英文:
Selenium actions multithreading
问题
我想要打开多个Selenium WebDrivers，并在不同的线程中处理它们。问题是Selenium的Action类如何共享键盘/鼠标资源？
public class InterruptInput implements Runnable {
public static void main(String[] args) {
// 两个action实例将同时运行
new Thread(new InterruptInput()).start();
new Thread(new InterruptInput()).start();
}
@Override
public void run() {
// 不确定是否可以使用ChromeDriver复制相同的操作
WebDriver driver = new FirefoxDriver();
Actions act1 = new Actions(driver);
act1.moveToElement(searchBar)
.click()
.sendKeys("G")
.pause(1000)
.sendKeys("O")
.pause(1000)
.sendKeys("O")
.pause(1000)
.sendKeys("G")
.pause(1000)
.sendKeys("L")
.pause(1000)
.sendKeys("E")
.pause(1000)
.perform();
}
}
观察到的结果是：
- 会打开两个浏览器。每个浏览器会在7秒内向搜索栏输入GOOGLE。没有干扰。
- 如果我在同一页上手动点击某个地方并将搜索栏失去焦点，输入将被中断。
- 如果我手动在其中一个浏览器中打开一个新标签，或者在操作系统中切换到其他应用程序，GOOGLE将在后台完成输入。
如何实现这一点？这是否意味着我可以打开多个WebDriver实例，而不用担心阻塞I/O？这与Java的Robot类有何不同，后者会主动控制键盘和鼠标？供参考，我使用的是Windows 10。不确定是否与平台有关。
基本目的是，我正在编写一个简单的应用程序，允许用户（即我）在爬取一些网站的同时，当然也可以在计算机上进行其他工作。
英文:
I would like to open multiple Selenium WebDrivers and process them in different threads. The question is how do Selenium Action class share keyboard/ mouse resources?
public class InterruptInput implements Runnable {
public static void main(String[] args) {
// two instances of action will run simultaneously
new Thread(new InterruptInput()).start();
new Thread(new InterruptInput()).start();
}
@Override
public void run() {
// not sure if the same can be replicated using ChromeDriver
WebDriver driver = new FirefoxDriver();
Actions act1 = new Actions(driver);
act1.moveToElement(searchBar)
.click()
.sendKeys("G")
.pause(1000)
.sendKeys("O")
.pause(1000)
.sendKeys("O")
.pause(1000)
.sendKeys("G")
.pause(1000)
.sendKeys("L")
.pause(1000)
.sendKeys("E")
.pause(1000)
.perform();
}
}
The observed result is:
- Two browsers will open. Each will type GOOGLE to the search bar in 7 seconds. There are no interference.
- If I manually click somewhere on the same page, and move the search bar out of focus, the input will be interrupted.
- If I manually open a new tab in one of the browsers, or switch to other apps in the operating system, GOOGLE will finish typing in the background.
How is this achieved? Does this mean I can open as many instances of WebDriver, and not worry about clogging up I/O. How is this different from Java's Robot class, which actively takes over keyboard and mouse control? For the reference, I am using Windows 10. Not sure if this is platform dependent.
The fundamental purpose being, I am writing a simple app that allows the user (me) to scrape some websites, while obviously allowing the user to do other work on the computer.
答案1
得分: 0
使用Actions类时，您不会使用真实的输入设备。您唯一分享的是代码中拥有的内容 - 一个对于每个线程都是新的WebDriver对象，以确保没有干扰。
因此，通过执行“鼠标移动”，您向WebDriver发送一个命令，该命令会将事件发送到浏览器，就像如果您使用真实的鼠标或键盘一样。真实的鼠标指针不会移动。
英文:
When you use Actions class you do not use real input devices. The only thing you share is what you have in your code - a WebDriver object that is new for each of your threads so that there is no interference.
So by performing a "mouse move" you send a command to webdriver that sends the event to a browser that it would receive if you would use the real mouse or keyboard. The real mouse pointer would not move.
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