Selenium FindBy Amazon 搜索给出错误。 (java.lang.NullPointerException)

Question

有一个搜索 Class，我在其中创建了一个方法来进行亚马逊搜索，而 Main Class 调用了方法 searchFor() 但我一直收到错误

线程异常 "main" java.lang.NullPointerException

package Project1;

import org.openqa.selenium.WebElement;
import org.openqa.selenium.support.FindBy;

public class Search {

    @FindBy(id = "twotabsearchtextbox")
    WebElement search_box;


    public void searchFor(String content) {
        search_box.sendKeys(content);
        search_box.submit();
    }



}

这是主要的 Class

package Project1;


public class Main {

    public static void main(String[] args) {

        Search s1 = new Search();

        s1.searchFor("gaming laptop");

    }
}

Answer 1

请参考以下解决方案：

主要class

public class Main {

            public static void main(String[] args) {

            System.setProperty("webdriver.chrome.driver", "C:\New folder\chromedriver.exe");
            WebDriver driver = new ChromeDriver();
            driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);
            driver.get("Your url ");

            Search s1 = new Search(driver);
            s1.searchFor("gaming laptop");


    }
}

搜索class

import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.support.FindBy;
import org.openqa.selenium.support.PageFactory;

public class Search {

    @FindBy(id = "twotabsearchtextbox")
    WebElement search_box;

    WebDriver driver;
    public Search(WebDriver driver){

        this.driver = driver;
        PageFactory.initElements(driver, this);

    }
    public void searchFor(String content) {

        search_box.sendKeys(content);
        search_box.submit();
    }

}