How to extract html through Javascript executor?

问题

import org.openqa.selenium.chrome.ChromeDriver;
import org.openqa.selenium.JavascriptExecutor;
import org.openqa.selenium.WebDriver;       

public class oo {
   public static void main(String[] args) {

       System.setProperty("webdriver.chrome.driver","D:\\Java\\Lib\\chromedriver.exe");
      WebDriver driver = new ChromeDriver();         
      driver.navigate().to("https://google.com");

      JavascriptExecutor js = (JavascriptExecutor) driver;  
      Object s = js.executeScript("return document.body.innerHTML;",null).toString();

      System.out.println(s);
      driver.close();
   }
}

Above code returns nullPointerException.

Exception in thread "main" java.lang.NullPointerException at java.util.Arrays.stream(Unknown Source) at java.util.stream.Stream.of(Unknown Source) at org.openqa.selenium.remote.RemoteWebDriver.executeScript(RemoteWebDriver.java:484) at oo.main(oo.java:25)

When I remove optional object parameter, it goes compilation error.

Code:

  JavascriptExecutor js = (JavascriptExecutor) driver;  
  Object s = js.executeScript("return document.body.innerHTML;").toString();

Error:

Exception in thread "main" java.lang.Error: Unresolved compilation problem:     The method executeScript(String, Object[]) in the type JavascriptExecutor is not applicable for the arguments (String)

Using Selenium-server-standalone-3.141.59.jar

回答1:

To extract and print the Page Source through JavascriptExecutor you can use the following (Java based) solution:

• Syntax:

  String page_source = ((JavascriptExecutor)driver).executeScript("return document.documentElement.innerHTML;").toString();
  System.out.println(page_source);
  

Note: You need to induce a waiter for the page to load completely before extracting the Page Source.

来源：https://stackoverflow.com/questions/53411703/how-to-extract-html-through-javascript-executor