1.Using sendKeys.Keys method
driver.get("https://accounts.google.com/SignUp");
driver.findElement(By.id("firstname-placeholder")).sendKeys(Keys.F5);
2.Using navigate.refresh() method
driver.get("https://accounts.google.com/SignUp");
driver.navigate().refresh();
3.Using navigate.to() method
driver.get("https://accounts.google.com/SignUp");
driver.navigate().to(driver.getCurrentUrl());
4.Using get() method
driver.get("https://accounts.google.com/SignUp");
driver.get(driver.getCurrentUrl());
5.Using sendKeys() method
driver.get("https://accounts.google.com/SignUp");
driver.findElement(By.id("firstname-placeholder")).sendKeys("\uE035");
原文：http://www.cnblogs.com/MasterMonkInTemple/p/4097512.html