连接 java.sql.DriverManager 和 Properties

你可以将它们打包到 java.util.Properties 对象中，而不是在 URL 或单独的参数中指定用户和密码等连接参数（请参阅此处的完整列表 ）。

/**
 * Connect to a PostgreSQL database.
 * @param url the JDBC URL to connect to. Must start with "jdbc:postgresql:"
 * @param user the username for the connection
 * @param password the password for the connection
 * @return a connection object for the established connection
 * @throws ClassNotFoundException if the driver class cannot be found on the Java class path
 * @throws java.sql.SQLException if the connection to the database fails
 */
private static java.sql.Connection connect(String url, String user, String password)
    throws ClassNotFoundException, java.sql.SQLException
{
    /*
     * Register the PostgreSQL JDBC driver.
     * This may throw a ClassNotFoundException.
     */
    Class.forName("org.postgresql.Driver");
    java.util.Properties props = new java.util.Properties();
    props.setProperty("user", user);
    props.setProperty("password", password);
    /* don't use server prepared statements */
    props.setProperty("prepareThreshold", "0");
    /*
     * Tell the driver manager to connect to the database specified with the URL.
     * This may throw an SQLException.
     */
    return java.sql.DriverManager.getConnection(url, props);
}