java selenium grid实践

1. 下载jar包：selenium-server-standalone-3.141.59.jar和驱动，执行机上必须安装java环境和浏览器驱动，客户端作为控制器如果不执行测试，则不必安装驱动

2. 启动hub：
   java -jar selenium-server-standalone-3.141.59.jar -role hub -port 8888 -maxSession 10

3. 启动node：（需要保持双方能够相互通信）
   java -Dwebdriver.chrome.driver="输入驱动的确定路径" -jar selenium-server-standalone-3.141.59.jar -role node -hub "hub地址:8888/grid/register/" -port 18881 -browser "browserName=chrome,maxInstances=2,version=92,platform=MAC"

4. 测试代码：
   `public class TestMain {
   private static WebDriver driver;
   @Test
   public static void test() throws InterruptedException, MalformedURLException {
   String url1 = "http://nodeurl1:18881/wd/hub";
   String url2 = "http://nodeurl2:18882/wd/hub";
   Thread thread1 = new Thread(() -> {
   try {
   invokeBrowser(url1);
   System.out.println(Thread.currentThread().getName());

        } catch (MalformedURLException | InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println(Thread.currentThread().getName());
    });
    Thread thread2 = new Thread(() -> {
        try {
            invokeBrowser(url2);
            System.out.println(Thread.currentThread().getName());
        } catch (MalformedURLException | InterruptedException e) {
            e.printStackTrace();
        }
    });
   
    thread1.start();
    thread2.start();
    thread1.join();
    thread2.join();
   

   }

   public static void invokeBrowser(String url3) throws MalformedURLException, InterruptedException {
   // 期望能力对象
   DesiredCapabilities capabilities = new DesiredCapabilities();
   //配置测试的浏览器,使用chrome浏览器
   capabilities.setBrowserName(BrowserType.CHROME);
   capabilities.setPlatform(Platform.MAC);
   // hub节点
   String url = url3;
   //和hub建立通讯，把相应配置传给hub，hub会根据配置选择注册的node节点，打开相应的浏览器进行测试
   WebDriver driver = new RemoteWebDriver(new URL(url), capabilities);
   driver.get("https://www.baidu.com/");
   driver.findElement(By.id("kw")).sendKeys("selenium");
   Thread.sleep(5000);
   driver.quit();
   }
   }
   `