基于XML配置文件的IoC案例

该案例使用dbutils作为数据持久层，spring实现业务层，实现CRUD。
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.qublog</groupId>
    <artifactId>spring02_account_xml_ioc</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>commons-dbutils</groupId>
            <artifactId>commons-dbutils</artifactId>
            <version>1.4</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.16</version>
        </dependency>

        <dependency>
            <groupId>c3p0</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.1.2</version>
        </dependency>

        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.10</version>
        </dependency>
    </dependencies>
</project>

Account类：

package com.qublog.domain;


import java.io.Serializable;

//账户的实体类
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 +
                '}';
    }
}

AccountDao接口：

package com.qublog.dao;

import com.qublog.domain.Account;

import java.util.List;

//账户的持久层接口
public interface AccountDao {
    //查询所有
    List<Account> findAllAccount();

    //查询一个
    Account findAccountById(Integer id);

    //保存
    void saveAccount(Account account);

    //更新
    void updateAccount(Account account);

    //删除
    void deleteAccount(Integer id);
}

AccountDaoImpl类：

package com.qublog.dao.impl;

import com.qublog.dao.AccountDao;
import com.qublog.domain.Account;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;

import java.util.List;

//账户的持久层实现类
public class AccountDaoImpl implements AccountDao {

    private QueryRunner runner;

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

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

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

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

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

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

AccountService接口：

package com.qublog.service;

import com.qublog.domain.Account;

import java.util.List;

//账户的业务层接口
public interface AccountService {

    //查询所有
    List<Account> findAllAccount();

    //查询一个
    Account findAccountById(Integer id);

    //保存
    void saveAccount(Account account);

    //更新
    void updateAccount(Account account);

    //删除
    void deleteAccount(Integer id);
}

AccountServiceimpl类：

package com.qublog.service.impl;

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

import java.util.List;

//账户的业务层实现类
public class AccountServiceImpl implements AccountService {

    private AccountDao accountDao;

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

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

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

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

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

    public void deleteAccount(Integer id) {
        accountDao.deleteAccount(id);
    }
}

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/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd">
    <!-- 配置Service -->
    <bean id="accountService" class="com.qublog.service.impl.AccountServiceImpl">
        <!-- 注入dao -->
        <property name="accountDao" ref="accountDao"></property>
    </bean>

    <!-- 配置dao对象 -->
    <bean id="accountDao" class="com.qublog.dao.impl.AccountDaoImpl">
        <property name="runner" ref="runner"></property>
    </bean>

    <!-- 配置QueryRunner对象 -->
    <bean id="runner" class="org.apache.commons.dbutils.QueryRunner" scope="prototype">
        <!-- 注入数据源 -->
        <constructor-arg name="ds" ref="dataSource"></constructor-arg>
    </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>
        <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/springtest?serverTimezone=UTC"></property>
        <property name="user" value="root"></property>
        <property name="password" value="1234"></property>
    </bean>
</beans>

AccountServiceTest类：

package com.qublog.test;

import com.qublog.domain.Account;
import com.qublog.service.AccountService;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.util.List;

//使用Junit单元测试，测试我们的配置
public class AccountServiceTest {

    @Test
    public void testFindAll() {
        //获取容器
        ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");
        //得到业务层对象
        AccountService as = (AccountService) ac.getBean("accountService");
        //执行方法
        List<Account> accounts = as.findAllAccount();
        for (Account account:accounts) {
            System.out.println(account);
        }
    }

    @Test
    public void testFindOne() {
        //获取容器
        ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");
        //得到业务层对象
        AccountService as = (AccountService) ac.getBean("accountService");
        //执行方法
        Account account = as.findAccountById(1);
        System.out.println(account);
    }

    @Test
    public void testSave() {
        //获取容器
        ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");
        //得到业务层对象
        AccountService as = (AccountService) ac.getBean("accountService");
        //执行方法
        Account account = new Account();
        account.setName("test");
        account.setMoney(666f);
        as.saveAccount(account);
    }

    @Test
    public void testUpdate() {
        //获取容器
        ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");
        //得到业务层对象
        AccountService as = (AccountService) ac.getBean("accountService");
        //执行方法
        Account account = as.findAccountById(4);
        account.setMoney(23456f);
        as.updateAccount(account);
    }

    @Test
    public void testDelete() {
        //获取容器
        ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");
        //得到业务层对象
        AccountService as = (AccountService) ac.getBean("accountService");
        //执行方法
        as.deleteAccount(4);
    }
}