public void configure() throws IOException {
		// Read config file
		sConfig = new Properties();
		String configFile = DEFAULT_CONFIG_FILE;
		if (System.getProperty("selenuim_config")!=null){
			configFile = System.getProperty("selenuim_config");
		}
		sConfig.load(new FileReader(configFile));

		// Prepare capabilities
		sCaps = new DesiredCapabilities();
		sCaps.setCapability("takesScreenshot", false);

		String driver = sConfig.getProperty("driver", DRIVER_PHANTOMJS);

		// Fetch PhantomJS-specific configuration parameters
		if (driver.equals(DRIVER_PHANTOMJS)) {
			// "phantomjs_exec_path"
			if (sConfig.getProperty("phantomjs_exec_path") != null) {
				sCaps.setCapability(
						PhantomJSDriverService.PHANTOMJS_EXECUTABLE_PATH_PROPERTY,
						sConfig.getProperty("phantomjs_exec_path"));
			} else {
				throw new IOException(
						String.format(
								"Property '%s' not set!",
								PhantomJSDriverService.PHANTOMJS_EXECUTABLE_PATH_PROPERTY));
			}
			// "phantomjs_driver_path"
			if (sConfig.getProperty("phantomjs_driver_path") != null) {
				System.out.println("Test will use an external GhostDriver");
				sCaps.setCapability(
						PhantomJSDriverService.PHANTOMJS_GHOSTDRIVER_PATH_PROPERTY,
						sConfig.getProperty("phantomjs_driver_path"));
			} else {
				System.out
						.println("Test will use PhantomJS internal GhostDriver");
			}
		}

		// Disable "web-security", enable all possible "ssl-protocols" and
		// "ignore-ssl-errors" for PhantomJSDriver
		// sCaps.setCapability(PhantomJSDriverService.PHANTOMJS_CLI_ARGS, new
		// String[] {
		// "--web-security=false",
		// "--ssl-protocol=any",
		// "--ignore-ssl-errors=true"
		// });

		ArrayList<String> cliArgsCap = new ArrayList<String>();
		cliArgsCap.add("--web-security=false");
		cliArgsCap.add("--ssl-protocol=any");
		cliArgsCap.add("--ignore-ssl-errors=true");
		sCaps.setCapability(PhantomJSDriverService.PHANTOMJS_CLI_ARGS,
				cliArgsCap);

		// Control LogLevel for GhostDriver, via CLI arguments
		sCaps.setCapability(
				PhantomJSDriverService.PHANTOMJS_GHOSTDRIVER_CLI_ARGS,
				new String[] { "--logLevel="
						+ (sConfig.getProperty("phantomjs_driver_loglevel") != null ? sConfig
								.getProperty("phantomjs_driver_loglevel")
								: "INFO") });

		// String driver = sConfig.getProperty("driver", DRIVER_PHANTOMJS);

		// Start appropriate Driver
		if (isUrl(driver)) {
			sCaps.setBrowserName("phantomjs");
			mDriver = new RemoteWebDriver(new URL(driver), sCaps);
		} else if (driver.equals(DRIVER_FIREFOX)) {
			mDriver = new FirefoxDriver(new FirefoxOptions(sCaps));
		} else if (driver.equals(DRIVER_CHROME)) {
			mDriver = new ChromeDriver(new ChromeOptions().merge(sCaps));
		} else if (driver.equals(DRIVER_PHANTOMJS)) {
			mDriver = new PhantomJSDriver(sCaps);
		}
	}
Configure the GhostDriver, and initialize a WebDriver instance. This part
of code comes from GhostDriver.
https://github.com/detro/ghostdriver/tree/master/test/java/src/test/java/ghostdriver

@author bob.li.0718@gmail.com
@throws IOException
webmagic-selenium/src/main/java/us/codecraft/webmagic/downloader/selenium/WebDriverPool.java