如何从任意位置使用JDBC驱动程序

从文章中选择运行时的JDBC驱动程序；我将在此处发布代码以供参考。

这样做的目的是欺骗驱动程序管理器，使其认为驱动程序是从系统类加载器加载的。为此，我们使用此类：

public class DelegatingDriver implements Driver{    private final Driver driver;    public DelegatingDriver(Driver driver)    {        if (driver == null)        { throw new IllegalArgumentException("Driver must not be null.");        }        this.driver = driver;    }    public Connection connect(String url, Properties info) throws SQLException    {       return driver.connect(url, info);    }    public boolean acceptsURL(String url) throws SQLException    {       return driver.acceptsURL(url);    }    public DriverPropertyInfo[] getPropertyInfo(String url, Properties info) throws SQLException    {        return driver.getPropertyInfo(url, info);    }    public int getMajorVersion()    {        return driver.getMajorVersion();    }    public int getMinorVersion()    {        return driver.getMinorVersion();    }    public boolean jdbcCompliant()    {         return driver.jdbcCompliant();    }}

这样，您注册的驱动程序就是

DelegatingDriver

URLClassLoader classLoader = new URLClassLoader(new URL[]{"path to my jdbc driver jar"}, this.getClass().getClassLoader());Driver driver = (Driver) Class.forName("org.postgresql.Driver", true, classLoader).newInstance();DriverManager.registerDriver(new DelegatingDriver(driver)); // register using the Delegating DriverDriverManager.getDriver("jdbc:postgresql://host/db"); // checks that the driver is found