ChromeDriver 在不指定任何参数的情况下，启动监听端口会随机变化。如果需要保证其端口固定不变，可通过ChromeDriverService 打的目的
public class testChromeService{
public static void main(String[] args){
System.setProperty("webdriver.chrome.driver", "/Selenium2/selenium/chromedriver");
ChromeDriverService.Builder builder = new ChromeDriverService.Builder();
ChromeDriverService chromeService = builder.usingDriverExecutable(new File("/Selenium2/selenium/chromedriver")).usingPort(3333).build();
try{
chromeService.start();
}catch(IOException e){
e.printStackTrace();
}
WebDriver driver = new ChromeDriver(chromeService);
driver.get("http://www.google.com");
WebElement searchBox = driver.findElement(By.name("q"));
searchBox.sendKeys("webdriver");
searchBox.submit();
driver.quit();
chromeService.stop();
}
}