Spring框架(十四)：纯注解的spring的声明式事务控制

1、创建maven项目并导入jar包的坐标

2、在domain包下创建账户实体类Account

package com.wedu.spring15.domain;

import java.io.Serializable;

/**
 * 账户实体
 */
public class Account implements Serializable{

    private Integer id;
    private Integer uid;
    private Double money;

    public Integer getId() {
        return id;
    }

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

    public Integer getUid() {
        return uid;
    }

    public void setUid(Integer uid) {
        this.uid = uid;
    }

    public Double getMoney() {
        return money;
    }

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

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

3、在dao包下创建持久层接口IAccountDao并添加方法

package com.wedu.spring15.dao;

import com.wedu.spring15.domain.Account;

import java.util.List;

/**
 * 账户持久层接口
 */
public interface IAccountDao {

    /**
     * 查询所有账户
     * @return
     */
    List<Account> findAllAccount();


    /**
     * 修改账户
     * @param account
     */
    void updateAccount(Account account);

    /**
     * 根据id查询账户
     * @param id
     * @return
     */
    Account findAccountById(Integer id);
}

4、在dao包下创建持久层接口的实现类AccountDaoImpl并实现方法

package com.wedu.spring15.dao.impl;

import com.wedu.spring15.dao.IAccountDao;
import com.wedu.spring15.domain.Account;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Repository;

import java.util.List;

/**
 * 账户持久层接口实现
 */
@Repository("accountDao")
public class AccountDaoImpl implements IAccountDao {

    @Autowired
    private JdbcTemplate jdbcTemplate;

    @Override
    public List<Account> findAllAccount() {
        return jdbcTemplate.query("select * from account",new BeanPropertyRowMapper<Account>(Account.class));
    }

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

    @Override
    public Account findAccountById(Integer id) {
        List<Account> accounts = jdbcTemplate.query("select * from account where id = ?",new BeanPropertyRowMapper<Account>(Account.class),id);
        return accounts.isEmpty()? null : accounts.get(0);
    }
}

5、在service包下创建业务层接口IAccountService并添加方法

package com.wedu.spring15.service;

import com.wedu.spring15.domain.Account;

import java.util.List;

/**
 * 账户业务层接口
 */
public interface IAccountService {

    /**
     * 查询所有账户
     * @return
     */
    List<Account> findAllAccount();


    /**
     * 修改账户
     * @param account
     */
    void updateAccount(Account account);

    /**
     * 根据id查询账户
     * @param id
     * @return
     */
    Account findAccountById(Integer id);

    /**
     * 转账业务
     * @param sourceId 转出账户
     * @param targetId 转入账户
     * @param money 转账金额
     */
    void transfer(Integer sourceId, Integer targetId, Double money);
}

6、在service包下创建业务层接口的实现类AccountServiceImpl并实现方法

package com.wedu.spring15.service.impl;

import com.wedu.spring15.dao.IAccountDao;
import com.wedu.spring15.domain.Account;
import com.wedu.spring15.service.IAccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

/**
 * 账户业务层接口实现
 */
@Service("accountService")
@Transactional(propagation = Propagation.SUPPORTS,readOnly = true)//只读型事务的配置
public class AccountServiceImpl implements IAccountService {

    @Autowired
    private IAccountDao accountDao;

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

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

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

    @Transactional(propagation = Propagation.REQUIRED,readOnly = false)//读写型事务的配置
    @Override
    public void transfer(Integer sourceId, Integer targetId, Double money) {
        //1、根据id查询转出账户
        Account source = accountDao.findAccountById(sourceId);
        //2、根据id查询转入账户
        Account target = accountDao.findAccountById(targetId);
        //3、设置转出金额
        source.setMoney(source.getMoney() - money);
        //4、设置转入金额
        target.setMoney(target.getMoney() + money);
        //5、更新转出账户
        accountDao.updateAccount(source);

        //int i = 1/0;

        //6、更新转入账户
        accountDao.updateAccount(target);
    }
}

7、在config包下创建配置类SpringConfiguration

package com.wedu.spring15.config;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.context.annotation.PropertySource;
import org.springframework.transaction.annotation.EnableTransactionManagement;

@Configuration
@ComponentScan("com.wedu.spring15")
@Import({JdbcConfiguration.class,TransactionConfig.class})
@PropertySource("classpath:jdbc.properties")
@EnableTransactionManagement
public class SpringConfiguration {
}

8、在config包下创建spring连接数据库的配置类JdbcConfiguration 

package com.wedu.spring15.config;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.datasource.DriverManagerDataSource;

import javax.sql.DataSource;

/**
 * spring连接数据库的配置类
 */
public class JdbcConfiguration {

    @Value("${jdbc.driver}")
    private String driver;

    @Value("${jdbc.url}")
    private String url;

    @Value("${jdbc.username}")
    private String username;

    @Value("${jdbc.password}")
    private String password;

    @Bean(name = "jdbcTemplate")
    public JdbcTemplate createJdbcTemplate(DataSource dataSource) {
        return new JdbcTemplate(dataSource);
    }

    @Bean(name = "dataSource")
    public DataSource createDataSource() {
        DriverManagerDataSource dataSource = new DriverManagerDataSource();
        dataSource.setDriverClassName(driver);
        dataSource.setUrl(url);
        dataSource.setUsername(username);
        dataSource.setPassword(password);
        return dataSource;
    }
}

9、在config包下创建spring事务管理的配置类TransactionConfig

package com.wedu.spring15.config;

import org.springframework.context.annotation.Bean;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.PlatformTransactionManager;

import javax.sql.DataSource;

/**
 * spring事务管理配置类
 */
public class TransactionConfig {
    /**
     * 用于创建事务管理器对象
     * @param dataSource
     * @return
     */
    @Bean(name="transactionManager")
    public PlatformTransactionManager createTransactionManager(DataSource dataSource){
        return new DataSourceTransactionManager(dataSource);
    }
}

10、在测试模块中创建测试类AccountServiceTest并编写转账业务测试方法

package com.wedu.spring15.service;

import com.wedu.spring15.config.SpringConfiguration;
import com.wedu.spring15.domain.Account;
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;

import java.util.List;

/**
 * 基于纯注解的spring声明式事务控制测试
 */
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = SpringConfiguration.class)
public class AccountServiceTest {

    @Autowired
    private IAccountService accountService;

    /**
     * 查询所有账户
     */
    @Test
    public void testFindAllAccount() {
        List<Account> accounts = accountService.findAllAccount();
        for (Account account : accounts) {
            System.out.println(account);
        }
    }

    /**
     * 转账
     */
    @Test
    public void testTransfer() {
        accountService.transfer(1,2,100d);
    }
}