Because FIREFOX often updates the version silently in the background, sometimes SELENIUM cannot open the browser for no reason.
Recently, I found that it is very difficult to download the old version of FIREFOX. After searching for a long time, I finally found the FTP address of M company:
ftp.mozilla.org/pub/firefox/releases/
I hope it can help children's shoes who are in the same predicament as me. It is recommended to download version 45, and do not install modules that update silently.
https://github.com/mozilla/geckodriver/releases
System.setProperty("webdriver.gecko.driver", "d:\\eclipse\\geckodriver.exe");
WebDriver driver = new FirefoxDriver();
......