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The path to the driver executable must be set by the webdriver.gecko.driver system property

报这个错,是因为你使用了selenium3+Firefox。在selenium3中,使用Firefox,需要添加驱动。

您可以从Github上下载驱动程序下载网址-  https://github.com/mozilla/geckodriver/releases/tag/v0.9.0

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在代码中加入

System.setProperty("webdriver.firefox.marionette","C:\\Program Files (x86)\\Mozilla Firefox\\geckodriver.exe");
WebDriver driver=new FirefoxDriver();

C:\\Program Files (x86)\\Mozilla Firefox\\geckodriver.exe是驱动放置的位置

现在,您可以运行程序,你会得到期望的输出。

The path to the driver executable must be set by the webdriver.gecko.driver system property