Selenium：浏览器正在打开，但无法在浏览器中获取URL

Question

    Exception in thread "main" org.openqa.selenium.WebDriverException: Timed out waiting 45 seconds for Firefox to start.
Build info: version: '3.6.0', revision: '6fbf3ec767', time: '2017-09-27T16:15:26.402Z'
System info: host: 'ADMIN-PC', ip: '192.168.1.6', os.name: 'Windows 10', os.arch: 'x86', os.version: '10.0', java.version: '1.8.0_144'
Driver info: driver.version: FirefoxDriver
at org.openqa.selenium.firefox.XpiDriverService.waitUntilAvailable(XpiDriverService.java:112)
at org.openqa.selenium.firefox.XpiDriverService.start(XpiDriverService.java:97)
at org.openqa.selenium.remote.service.DriverCommandExecutor.execute(DriverCommandExecutor.java:79)
at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:586)
at org.openqa.selenium.remote.RemoteWebDriver.startSession(RemoteWebDriver.java:217)
at org.openqa.selenium.remote.RemoteWebDriver.(RemoteWebDriver.java:140)
at org.openqa.selenium.firefox.FirefoxDriver.(FirefoxDriver.java:120)
at org.openqa.selenium.firefox.FirefoxDriver.(FirefoxDriver.java:98)
at FacebookFriends.main(FacebookFriends.java:18)
Caused by: org.openqa.selenium.net.UrlChecker$TimeoutException: Timed out waiting for [http://localhost:45149/hub/status] to be available after 45005 ms
at org.openqa.selenium.net.UrlChecker.waitUntilAvailable(UrlChecker.java:100)
at org.openqa.selenium.firefox.XpiDriverService.waitUntilAvailable(XpiDriverService.java:110)
... 8 more
Caused by: java.util.concurrent.TimeoutException
at java.util.concurrent.FutureTask.get(Unknown Source)
at com.google.common.util.concurrent.SimpleTimeLimiter.callWithTimeout(SimpleTimeLimiter.java:147)
at org.openqa.selenium.net.UrlChecker.waitUntilAvailable(UrlChecker.java:75)
... 9 more

Answer 1

File gecko = new File("C:/Users/admin/Downloads/geckodriver-v0.19.0-win32/geckodriver.exe");    
System.setProperty("webdriver.gecko.driver", gecko.getAbsolutePath());