

import com.zl.dao.AccountDao;
import com.zl.domain.Account;
import com.zl.service.AccountService;

public class AccountServiceImpl implements AccountService {

    private AccountDao accountDao;

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

    public void transfer(String sourceName, String targetName, Float money) {
        //1.根据名称查询两个账户名称
        Account source = accountDao.findAccountByName(sourceName);
        Account target = accountDao.findAccountByName(targetName);
        //修改两个账户的金额
        source.setMoney(source.getMoney()-money);
        target.setMoney(target.getMoney()+money);
        //3.更新两个账户
        accountDao.updateAccount(source);
        int i = 1/0;
        accountDao.updateAccount(target);
    }
}

四、Dao层：

`com.zl.Dao接口：

package com.zl.dao;

import com.zl.domain.Account;

public interface AccountDao {

    /**
     * 根据账户名称查询账户
     * @param name
     * @return
     */
    Account findAccountByName(String name);

    /**
     * 更新账户
     * @param account
     */
    void updateAccount(Account account);
}

com.zl.dao.impl.AccountDaoImpl实现类：

package com.zl.dao.impl;

import com.zl.dao.AccountDao;
import com.zl.domain.Account;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;

import java.util.List;

public class AccountDaoImpl implements AccountDao {

    private JdbcTemplate jt;

    public void setJt(JdbcTemplate jt) {
        this.jt = jt;
    }

    public Account findAccountByName(String name) {
        List<Account> accounts = jt.query("select * from account where name=?", new BeanPropertyRowMapper<Account>(Account.class), name);
        if(accounts.isEmpty()){
            return null;
        }else if(accounts.size()>1){
            throw new RuntimeException("根据名称查询得到的结果不唯一...");
        }
        return accounts.get(0);
    }

    public void updateAccount(Account account) {
        jt.update("update account set money=? where id=?",account.getMoney(),account.getId());
    }
}

四、AOP主配置文件：

resources.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"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd">

    <!-- 配置业务层-->
    <bean id="accountService" class="com.zl.service.impl.AccountServiceImpl">
        <property name="accountDao" ref="accountDao"></property>
    </bean>

    <!-- 配置账户的持久层-->
    <bean id="accountDao" class="com.zl.dao.impl.AccountDaoImpl">
        <property name="jt" ref="jdbcTemplate"></property>
    </bean>

    <!--配置jdbcTemplate模板-->
    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!-- 配置数据源-->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
        <property name="url" value="jdbc:mysql://localhost:3306/spring"></property>
        <property name="username" value="root"></property>
        <property name="password" value="root"></property>
    </bean>

    <!-- 配置事务管理器 -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!-- 配置事务的通知-->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <tx:attributes>
            <tx:method name="find*" read-only="true" propagation="SUPPORTS" />
        </tx:attributes>
    </tx:advice>

    <!-- 配置aop-->
    <aop:config>
        <aop:pointcut id="pt1" expression="execution(* com.zl.service.impl.*.*(..))"/>
        <aop:advisor advice-ref="txAdvice" pointcut-ref="pt1"/>
    </aop:config>

</beans>

需要注意的是：当我们使用环绕通知时，其他四个通知无法使用，否则反之。

五、测试类：

import com.zl.service.AccountService;
import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class TestTx {
    private ApplicationContext app;
    private AccountService accountService;
    @Before
    public void init(){
        app = new ClassPathXmlApplicationContext("bean.xml");
        accountService = app.getBean("accountService", AccountService.class);
    }


    @Test
    public void testTransfer(){
        accountService.transfer("aaa","bbb",100f);
    }
}