java - 使用java的selenium代码中的空指针异常

Question

import org.testng.annotations.BeforeClass;
import org.testng.annotations.Test;

import com.thoughtworks.selenium.DefaultSelenium;
import com.thoughtworks.selenium.Selenium;

public class RedBus {
    Selenium selenium;

    @BeforeClass
    public void base()
    {
    Selenium selenium = new DefaultSelenium("localhost",4444,"*firefox","http://www.redbus.in");
    selenium.start();
    selenium.windowMaximize();
    selenium.open("/"); 
    selenium.waitForPageToLoad("10000");
    }       

    @Test
    public void domain() throws InterruptedException
    {           
            selenium.type("//input[@id='DDLSource']","hyde");
            Thread.sleep(5000);

            selenium.waitForPageToLoad("10000");
        if(selenium.isTextPresent("//dt[@value='Hyderabad']"))
        {
            selenium.click("//dt[@value='Hyderabad']");

        }
        else{
            System.out.println("ele not found");
        }
    /*  
        selenium.type("//input[@id='DDLDestination']","pune");

        selenium.click("//img[@alt='Select your date of journey']");
        */



    }

}

Answer 1

虽然您在何处获得 NullPointerException 并不明显，但我怀疑您需要更改以下行:

Selenium selenium = new DefaultSelenium("localhost",4444,"*firefox","http://www.redbus.in");

到

selenium = new DefaultSelenium("localhost",4444,"*firefox","http://www.redbus.in");

目前，您正在您的设置方法中初始化一个新的 Selenium 对象，该对象仅在您的 base 方法范围内，而不是您的类级 Selenium 变量。