1 需求和技术要求
1.1 需求
1.2 技术要求
- 使用Spring的IOC实现对象的管理。
- 使用QueryRunner作为持久层的解决方案。
- 使用C3p0作为数据源。
2 环境搭建并配置
2.1 导入所需要的依赖jar包的maven坐标
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.2.0.RELEASE</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.17</version>
</dependency>
<dependency>
<groupId>commons-dbutils</groupId>
<artifactId>commons-dbutils</artifactId>
<version>1.7</version>
</dependency>
<dependency>
<groupId>com.mchange</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.5.4</version>
</dependency>
2.2 数据库脚本
SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;
-- ----------------------------
-- Table structure for account
-- ----------------------------
DROP TABLE IF EXISTS `account`;
CREATE TABLE `account` (
`id` int(11) NOT NULL AUTO_INCREMENT COMMENT '主键',
`name` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '名称',
`money` double(11, 0) NULL DEFAULT NULL COMMENT '余额',
PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;
-- ----------------------------
-- Records of account
-- ----------------------------
INSERT INTO `account` VALUES (1, 'aaa', 1000);
INSERT INTO `account` VALUES (2, 'bbb', 1000);
SET FOREIGN_KEY_CHECKS = 1;
2.3 编写实体类
package com.sunxiaping.spring5.domain;
import java.io.Serializable;
/**
* 账户
*/
public class Account implements Serializable {
private Integer id;
private String name;
private Double 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 Double getMoney() {
return money;
}
public void setMoney(Double money) {
this.money = money;
}
}
2.4 编写持久层代码
package com.sunxiaping.spring5.dao;
import com.sunxiaping.spring5.domain.Account;
import java.util.List;
/**
* 账户的持久层接口
*/
public interface IAccountDao {
/**
* 保存账户
*
* @param account
*/
void save(Account account);
/**
* 更新账户
*
* @param account
*/
void update(Account account);
/**
* 删除账户
*
* @param id
*/
void delete(Integer id);
/**
* 根据主键查询账户信息
*
* @param id
* @return
*/
Account findById(Integer id);
/**
* 查询所有
*
* @return
*/
List<Account> findAll();
}
package com.sunxiaping.spring5.dao.impl;
import com.sunxiaping.spring5.dao.IAccountDao;
import com.sunxiaping.spring5.domain.Account;
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.sql.SQLException;
import java.util.List;
@Repository
public class AccountDaoImpl implements IAccountDao {
@Autowired
private QueryRunner queryRunner;
@Override
public void save(Account account) {
try {
queryRunner.update("insert into account(name,money) values (?,?)", account.getName(), account.getMoney());
} catch (SQLException e) {
e.printStackTrace();
}
}
@Override
public void update(Account account) {
try {
queryRunner.update("update account set name=?,money=? where id = ?", account.getName(), account.getMoney(), account.getId());
} catch (SQLException e) {
e.printStackTrace();
}
}
@Override
public void delete(Integer id) {
try {
queryRunner.update("delete from account where id = ?", id);
} catch (SQLException e) {
e.printStackTrace();
}
}
@Override
public Account findById(Integer id) {
try {
return queryRunner.query("select * from account where id = ?", new BeanHandler<>(Account.class), id);
} catch (SQLException e) {
e.printStackTrace();
}
return null;
}
@Override
public List<Account> findAll() {
try {
return queryRunner.query("select * from account", new BeanListHandler<>(Account.class));
} catch (SQLException e) {
e.printStackTrace();
}
return null;
}
}
2.5 编写业务层代码
package com.sunxiaping.spring5.service;
import com.sunxiaping.spring5.domain.Account;
import java.util.List;
public interface IAccountService {
/**
* 保存账户
*
* @param account
*/
void save(Account account);
/**
* 更新账户
*
* @param account
*/
void update(Account account);
/**
* 删除账户
*
* @param id
*/
void delete(Integer id);
/**
* 根据主键查询账户信息
*
* @param id
* @return
*/
Account findById(Integer id);
/**
* 查询所有
*
* @return
*/
List<Account> findAll();
}
package com.sunxiaping.spring5.service.impl;
import com.sunxiaping.spring5.dao.IAccountDao;
import com.sunxiaping.spring5.domain.Account;
import com.sunxiaping.spring5.service.IAccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class AccountServiceImpl implements IAccountService {
@Autowired
private IAccountDao accountDao;
@Override
public void save(Account account) {
accountDao.save(account);
}
@Override
public void update(Account account) {
accountDao.update(account);
}
@Override
public void delete(Integer id) {
accountDao.delete(id);
}
@Override
public Account findById(Integer id) {
return accountDao.findById(id);
}
@Override
public List<Account> findAll() {
return accountDao.findAll();
}
}
2.6 创建并配置applicationContext.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:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<!--告知Spring创建容器的时候要扫描的包-->
<context:component-scan base-package="com.sunxiaping.spring5"></context:component-scan>
<!--配置QueryRunner-->
<bean id="queryRunner" class="org.apache.commons.dbutils.QueryRunner" scope="prototype">
<constructor-arg name="ds" ref="dataSource"></constructor-arg>
</bean>
<!--配置数据源-->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="jdbcUrl" value="jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF-8&autoReconnect=true&useSSL=false&serverTimezone=GMT%2B8&allowPublicKeyRetrieval=true"></property>
<property name="driverClass" value="com.mysql.cj.jdbc.Driver"></property>
<property name="user" value="root"></property>
<property name="password" value="123456"></property>
</bean>
</beans>
2.7 测试
package com.sunxiaping;
import com.sunxiaping.spring5.domain.Account;
import com.sunxiaping.spring5.service.IAccountService;
import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class spring5Test {
ApplicationContext context = null;
@Before
public void before() {
context = new ClassPathXmlApplicationContext("applicationContext.xml");
}
@Test
public void test() {
IAccountService accountService = context.getBean(IAccountService.class);
Account account = new Account();
account.setName("xxx");
account.setMoney(1.2);
accountService.save(account);
}
}