driver.get(URL)、driver.navigate().to(URL)和driver.navigate().back()不起作用

Question

我正在尝试获取这个亚马逊页面(https://www.amazon.com/s?rh=n%3A565108%2Cp_72%3A4-&pf_rd_i=565108&pf_rd_p=b2e34a42-7eb2-50c2-8561-292e13c797df&pf_rd_r=E87FK4Z32CV7VPR4EZGP&pf_rd_s=merchandised-search-11&pf_rd_t=BROWSE&ref=Oct_s9_apbd_otopr_hd_bw_b2N0e_S)中列出的每个笔记本电脑的图像地址。

该方法应该单击每个正在出售的列表，使用driver.findElement(By.xpath(namesXpath)).getAttribute("src")抓取图像地址并将其保存到URL列表中。。但是，当我试图让驱动程序返回到所有笔记本电脑清单的页面，以便它可以继续通过for循环并获取其他清单的图像时，它给出了下面的错误。我尝试过driver.get(URL)、driver.navigate()、.to(URL)和driver.navigate().back()，但它们都不能将我带回上一页。

奇怪的是，在我的主方法中，driver.get("https://amazon.com")工作得很好，driver.findElement(by.xpath).click()也工作得很好。它就是在这个方法中崩溃的。

我是s=java和selenium的新手，所以我希望所有这些都是有意义的。任何帮助都将不胜感激。如果你需要更多的澄清，请告诉我

Exception in thread "main" org.openqa.selenium.NoSuchElementException: no such element: Unable to locate element: {"method":"xpath","selector":"//img [@id="detailImg"]"}
  (Session info: chrome=81.0.4044.138)
For documentation on this error, please visit: https://www.seleniumhq.org/exceptions/no_such_element.html
Build info: version: '3.141.59', revision: 'e82be7d358', time: '2018-11-14T08:25:48'
System info: host: 'DESKTOP-AU2FJQL', ip: '192.168.0.245', os.name: 'Windows 10', os.arch: 'amd64', os.version: '10.0', java.version: '1.8.0_251'
Driver info: org.openqa.selenium.chrome.ChromeDriver
Capabilities {acceptInsecureCerts: false, browserName: chrome, browserVersion: 81.0.4044.138, chrome: {chromedriverVersion: 81.0.4044.69 (6813546031a4b..., userDataDir: C:\Users\email\AppData\Loca...}, goog:chromeOptions: {debuggerAddress: localhost:50907}, javascriptEnabled: true, networkConnectionEnabled: false, pageLoadStrategy: normal, platform: WINDOWS, platformName: WINDOWS, proxy: Proxy(), setWindowRect: true, strictFileInteractability: false, timeouts: {implicit: 0, pageLoad: 300000, script: 30000}, unhandledPromptBehavior: dismiss and notify, webauthn:virtualAuthenticators: true}
Session ID: 1fe48e105aae883db4215eba6bb8c06b
*** Element info: {Using=xpath, value=//img [@id="detailImg"]}
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at org.openqa.selenium.remote.http.W3CHttpResponseCodec.createException(W3CHttpResponseCodec.java:187)
    at org.openqa.selenium.remote.http.W3CHttpResponseCodec.decode(W3CHttpResponseCodec.java:122)
    at org.openqa.selenium.remote.http.W3CHttpResponseCodec.decode(W3CHttpResponseCodec.java:49)
    at org.openqa.selenium.remote.HttpCommandExecutor.execute(HttpCommandExecutor.java:158)
    at org.openqa.selenium.remote.service.DriverCommandExecutor.execute(DriverCommandExecutor.java:83)
    at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:552)
    at org.openqa.selenium.remote.RemoteWebDriver.findElement(RemoteWebDriver.java:323)
    at org.openqa.selenium.remote.RemoteWebDriver.findElementByXPath(RemoteWebDriver.java:428)
    at org.openqa.selenium.By$ByXPath.findElement(By.java:353)
    at org.openqa.selenium.remote.RemoteWebDriver.findElement(RemoteWebDriver.java:315)
    at Executer.picsUpdateList(Executer.java:363)
    at Executer.main(Executer.java:163) 

public static String namesXpath = "//span[@data-a-strike=\"true\" or contains(@class,\"text-strike\")][.//text()]/preceding::span[@class][10]";

public static void picsUpdateList(WebDriver driver, List<String> URLs, List<BufferedImage> pics) throws IOException, InterruptedException
    {
        //list of deals on amazon page
        List<WebElement> deals = driver.findElements(By.xpath(namesXpath));

        //URL of each picture saved since this method was called
        List<String> freshURLs = new ArrayList<String>();

        //saves the URL of the page with all listings
        String pageURL = driver.getCurrentUrl();
        System.out.println(pageURL);

        //1. clicks on each deal from List<> deals
        //2. Grabs picture by xpath and saves the URL to both lists
        //3. 
        for(WebElement deal : deals)
        {
            deal.click();
            System.out.println("clicked on next deal");
            Thread.sleep(time);
            String url = driver.findElement(By.xpath("//img [@id=\"detailImg\"]")).getAttribute("src");
            URLs.add(url);
            freshURLs.add(url);
            System.out.println(url);
/// ERROR HERE//////////////////////////
            driver.navigate().back();
//////////////////////////////////////////
            System.out.println("back to page");
            Thread.sleep(time);
        }

        for(String url : freshURLs)
        {
            pics.add(ImageIO.read(new URL(url)));
        }

    }

Answer 1

我建议使用@id="landingImage"而不是@id="detailImg"。然后获取data-old-hires字段值以获取url。这与您从@id="detailImg"获取的源url相同(但正如我在前面的评论中提到的，在弹出元素之前，您可能需要首先悬停在屏幕上的图像上，我认为这就是错误的原因)。

您可以先尝试您的代码，并让我们知道这是否解决了您的问题。

以下是点击您提供的亚马逊页面url的交易示例。我在上面提到的细节下面用蓝色下划线。希望这能解决你的问题。

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