SSM——Spring（三）基于XML方式的IoC实现账户的CRUD

一、需求和技术要求

1.需求

实现账户的CRUD操作

2.技术要求

使用Spring的IoC实现对象的管理
使用DBAssit作为持久层的解决方案
使用c3p0数据源

二、环境搭建

1.创建普通maven工程，配置pom.xml，导入依赖jar包坐标

<?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.beizhen</groupId>
    <artifactId>spring02</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>5.1.6</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>

2.创建数据库

create table account(
id int primary key auto_increment,
name varchar(40),
money float
)character set utf8 collate utf8_general_ci;
insert into account(name,money) values('aaa',1000);
insert into account(name,money) values('bbb',1000);
insert into account(name,money) values('ccc',1000);

3.编写实体类

package com.beizhen.domain;

import java.io.Serializable;

/**
 * 账户实体类
 * @author : Bei-Zhen
 * @date : 2020-11-17 22:31
 */
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 +
                '}';
    }
}

4.编写持久层代码

package com.beizhen.dao;

import com.beizhen.domain.Account;

import java.util.List;

/**
 * 账户的持久层接口
 * @author : Bei-Zhen
 * @date : 2020-11-17 22:33
 */
public interface IAccountDao {
     

    /**
     * 保存账户
     * @param account
     */
    void save(Account account);

    /**
     * 删除账户
     * @param accountId
     */
    void delete(Integer accountId);

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

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

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

package com.beizhen.dao.impl;

import com.beizhen.dao.IAccountDao;
import com.beizhen.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
 * @author : Bei-Zhen
 * @date : 2020-11-17 22:37
 */
public class AccountDaoImpl implements IAccountDao {
     

    private QueryRunner runner;

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

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

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

    @Override
    public void update(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);
        }
    }

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

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

5.编写业务层代码

package com.beizhen.service.impl;

import com.beizhen.dao.IAccountDao;
import com.beizhen.domain.Account;
import com.beizhen.service.IAccountService;

import java.util.List;

/**
 * 账户的业务层实现类
 * @author : Bei-Zhen
 * @date : 2020-11-17 22:58
 */
public class AccountServiceImpl implements IAccountService {
     

    private IAccountDao accountDao;

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

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

    @Override
    public void delete(Integer accountId) {
     
        accountDao.delete(accountId);
    }

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

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

    @Override
    public Account findById(Integer accountId) {
     
        return accountDao.findById(accountId);
    }
}

package com.beizhen.service;

import com.beizhen.domain.Account;

import java.util.List;

/**
 * 账户的业务层接口
 * @author : Bei-Zhen
 * @date : 2020-11-17 22:57
 */
public interface IAccountService {
     

    /**
     * 保存账户
     * @param account
     */
    void save(Account account);

    /**
     * 删除账户
     * @param accountId
     */
    void delete(Integer accountId);

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

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

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

6.创建并编写配置文件

<?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">
</beans>

三、配置步骤

配置对象

<?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serice-->
    <bean id="accountService" class="com.beizhen.service.impl.AccountServiceImpl">
        <property name="accountDao" ref="account"></property>
    </bean>

<!--    配置dao-->
    <bean id="account" class="com.beizhen.dao.impl.AccountDaoImpl">
        <property name="queryRunner" ref="runner"></property>
    </bean>

<!--    配置QueryRunner-->
    <bean id="runner" class="org.apache.commons.dbutils.QueryRunner" scope="prototype">
        <constructor-arg name="ds" ref="dataSource"></constructor-arg>
    </bean>

<!--    配置数据库-->
    <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.jdbc.Driver"></property>
        <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/ssm"></property>
        <property name="user" value="root"></property>
        <property name="password" value="root"></property>
     </bean>
</beans>

四、测试案例

测试类代码

package com.beizhen.test;

import com.beizhen.domain.Account;
import com.beizhen.service.IAccountService;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.util.List;

/**
 * 测试springIoC的CRUD
 * @author : Bei-Zhen
 * @date : 2020-11-17 23:13
 */
public class TestSpringIocCRUD {
     

    @Test
    public void testSave(){
     
        Account account = new Account();
        account.setName("beizhen");
        account.setMoney(1000.0f);
        //1.获取容器
        ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");
        //2.得到业务层对象
        IAccountService as = ac.getBean("accountService",IAccountService.class);
        //3.执行方法
        as.save(account);
    }

    @Test
    public void testDelete(){
     
        //1.获取容器
        ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");
        //2.得到业务层对象
        IAccountService as = ac.getBean("accountService",IAccountService.class);
        //3.执行方法
        as.delete(4);
    }

    @Test
    public void testUpdate(){
     
        Account account = new Account();
        account.setId(1);
        account.setName("beizhen");
        account.setMoney(1000.0f);
        //1.获取容器
        ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");
        //2.得到业务层对象
        IAccountService as = ac.getBean("accountService",IAccountService.class);
        //3.执行方法
        as.update(account);
    }

    @Test
    public void testfindAll(){
     
        //1.获取容器
        ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");
        //2.得到业务层对象
        IAccountService as = ac.getBean("accountService",IAccountService.class);
        //3.执行方法
        List<Account> accounts = as.findAll();
        for (Account account : accounts) {
     
            System.out.println(account);
        }
    }

    @Test
    public void testfindById(){
     
        //1.获取容器
        ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");
        //2.得到业务层对象
        IAccountService as = ac.getBean("accountService",IAccountService.class);
        //3.执行方法
        Account account = as.findById(1);
        System.out.println(account);
    }

}

查询所有运行结果