spring 5.x 系列第5篇 —— 整合 mybatis + druid 连接池 (xml配置方式)

项目目录结构

1. 导入依赖

创建 maven 工程，除了 Spring 的基本依赖外，还需要导入 Mybatis 和 Druid 的相关依赖：

<dependency>
    <groupId>org.springframeworkgroupId>
    <artifactId>spring-jdbcartifactId>
    <version>${spring-base-version}version>
dependency>
<dependency>
    <groupId>mysqlgroupId>
    <artifactId>mysql-connector-javaartifactId>
    <version>8.0.13version>
dependency>
<dependency>
    <groupId>com.oraclegroupId>
    <artifactId>ojdbc6artifactId>
    <version>11.2.0.3.0version>
dependency>

<dependency>
    <groupId>org.mybatisgroupId>
    <artifactId>mybatis-springartifactId>
    <version>1.3.2version>
dependency>
<dependency>
    <groupId>org.mybatisgroupId>
    <artifactId>mybatisartifactId>
    <version>3.4.6version>
dependency>

<dependency>
    <groupId>com.alibabagroupId>
    <artifactId>druidartifactId>
    <version>1.1.12version>
dependency>

2. web.xml 配置

在 web.xml 中配置 Spring 的前端控制器以及 Druid 的 Web 监控台，用于获取数据库的相关监控信息：

<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
		 http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">

    
    <servlet>
        <servlet-name>springMvcservlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServletservlet-class>
        <init-param>
            <param-name>contextConfigLocationparam-name>
            <param-value>classpath:springApplication.xmlparam-value>
        init-param>
        <load-on-startup>1load-on-startup>
    servlet>

    <servlet-mapping>
        <servlet-name>springMvcservlet-name>
        <url-pattern>/url-pattern>
    servlet-mapping>

    
    <servlet>
        <servlet-name>DruidStatViewservlet-name>
        <servlet-class>com.alibaba.druid.support.http.StatViewServletservlet-class>
        <init-param>
            
            <param-name>resetEnableparam-name>
            <param-value>trueparam-value>
        init-param>
        <init-param>
            
            <param-name>loginUsernameparam-name>
            <param-value>druidparam-value>
        init-param>
        <init-param>
            
            <param-name>loginPasswordparam-name>
            <param-value>druidparam-value>
        init-param>
    servlet>
    <servlet-mapping>
        <servlet-name>DruidStatViewservlet-name>
        <url-pattern>/druid/*url-pattern>
    servlet-mapping>

    
    <filter>
        <filter-name>DruidWebStatFilterfilter-name>
        <filter-class>com.alibaba.druid.support.http.WebStatFilterfilter-class>
        <init-param>
            <param-name>exclusionsparam-name>
            <param-value>*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*param-value>
        init-param>
    filter>
    <filter-mapping>
        <filter-name>DruidWebStatFilterfilter-name>
        <url-pattern>/*url-pattern>
    filter-mapping>

web-app>

3. 数据库配置

在 resources 文件夹下新建数据库配置文件 jdbc.properties：

# mysql 数据库配置
mysql.url=jdbc:mysql://localhost:3306/mysql
mysql.username=root
mysql.password=root

# oracle 数据库配置
oracle.url=jdbc:oracle:thin:@//IP 地址:端口号/数据库实例名
oracle.username=用户名
oracle.password=密码

4. Druid 连接池配置

在 resources 文件夹下创建 springApplication.xml 配置文件和 druid.xml 配置文件：

<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:tx="http://www.springframework.org/schema/tx"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
                           http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">

    
    <context:component-scan base-package="com.heibaiying.*"/>

    
    <mvc:default-servlet-handler/>

    
    <mvc:annotation-driven/>

    
    <import resource="druid.xml"/>

    
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        
        <property name="mapperLocations" value="classpath*:/mappers/**/*.xml"/>
        <property name="configLocation" value="classpath:mybatisConfig.xml"/>
    bean>

    
    
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        
        <property name="basePackage" value="com.heibaiying.dao"/>
    bean>

    
    <bean id="transactionManager"
          class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    bean>

    
    <tx:annotation-driven/>

beans>

<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 http://www.springframework.org/schema/beans/spring-beans.xsd
                           http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd">

    
    <context:property-placeholder location="classpath:jdbc.properties"/>

    
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">
        
        <property name="url" value="${mysql.url}"/>
        <property name="username" value="${mysql.username}"/>
        <property name="password" value="${mysql.password}"/>

        
        <property name="initialSize" value="5"/>
        <property name="minIdle" value="10"/>
        <property name="maxActive" value="20"/>

        
        <property name="maxWait" value="60000"/>

        
        <property name="timeBetweenEvictionRunsMillis" value="2000"/>

        
        <property name="minEvictableIdleTimeMillis" value="600000"/>
        
        <property name="maxEvictableIdleTimeMillis" value="900000"/>

        
        <property name="validationQuery" value="select 'x'"/>
        
        <property name="testWhileIdle" value="true"/>
        
        <property name="testOnBorrow" value="false"/>
        
        <property name="testOnReturn" value="false"/>

        
        <property name="keepAlive" value="true"/>
        <property name="phyMaxUseCount" value="100000"/>

        
        <property name="filters" value="stat"/>
    bean>

beans>

5. MyBatis 配置

新建 mybtais 配置文件，按照需求配置额外参数， 更多 settings 配置项可以参考 官方文档

<configuration>
    <settings>
        
        <setting name="mapUnderscoreToCamelCase" value="true"/>
        
        <setting name="logImpl" value="STDOUT_LOGGING"/>
    settings>

configuration>

6. 数据查询

新建查询接口及其实现类，以下示例分别查询的是 MySQL 和 Oracle 中的字典表：

public interface MysqlDao {

    List<Relation> get();
}

<mapper namespace="com.heibaiying.dao.MysqlDao">

    <select id="queryById" resultType="com.heibaiying.bean.Relation">
        SELECT help_keyword_id AS id,name
        FROM HELP_KEYWORD
        WHERE HELP_KEYWORD_ID = #{id}
    select>

mapper>

public interface OracleDao {

    List queryById(long id);
}

<mapper namespace="com.heibaiying.dao.OracleDao">

    <select id="queryById" resultType="com.heibaiying.bean.Flow">
        select * from APEX_030200.WWV_FLOW_CALS where ID = #{id}
    select>

mapper>

7. 测试查询

新建测试类进行测试：

@RestController
public class MysqlController {

    @Autowired
    private MysqlDao mysqlDao;

    @GetMapping("relation/{id}")
    public String get(@PathVariable(name = "id") String id) {
        return mysqlDao.queryById(id).get(0).toString();
    }
}

@RestController
public class OracleController {

    @Autowired
    private OracleDao oracleDao;

    @GetMapping("flow/{id}")
    public String get(@PathVariable(name = "id") Long id) {
        return oracleDao.queryById(id).get(0).toString();
    }
}

8. Druid 监控台

Druid Web 页面访问地址为：http://localhost:8080/druid/index.html ，可以登录后查看数据库相关监控数据：

源码GitHub地址：https://github.com/heibaiying/spring-samples-for-all