使用頁面對象的好處是：

當頁面元素的位置發生變化時，

我們只需要去修改id或者xpath，

而不用去修改測試用例。

import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.support.FindBy;
import org.openqa.selenium.support.PageFactory;
import org.testng.Assert;
import org.testng.Reporter;
import org.testng.annotations.AfterMethod;
import org.testng.annotations.BeforeMethod;
import org.testng.annotations.Test;

public class TestNG {
    private WebDriver driver;

    @FindBy(xpath = ".//*[@id=‘kw‘]")
    private WebElement inputBox;
    //輸入框

    @FindBy(xpath = ".//*[@id=‘su‘]")
    private WebElement searchButton;
    //搜索按鈕

    @BeforeMethod
    public void beforeMethod() throws InterruptedException {
        System.setProperty("webdriver.firefox.marionette",
                "src/main/resourcec/geckodriver.exe");
        String baiduHomePage;
        baiduHomePage = "https://www.baidu.com/";

        driver = new FirefoxDriver();
        PageFactory.initElements(driver, this);
        //構造函數，初始化PageFactory對象
        driver.manage().window().maximize();
        driver.get(baiduHomePage);
        Thread.sleep(2000);
        Assert.assertEquals(driver.getTitle(), "百度一下，你就知道");
    }

    @Test
    public void testNG() throws InterruptedException {
        inputBox.clear();
        inputBox.sendKeys("Selenium");

        searchButton.click();
        Thread.sleep(3000);

        Reporter.log("搜索Selenium的測試用例");
        Assert.assertEquals(driver.getTitle(), "Selenium_百度搜索");
    }

    @AfterMethod
    public void afterMethod(){
        driver.close();
        driver.quit();
    }

}

Selenium PageFactory頁面對象