Selenium 等待元素的方法，获取元素的方法封装

    ObjectMap 类和 objectMap.properties 文件将保存的元素成功的转化成了WebElement对象。但是还不够，接下来我们引入一下同步点的概念，就是在调用locator时，保证locator是显示在页面上的，webdriver中有个WebDriverWait对象。

    新建 WaitUtil 类，封装等待的各种方法，方便在测试过程中进行调用，类的具体代码如下：

package cn.hx.util;

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.support.ui.ExpectedCondition;
import org.openqa.selenium.support.ui.WebDriverWait;

public class WaitUtil {
    // 用于测试执行过程中暂停程序执行的休眠方法
    public static void sleep(long millisecond) {
        try {
            Thread.sleep(millisecond);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }

    // 显示等待页面元素出现的封装方法，参数为表现页面元素的By对象
    public static WebElement waitWebElement(WebDriver driver, final By by, int second) {
        WebElement element = null;
        WebDriverWait wait = new WebDriverWait(driver, second);
        try {
            // 创建一个新的ExpectedCondition接口，实现apply方法
            element = wait.until(new ExpectedCondition<WebElement>() {
                public WebElement apply(WebDriver d) {
                    return d.findElement(by);
                }
            });
        } catch (Exception e) {
            System.out.println(by.toString() + " is not exist until " + second);
        }
        return element;
    }

    // watiWebElement这个方法，返回的WebElement对象包括隐藏的，如果是隐藏的，那么在操作的时候，自然而然会报错，所以，我们得把隐藏的去掉，只显示displayed的元素对象
    public static boolean waitElementToBeDisplayed(WebDriver driver, final By by, int second) {
        boolean wait = false;
        WebElement element = driver.findElement(by);
        if (element == null)
            return wait;
        try {
            wait = new WebDriverWait(driver, second).until(new ExpectedCondition<Boolean>() {
                public Boolean apply(WebDriver d) {
                    return element.isDisplayed();
                }
            });
        } catch (Exception e) {
            System.out.println(element.toString() + " is not displayed");
        }
        return wait;
    }

    // 等待元素消失
    public static boolean waitElementToBeNoDisplayed(WebDriver driver, final By by, int second) {
        boolean wait = false;
        WebElement element = driver.findElement(by);
        if (element == null)
            return wait;
        try {
            wait = new WebDriverWait(driver, second).until(new ExpectedCondition<Boolean>() {
                public Boolean apply(WebDriver d) {
                    return !element.isDisplayed();
                }
            });
        } catch (Exception e) {
            System.out.println("Locator [" + element.toString() + "] is also displayed");
        }
        return wait;
    }

}

    获取页面元素类 GetWebElement ，可根据需求选择获取页面元素的方法：

package cn.hx.util;

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;

public class GetWebElement {

    // 指定页面元素定位表达式配置文件的绝对路径
    private ObjectMap objectMap = new ObjectMap("D:/MobileSpeedTestProj/objectMap.properties");
    private WebDriver driver;

    public GetWebElement(WebDriver driver) {
        super();
        this.driver = driver;
    }

    // 等待并判断页面元素出现后获取页面元素
    public WebElement getElement(String key, int seconds) throws Exception {
        By by = objectMap.getLocator(key);
        if (!(WaitUtil.waitElementToBeDisplayed(driver, by, seconds))) {
            System.out.println("Locator为" + key + "的元素不显示。");
        }
        return WaitUtil.waitWebElement(driver, by, seconds);
    }

    // 等待并获取页面元素，包括不显示的页面元素
    public WebElement getNotDisplayElement(String key,int seconds) throws Exception {
        By by = objectMap.getLocator(key);
        WebElement element = WaitUtil.waitWebElement(driver, by, seconds);
        return element;
    }
    
    // 获取页面元素By定位
    public By getElementBy(String key) throws Exception {
        By by = objectMap.getLocator(key);
        return by;
    }

}

    创建类 BeforeLineLoginPage ，用于实现获取页面 PageObject 对象，代码如下：

package cn.hx.pageObjects;

import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import cn.hx.util.GetWebElement;

public class BeforeLineLoginPage {
    private WebElement element;
    private WebDriver driver;

    public BeforeLineLoginPage(WebDriver driver) {
        super();
        this.driver = driver;
    }

    // new一个GetWebElement类的实例，并调用driver
    public GetWebElement getWebElement() {
        GetWebElement getWebElement = new GetWebElement(driver);
        return getWebElement;
    }

    // 获取首页【开始测速】按钮
    public WebElement startBtn() throws Exception {
        element = getWebElement().getElement("speedTest.beforeLineLogin.startBtn", 2000);
        return element;
    }

    // 获取用户须知页面【我同意】按钮
    public WebElement agreeBtn() throws Exception {
        element = getWebElement().getElement("speedTest.beforeLineLogin.agreeBtn", 2000);
        return element;
    }

}

 

 

    参考博客：http://www.cnblogs.com/zhangfei/p/3456159.html