DataSourceConfiguration.java

@Configuration
// 配置mybatis mapper的扫描路径
@MapperScan("ink.xlr.demo.dao")
public class DataSourceConfiguration {
    @Value("${jdbc.driver}")
    private String jdbcDriver;
    @Value("${jdbc.url}")
    private String jdbcUrl;
    @Value("${jdbc.user}")
    private String jdbcUsername;
    @Value("${jdbc.password}")
    private String jdbcPassword;

    @Bean(name = "dataSource")
    public ComboPooledDataSource createDataSource() throws PropertyVetoException {
        ComboPooledDataSource dataSource = new ComboPooledDataSource();
        dataSource.setDriverClass(jdbcDriver);
        dataSource.setJdbcUrl(jdbcUrl);
        dataSource.setUser(jdbcUsername);
        dataSource.setPassword(jdbcPassword);
        // 关闭连接后 不自动commit
        dataSource.setAutoCommitOnClose(false);
        return dataSource;
    }
}

application.properties

# tomcat运行端口
server.port=8082
# 项目根路径
server.servlet.context-path=/demo

# c3p0数据源配置
jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/springboot_test?characterEncoding=UTF-8&serverTimezone=UTC&useSSL=false
jdbc.user=root
jdbc.password=123456789

# Mybatis配置文件
mybatis_config_file=mybatis-config.xml
# mapper文件路径
mapper_path=/mapper/**.xml
# 实体类路径
entity_package=ink.xlr.demo.entity

SessionFactoryConfiguration.java

@Configuration
public class SessionFactoryConfiguration {

    // mybatis-config.xml配置文件的路径
    @Value("${mybatis_config_file}")
    private String mybatisConfigFilePath;

    // mybatis mapper文件所在路径
    @Value("${mapper_path}")
    private String mapperPath;

    // 实体类所在的package
    @Value("${entity_package}")
    private String entityPackage;

    @Autowired
    @Qualifier("dataSource")
    private DataSource dataSource;

    @Bean(name="sqlSessionFactory")
    public SqlSessionFactoryBean createSqlSessionFactoryBean() throws IOException {
        SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
        // 扫描mybatis配置文件
        sqlSessionFactoryBean.setConfigLocation(new ClassPathResource(mybatisConfigFilePath));
        // 扫描相关mapper文件
        PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
        String packageSearchPath = PathMatchingResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX + mapperPath;
        sqlSessionFactoryBean.setMapperLocations(resolver.getResources(packageSearchPath));
        // 调用dataSource
        sqlSessionFactoryBean.setDataSource(dataSource);
        // 映射实体类
        sqlSessionFactoryBean.setTypeAliasesPackage(entityPackage);
        return sqlSessionFactoryBean;
    }
}

pom.xml

   <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.0.1</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.mchange/c3p0 -->
        <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.5.2</version>
        </dependency>