搭健MyBatis开发环境

相关文献资料地址：http://www.mybatis.org/mybatis-3/zh/getting-started.html

关于如何创建一个项目，添加Tomcat运行环境和生成`web.xml`文件就不说了，我这边的Tomcat运行环境是8.5的

一、需要在`pom.xml`中添加项目使用的依赖：

<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>cn.tedu.mybatis</groupId>
  <artifactId>MYBATIS_TEST_02</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>war</packaging>
  <dependencies>
       <!-- 用来测试的依赖 -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
        <!-- 添加SpringMVC依赖，视情况添加 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>4.3.9.RELEASE</version>
        </dependency>
        <!-- 添加MyBatis的依赖 -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.6</version>
        </dependency>
        <!-- 添加MyBatis整合Spring的依赖 -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.2</version>
        </dependency>
        <!-- 其底层是基于JDBC的，所以，还需要添加Spring-jdbc的依赖，需要注意的是: 此依赖版本必须与Spring-webmvc的保持一致，也可以理解成带Spring-的版本都
            保持一致 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>4.3.9.RELEASE</version>
        </dependency>
        <!-- 根据使用的数据库，添加数据库连接驱动的依赖 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.13</version>
        </dependency>
        <!-- 添加数据源的依赖 -->
        <dependency>
            <groupId>commons-dbcp</groupId>
            <artifactId>commons-dbcp</artifactId>
            <version>1.4</version>
        </dependency>
  </dependencies>
</project>

二、在`src/main/resources`下创建`db.properties`文件（文件名可以自己取），用于配置数据库连接的相关信息：

url=jdbc:mysql://localhost:3306/tedu_ums?useUnicode=true&characterEncoding=utf-8&serverTimezone=Asia/Shanghai   #（这边连接的数据库名字似情况而定，我这边是tedu_ums）
    driver=com.mysql.cj.jdbc.Driver
    username=root 　　#（数据库账号）
    password=root 　　#（数据库密码）
    initialSize=2 　　#（池启动时创建的连接数量）
    maxActive=50   #（同一时间可以从池分配的最多连接数量。设置为0时表示无限制）

#这是一个注释
url=jdbc:mysql://localhost:3306/tedu_ums?useUnicode=true&characterEncoding=utf-8&serverTimezone=Asia/Shanghai
driver=com.mysql.cj.jdbc.Driver
username=root
password=
initialSize=2
maxActive=50

三、在项目中准备名为`spring-dao.xml`的Spring配置文件，放在`src/main/resources`下并加载以上数据库的配置文件：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
    xmlns:jdbc="http://www.springframework.org/schema/jdbc" xmlns:jee="http://www.springframework.org/schema/jee"
    xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:util="http://www.springframework.org/schema/util"
    xmlns:jpa="http://www.springframework.org/schema/data/jpa"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd
        http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsd
        http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
        http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.2.xsd">
    <!-- 加载数据库的配置文件 -->
    <util:properties id="dbConfig" location="classpath:db.properties"></util:properties>
<!--     配置数据源 -->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
<property name="url" value="#{dbConfig.url}"></property>
<property name="driverClassName" value="#{dbConfig.driver}"></property>
<property name="username" value="#{dbConfig.username}"></property>
<property name="password" value="#{dbConfig.password}"></property>
<property name="initialSize" value="#{dbConfig.initialSize}"></property>
<property name="maxActive" value="#{dbConfig.maxActive}"></property>
</bean>
</beans>

四、完成后在测试类那边测试看看是否可以正确的获取到数据库的连接：

package web;

import javax.sql.DataSource;

import org.apache.commons.dbcp.BasicDataSource;
import org.junit.Test;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.mapper.MapperScannerConfigurer;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.context.support.AbstractApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class TestDemo {
    MapperScannerConfigurer ks;
    SqlSessionFactoryBean bs;
    @Test
    public void getConnection() {
        AbstractApplicationContext ac = new ClassPathXmlApplicationContext("spring-dao.xml");
        DataSource data = ac.getBean("dataSource",DataSource.class);
        System.out.println(data);
        ac.close();

    }

}

我这边输出：jdbc:mysql://localhost:3306/tedu_ums?useUnicode=true&characterEncoding=utf-8&serverTimezone=Asia/Shanghai, UserName=root@localhost, MySQL Connector/J