初始化jdbcTemplate

    Resource resource = new ClassPathResource("dev.properties");
    Properties properties = null;


    try {
        properties = PropertiesLoaderUtils.loadProperties(resource);
    } catch (IOException e) {
        e.printStackTrace();
    }

    DataSource dataSource = new SimpleDriverDataSource(
            BeanUtils.instantiateClass(oracle.jdbc.driver.OracleDriver.class),
            properties.getProperty("jdbc.url"),
            properties.getProperty("jdbc.username"),
            properties.getProperty("jdbc.password"));
    jdbcTemplate = new JdbcTemplate(dataSource);