springmvc

#### 整合Druid JdbcConfig就好了
public class JDBCConfig {
    @Bean("dataSource")
    public static DruidDataSource getDataSource(){
        DruidDataSource ds = new DruidDataSource();
        ds.setDriverClassName("com.mysql.jdbc.Driver");
        ds.setUrl("jdbc:mysql://localhost:3306/spring_db");
        ds.setUsername("root");
        ds.setPassword("itheima");
        return ds;
    }
}
别忘了在核心配置类中导入这个子配置类
    @Configuration
@Import({JDBCConfig.class})
@ComponentScan("com.itheima")
public class SpringConfig {
}
public class JdbcConfig {
    @Value("${jdbc.driver}")
    private String driver;
    @Value("${jdbc.url}")
    private String url;
    @Value("${jdbc.username}")
    private String userName;
    @Value("${jdbc.password}")
    private String password;
    
    @Bean("dataSource")
    public DataSource getDataSource(){
        DruidDataSource ds = new DruidDataSource();
        ds.setDriverClassName(driver);
        ds.setUrl(url);
        ds.setUsername(userName);
        ds.setPassword(password);
        return ds;
    }
}
@Configuration
@ComponentScan("com.itheima")
@PropertySource("classpath:jdbc.properties")外部资源文件加载@PropertySource与${}  
@Import({JdbcConfig.class})
public class SpringConfig {
}
#jdbc.properties
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/springdb
jdbc.username=root
jdbc.password=itheima