非spring项目Druid配置keepAlive参数不生效（附解决方案）_druidkeepalive不生效

背景：目前我司使用了阿里的druid来进行连接池管理连接，对接了n种数据库类型，因为创建连接很耗时，所以需要开启保活机制。

项目类型：gradle项目（非spring项目）

dataSource创建方式：DruidDataSourceFactory.createDataSource()，对应源码：

 public static DataSource createDataSource(Properties properties) throws Exception {
        return createDataSource((Map) properties);
    }
 
 public static DataSource createDataSource(Map properties) throws Exception {
        DruidDataSource dataSource = new DruidDataSource();
        config(dataSource, properties);
        return dataSource;
    }

起初对这块不太熟悉，直接在前人的代码上进行了简单修改，发布一段时间后发现并没有生效，后通过查阅资料和翻看源码得知，DruidDataSourceFactory中的config方法并没有keepAlive的参数设置，源码如下：

public class DruidDataSourceFactory implements ObjectFactory {
 
    private final static Log LOG = LogFactory.getLog(DruidDataSourceFactory.class);
 
    static final int UNKNOWN_TRANSACTIONISOLATION = -1;
 
    public final static String PROP_DEFAULTAUTOCOMMIT                   = "defaultAutoCommit";
    public final static String PROP_DEFAULTREADONLY                     = "defaultReadOnly";
    public final static String PROP_DEFAULTTRANSACTIONISOLATION         = "defaultTransactionIsolation";
    public final static String PROP_DEFAULTCATALOG                      = "defaultCatalog";
    public final static String PROP_DRIVERCLASSNAME                     = "driverClassName";
    public final static String PROP_MAXACTIVE                           = "maxActive";
    public final static String PROP_MAXIDLE                             = "maxIdle";
    public final static String PROP_MINIDLE                             = "minIdle";
    public final static String PROP_INITIALSIZE                         = "initialSize";
    public final static String PROP_MAXWAIT                             = "maxWait";
    public final static String PROP_TESTONBORROW                        = "testOnBorrow";
    public final static String PROP_TESTONRETURN                        = "testOnReturn";
    public final static String PROP_TIMEBETWEENEVICTIONRUNSMILLIS       = "timeBetweenEvictionRunsMillis";
    public final static String PROP_NUMTESTSPEREVICTIONRUN              = "numTestsPerEvictionRun";
    public final static String PROP_MINEVICTABLEIDLETIMEMILLIS          = "minEvictableIdleTimeMillis";
    public final static String PROP_PHY_TIMEOUT_MILLIS                  = "phyTimeoutMillis