新建一个 maven 工程

一、pom.xml 配置

<?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>spring05</groupId><artifactId>spring05</artifactId><version>1.0-SNAPSHOT</version><packaging>jar</packaging><dependencies><!-- https://mvnrepository.com/artifact/org.springframework/spring-context --><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>5.1.9.RELEASE</version></dependency><!-- https://mvnrepository.com/artifact/commons-dbutils/commons-dbutils --><dependency><groupId>commons-dbutils</groupId><artifactId>commons-dbutils</artifactId><version>1.7</version></dependency><!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java --><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>6.0.6</version></dependency><!-- https://mvnrepository.com/artifact/com.mchange/c3p0 --><dependency><groupId>com.mchange</groupId><artifactId>c3p0</artifactId><version>0.9.5.4</version></dependency><!-- https://mvnrepository.com/artifact/junit/junit --><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.12</version><scope>test</scope></dependency></dependencies></project>

二、创建接口、数据库表与实体类

1.数据库表

create table account02(id int primary key auto_increment,name varchar(40),money float
);insert into account02(name,money) values ('aaa',10),('bbb',100),('ccc',1000);

2.实体类

创建 domain 文件夹

创建 Account 类生成get,set方法还有 tostring 方法

package com.domain;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;}@Overridepublic String toString() {return "Account{" +"id=" + id +", name='" + name + '\'' +", money=" + money +'}';}
}

3.数据访问层

Ⅰ 接口类

package com.dao;import com.domain.Account;import java.util.List;/*** 描述：〈账户的持久层接口〉* @author zuiren* @create 2019/8/27* @since 1.0.0*/
public interface IAccountDao {/*** 查询所有* @return*/List<Account> findAllAccount();/*** 查询一个* @param accountId* @return*/Account findAccountById(Integer accountId);/*** 保存* @param account*/void saveAccount(Account account);/*** 更新* @param account*/void updateAccount(Account account);/*** 修改* @param accountId*/void deleteAccount(Integer accountId);
}

Ⅱ 实现类

package com.dao.Impl;import com.domain.Account;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;import java.sql.SQLException;
import java.util.List;/*** 描述：* 〈账户的持久层实现类〉** @author zuiren* @create 2019/8/27* @since 1.0.0*/
public class IAccountDaoImpl implements com.dao.IAccountDao {private QueryRunner runner;public IAccountDaoImpl(QueryRunner runner) {this.runner = runner;}public List<Account> findAllAccount() {try {return runner.query("select *from account02",new BeanListHandler<Account>(Account.class));}catch (Exception e){throw new RuntimeException(e);}}public Account findAccountById(Integer accountId) {try {return runner.query("select *from account02 where id = ?",new BeanHandler<Account>(Account.class),accountId);}catch (Exception e){throw new RuntimeException(e);}}public void saveAccount(Account account) {try {runner.update("insert into account02(name,money) values(?,?)",account.getName(),account.getMoney());}catch (SQLException e){e.printStackTrace();}}public void updateAccount(Account account) {try {runner.update("update account02 set name=?,money=? where id=?",account.getName(),account.getMoney(),account.getId());}catch (SQLException e){e.printStackTrace();}}public void deleteAccount(Integer accountId) {try {runner.update("delete from account02 where id=?",accountId);}catch (SQLException e){e.printStackTrace();}}
}

4.业务逻辑层

Ⅰ 接口类

package com.service;import com.domain.Account;import java.util.List;/*** 描述：〈账户的业务层接口〉* @author zuiren* @create 2019/8/27* @since 1.0.0*/
public interface IAccountService {/*** 查询所有* @return*/List<Account> findAllAccount();/*** 查询一个* @param accountId* @return*/Account findAccountById(Integer accountId);/*** 保存* @param account*/void saveAccount(Account account);/*** 更新* @param account*/void updateAccount(Account account);/*** 修改* @param accountId*/void deleteAccount(Integer accountId);
}

Ⅱ 实现类

package com.service.Impl;import com.dao.IAccountDao;
import com.domain.Account;
import com.service.IAccountService;import java.util.List;/*** 描述：* 〈账户的业务层实现类〉** @author zuiren* @create 2019/8/27* @since 1.0.0*/
public class AccountServiceImpl implements IAccountService {private IAccountDao accountDao;public AccountServiceImpl(IAccountDao accountDao) {this.accountDao = accountDao;}public List<Account> findAllAccount() {return accountDao.findAllAccount();}public Account findAccountById(Integer accountId) {return accountDao.findAccountById(accountId);}public void saveAccount(Account account) {accountDao.saveAccount(account);}public void updateAccount(Account account) {accountDao.updateAccount(account);}public void deleteAccount(Integer accountId) {accountDao.deleteAccount(accountId);}
}

三、bean.xml

在 resources 文件夹下创建 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/beanshttps://www.springframework.org/schema/beans/spring-beans.xsd"><!--配置 Service--><bean id="accountService" class="com.service.Impl.AccountServiceImpl"><constructor-arg ref="accountDao"/><!--注入 dao--></bean><!--配置 Dao--><bean id="accountDao" class="com.dao.Impl.IAccountDaoImpl"><!--注入QueryRunner--><constructor-arg ref="runner"/></bean><!--配置QueryRunner   默认为单例对象--><bean id="runner" class="org.apache.commons.dbutils.QueryRunner" scope="prototype"><!--QueryRunner 可以带参创建，也可以无参构造，有区别，你希望每条语句独立一个事务，还是所有的语句在同一个事务中由于此处是单表，一条语句的 crud 的操作，所以此时可以选择传入数据源--><!--注入数据源--><constructor-arg name="ds" ref="dataSource"/></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.cj.jdbc.Driver"/><property name="jdbcUrl" value="jdbc:mysql://localhost:3306/test?useSSL=false&amp;serverTimezone=GMT"/><property name="user" value="root"/><property name="password" value="root"/></bean>
</beans>

四、Test

在 test 下创建 AccountServiceTest 类

package com.test;import com.domain.Account;
import com.service.IAccountService;
import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;import java.util.List;/*** 描述：* 〈使用 junit 单元测试：测试我们配置〉** @author zuiren* @create 2019/8/28* @since 1.0.0*/
public class AccountServiceTest {//1.获取容器ApplicationContext ac=null;//2.得到业务层对象IAccountService as=null;@Beforepublic void init(){//1.获取容器ac=new ClassPathXmlApplicationContext("bean.xml");//2.得到业务层对象as=ac.getBean("accountService",IAccountService.class);}@Testpublic void testFindAllAccount(){//3.执行方法List<Account> accounts = as.findAllAccount();for (Account account:accounts){System.out.println(account);}}@Testpublic void testFindAccountById(){//3.执行方法Account account=as.findAccountById(1);System.out.println(account);}@Testpublic void testSaveAccount(){//3.执行方法Account account=new Account();account.setName("卡兹克");account.setMoney(300);as.saveAccount(account);}@Testpublic void testUpdateAccount(){}@Testpublic void testDeleteAccount(){}
}

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五、基于注解

1. 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:context="http://www.springframework.org/schema/context"xsi:schemaLocation="http://www.springframework.org/schema/beanshttps://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/contexthttps://www.springframework.org/schema/context/spring-context.xsd"><!--告知 spring 在创建容器时要扫描的白--><context:component-scan base-package="com"/><bean id="runner" class="org.apache.commons.dbutils.QueryRunner" scope="prototype"><!--注入数据源--><constructor-arg name="ds" ref="dataSource"/></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.cj.jdbc.Driver"/><property name="jdbcUrl" value="jdbc:mysql://localhost:3306/test?useSSL=false&amp;serverTimezone=GMT"/><property name="user" value="root"/><property name="password" value="root"/></bean></beans>

2. dao

package com.dao.Impl;import com.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;/*** 描述：* 〈账户的持久层实现类〉** @author zuiren* @create 2019/8/27* @since 1.0.0*/
@Repository(value = "accountDao")
public class IAccountDaoImpl implements com.dao.IAccountDao {@Autowiredprivate QueryRunner runner;public List<Account> findAllAccount() {try {return runner.query("select *from account02",new BeanListHandler<Account>(Account.class));}catch (Exception e){throw new RuntimeException(e);}}public Account findAccountById(Integer accountId) {try {return runner.query("select *from account02 where id = ?",new BeanHandler<Account>(Account.class),accountId);}catch (Exception e){throw new RuntimeException(e);}}public void saveAccount(Account account) {try {runner.update("insert into account02(name,money) values(?,?)",account.getName(),account.getMoney());}catch (SQLException e){e.printStackTrace();}}public void updateAccount(Account account) {try {runner.update("update account02 set name=?,money=? where id=?",account.getName(),account.getMoney(),account.getId());}catch (SQLException e){e.printStackTrace();}}public void deleteAccount(Integer accountId) {try {runner.update("delete from account02 where id=?",accountId);}catch (SQLException e){e.printStackTrace();}}
}

3. service

package com.service.Impl;import com.dao.IAccountDao;
import com.domain.Account;
import com.service.IAccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;import javax.annotation.Resource;
import java.util.List;/*** 描述：* 〈账户的业务层实现类〉** @author zuiren* @create 2019/8/27* @since 1.0.0*/
@Service(value = "accountService")
public class AccountServiceImpl implements IAccountService {@Autowiredprivate IAccountDao accountDao;public List<Account> findAllAccount() {return accountDao.findAllAccount();}public Account findAccountById(Integer accountId) {return accountDao.findAccountById(accountId);}public void saveAccount(Account account) {accountDao.saveAccount(account);}public void updateAccount(Account account) {accountDao.updateAccount(account);}public void deleteAccount(Integer accountId) {accountDao.deleteAccount(accountId);}
}