Spring04_IOC和DI實戰-有解無憂

本教程原始碼請訪問：tutorial_demo

學習本篇教程之前，需要了解（會用就行）以下內容：

資料庫連接池c3p0；

Apache Commons DbUtils，

只學習不練習一切都是假的，接下來我們利用之前學習的IOC和DI的知識結合Apache Commons DbUtils實作單表的CRUD操作，

一、需求和技術要求

1.1、需求

實作單表的CRUD

1.2、技術要求

使用Spring的IOC實作物件的管理；
使用Spring的DI實作屬性的注入；
使用Apache Commons DbUtils進行持久層操作；
使用c3p0資料庫連接池，

二、實作程序

2.1、建庫建表

DROP DATABASE IF EXISTS springlearn;
CREATE DATABASE springlearn;
USE springlearn;


DROP TABLE IF EXISTS account;
CREATE TABLE account (
  id int(11) NOT NULL AUTO_INCREMENT,
  name varchar(40) DEFAULT NULL,
  money float DEFAULT NULL,
  PRIMARY KEY (id)
) ENGINE=InnoDB AUTO_INCREMENT=8 DEFAULT CHARSET=utf8mb4;

INSERT INTO account VALUES ('1', 'aaa', '1000');
INSERT INTO account VALUES ('2', 'bbb', '1000');
INSERT INTO account VALUES ('3', 'ccc', '1000');
INSERT INTO account VALUES ('5', 'cc', '10000');
INSERT INTO account VALUES ('6', 'abc', '10000');
INSERT INTO account VALUES ('7', 'abc', '10000');

2.2、創建Maven工程并添加相關坐標

<?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>org.codeaction</groupId>
    <artifactId>account</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>

    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.2.6.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>5.1.47</version>
        </dependency>
        <dependency>
            <groupId>c3p0</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.1.2</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13</version>
            <scope>test</scope>
        </dependency>
    </dependencies>
</project>

2.3、撰寫Account物體類

package org.codeaction.domain;

import java.io.Serializable;

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 +
                '}';
    }
}

2.4、撰寫持久層介面IAccountDao

package org.codeaction.dao;

import org.codeaction.domain.Account;

import java.util.List;

public interface IAccountDao {
    List<Account> findAll();
    Account findById(Integer id);
    void save(Account account);
    void update(Account account);
    void delete(Integer id);
}

2.5、撰寫持久層實作類IAccountDaoImpl

package org.codeaction.dao.impl;

import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import org.codeaction.dao.IAccountDao;
import org.codeaction.domain.Account;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;

import java.sql.SQLException;
import java.util.List;

public class AccountDaoImpl implements IAccountDao {
    private QueryRunner queryRunner;

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

    @Override
    public List<Account> findAll() {
        List<Account> list = null;
        try {
            list = queryRunner.query("select * from account", new BeanListHandler<Account>(Account.class));
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return list;
    }

    @Override
    public Account findById(Integer id) {
        Account account = null;
        try {
            account = queryRunner.query("select * from account where id = ?",
                    new BeanHandler<Account>(Account.class), id);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return account;
    }

    @Override
    public void save(Account account) {
        Object[] params = {account.getName(), account.getMoney()};
        try {
            queryRunner.update("insert into account(name, money) values(?, ?)", params);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void update(Account account) {
        Object[] params = {account.getName(), account.getMoney(), account.getId()};
        try {
            queryRunner.update("update account set name=?, money=? where id=?", params);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void delete(Integer id) {
        Object[] params = {id};
        try {
            queryRunner.update("delete from account where id=?", id);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

2.6、撰寫業務層介面IAccountService

package org.codeaction.service;

import org.codeaction.domain.Account;

import java.util.List;

public interface IAccountService {
    List<Account> findAll();
    Account findById(Integer id);
    void save(Account account);
    void update(Account account);
    void delete(Integer id);
}

2.7、撰寫業務層實作類IAccountServiceImpl

package org.codeaction.service.impl;

import org.codeaction.dao.IAccountDao;
import org.codeaction.domain.Account;
import org.codeaction.service.IAccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

public class AccountServiceImpl implements IAccountService {
    private IAccountDao accountDao;

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

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

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

    @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);
    }
}

2.8、撰寫XML組態檔（重點）

XML組態檔在resource目錄下

<?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
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        https://www.springframework.org/schema/context/spring-context.xsd">
    <!-- 配置service -->
    <bean id="accountService" >
        <!-- 通過set方法注入dao實作類的物件 -->
        <property name="accountDao" ref="accountDao"></property>
    </bean>
    <!-- 配置dao -->
    <bean id="accountDao" >
        <!-- 通過set方法注入queryRunner實作類的物件 -->
        <property name="queryRunner" ref="queryRunner"></property>
    </bean>
    <!-- 配置queryRunner -->
    <bean id="queryRunner"  scope="prototype">
        <!-- 通過構造方法注入連接池 -->
        <constructor-arg name="ds" ref="dataSource"></constructor-arg>
    </bean>
    <!-- 配置連接池 -->
    <bean id="dataSource" >
        <!-- 通過set方法注入四大引數 -->
        <property name="driverClass" value="https://www.cnblogs.com/codeaction/p/com.mysql.jdbc.Driver"></property>
        <property name="jdbcUrl" value="https://www.cnblogs.com/codeaction/p/jdbc:mysql://localhost:3306/springlearn"></property>
        <property name="user" value="https://www.cnblogs.com/codeaction/p/root"></property>
        <property name="password" value="https://www.cnblogs.com/codeaction/p/123456"></property>
    </bean>
</beans>

Spring組態檔是這個專案的核心，同時也是通過這個組態檔的配置實作IOC和DI，結合前面的Java代碼，bean的配置通過IOC的方式由Spring容器管理，屬性通過DI的方式由Spring容器注入，

2.9、撰寫測驗類

package org.codeaction.test;

import org.codeaction.domain.Account;
import org.codeaction.service.IAccountService;
import org.codeaction.service.impl.AccountServiceImpl;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.util.List;

public class MyTest {
    private IAccountService accountService;
    @Before
    public void init() {
        ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
        accountService = context.getBean("accountService", AccountServiceImpl.class);
    }

    @Test
    public void testFindAll() {
        List<Account> accounts = accountService.findAll();
        for (Account account : accounts) {
            System.out.println(account);
        }
    }

    @Test
    public void testFindById() {
        Account account = accountService.findById(3);
        System.out.println(account);
    }

    @Test
    public void testSave() {
        Account account = new Account();
        account.setName("abc");
        account.setMoney(10000F);

        accountService.save(account);

        System.out.println(account);
    }

    @Test
    public void testDelete() {
        accountService.delete(4);
    }

    @Test
    public void testUpdate() {
        Account account = new Account();
        account.setId(5);
        account.setName("ab111111111c111");
        account.setMoney(10000F);
        accountService.update(account);
    }
}

分別運行測驗方法進行測驗，

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標籤：Java

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