如何使一个程序，它遍历所有Instagram上保存的照片

Question

我在创建从页的“拯救”省面积的Instagram照片程序的过程。有2个要素：

• “chevrones”，它允许你切换多出版物中的照片;
• 右箭头”，让您移动到下一个发布。

我想箱子程序至极去throught所有保存的照片。如果有一个shevron程序应该循环throught这多个照片的出版物中的所有照片（上shervor点击可用时）。如果没有shevron时可用的程序应该移动到下一个保存的照片（点击下箭头）。

我的问题是：如何写1正常“IF条款”）首次环多刊物内，2）然后（当所有的多酒吧里面的照片将结束）到下一个发布。

到目前为止，我下面的代码：

import org.openqa.selenium.WebDriver;
import org.openqa.selenium.chrome.ChromeDriver;
import org.openqa.selenium.support.ui.ExpectedConditions;
import org.openqa.selenium.support.ui.WebDriverWait;
import org.openqa.selenium.By;
import org.openqa.selenium.WebElement;

import java.util.List;

public class TestSelenium {
    public static void main(String[] args){
        WebElement img;
        String src;
        int i =0;

// Set webdriver option
        System.setProperty("webdriver.chrome.driver", "C:\\Program Files (x86)\\Common Files\\Oracle\\Java\\Webdrivers\\chromedriver.exe");
        WebDriver driver = new ChromeDriver();
        driver.get("https://www.instagram.com/accounts/login/");
// Set waits
        WebDriverWait wait = new WebDriverWait(driver, 5);

// Write down the login
        wait.until(ExpectedConditions.visibilityOfElementLocated(By.cssSelector("input[name='username']"))).sendKeys("%%MY_INSTA_LOGGIN%%");
// Write down the password
        wait.until(ExpectedConditions.visibilityOfElementLocated(By.cssSelector("input[name='password']"))).sendKeys("%%MY_INSTA_PASSWORD%%");
// Click on the Signin button
        wait.until(ExpectedConditions.visibilityOfElementLocated(By.cssSelector("button[type='submit']"))).click();

// Go to the saved page
        wait.until(ExpectedConditions.visibilityOfElementLocated(By.cssSelector("div[class='SKguc']"))).click();
        driver.get("https://www.instagram.com/aleksandrqa/saved/");

// Click on the first element
        wait.until(ExpectedConditions.visibilityOfElementLocated(By.cssSelector("div[class='eLAPa']"))).click();

            // Click on the next chevron
            wait.until(ExpectedConditions.visibilityOfElementLocated(By.cssSelector("a[class='SWk3c  Zk-Zb coreSpriteRightChevron']"))).click();

            // Click on the next arrow
            wait.until(ExpectedConditions.visibilityOfElementLocated(By.cssSelector("a[class='HBoOv coreSpriteRightPaginationArrow']"))).click();

// TODO
// Save all photos URLs

    }
}

Answer 1

您可以识别下一个图像使用下面的XPath >箭头：

String xpath = "//div[contains(@class, 'RightChevron')]";

如果你到最后的图像则是因为图像>箭头不存在最后/单个图像上面的XPath将不会返回任何匹配。

要检查定位器是否存在没有处理任何异常，您可以使用如下的方法findElements()：

List<WebElement> imageArrow = driver.findElements(By.xpath(xpath));
if(imageArrow.size() > 0) {
    System.out.println("=> The image arrow is present...");
    // Perform some action here
} else {
    System.out.println("=> The image arrow is not present...");
}

如果列表大小大于零则有一个箭头，否则不能，所以下面的代码将遍历，直到大小大于零，并单击图像箭头。

boolean isThereAnArrow = true;
while(isThereAnArrow) {
    final String xpath = "//div[contains(@class, 'RightChevron')]";
    List<WebElement> imageArrow = driver.findElements(By.xpath(xpath));
    if(imageArrow.size() > 0) {
        System.out.println("=> The image arrow is present...");
        imageArrow.get(0).click(); // Clicking on the image arrow
    } else {
        System.out.println("=> The image arrow is not present...");
        isThereAnArrow = false; // If there is no match then it will help us to break the loop
    }

}

同样像上面，你可以检查下一个>箭头的职位。下面是点击了图片>箭头如果它的存在，或将在接下来的文章中按钮，直到有一些帖子点击整个代码。

boolean isThereNextPostArrow = true;
while(isThereNextPostArrow) {
    // Checks for the next '>' image arrow, if not then will break the loop
    // ---------------------------------------------------------------------------
    boolean isThereAnArrow = true;
    while(isThereAnArrow) {
        final String xpath = "//div[contains(@class, 'RightChevron')]";
        List<WebElement> imageArrow = driver.findElements(By.xpath(xpath));
        if(imageArrow.size() > 0) {
            System.out.println("=> The image arrow is present...");

            // Do something here

            imageArrow.get(0).click(); // Clicking on the image arrow
        } else {
            System.out.println("=> The image arrow is not present...");
            isThereAnArrow = false; // If there is no match then it will help us to break the loop
        }
    }
    // ---------------------------------------------------------------------------
    // Checks for the next '>' post arrow, if not then will break the loop
    List<WebElement> nextPost = driver.findElements(By.xpath("//a[contains(@class, 'PaginationArrow')]"));
    if(nextPost.size() > 0) {
        System.out.println("=> The next post arrow is there...");
        nextPost.get(0).click(); // Clicking on the next post
    } else {
        System.out.println("=> The next post arrow is not there...");
        isThereNextPostArrow = false; // If there is no match then it will help us to break the outer loop
    }
}

我希望它可以帮助...