Question

我是硒的关键字驱动方法的新手。我在NullPointerException

下面跑时得到ExecuteTest.java

文件夹结构

Folder structure

Object.txt

Object.txt

TestCase.xlsx

TestCase.xlsx

错误屏幕截图

Screenshot1
Screenshot2

添加调试屏幕截图 screenshot1 screenshot2 screenshot3

ReadGuru99Excel.java

import org.apache.poi.ss.usermodel.Sheet;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;

public class ReadGuru99ExcelFile {

    public Sheet readExcel (String filePath,String fileName, String sheetName)throws IOException{
        File file = new File(filePath+"\\"+fileName);
        FileInputStream inputStream = new FileInputStream(file);
        Workbook guru99Workbook = null;

        String fileExtensionName = fileName.substring(fileName.indexOf("."));

        if(fileExtensionName.equals(".xlsx")){
            guru99Workbook = new XSSFWorkbook(inputStream);
        } else if(fileExtensionName.equals(".xls")) {
            guru99Workbook = new HSSFWorkbook(inputStream);
        }
        Sheet guru99Sheet =guru99Workbook.getSheet(sheetName);
        return guru99Sheet;
    }
}

ReadObject.Java

package operation;
import java.util.Properties;
import java.io.IOException;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.File;

public class ReadObject {   

    Properties p = new Properties();

    public Properties getObjectRepository()throws IOException{

        InputStream stream = new FileInputStream(new File (System.getProperty("user.dir")+"\\src\\objects\\object.txt"));

        p.load(stream);
        return p;
    }
}

UIOperation.java

package operation;
import org.openqa.selenium.WebDriver;
import java.util.Properties;
import org.openqa.selenium.By;

public class UIOperation {
    WebDriver driver ;

    public UIOperation(WebDriver driver){
        this.driver = driver; 
    }

    public void perform(Properties p, String operation, String objectName, String objectType, String value) throws Exception{
        System.out.println("");
        switch(operation.toUpperCase()){
            case "CLICK":
                driver.findElement(this.getObject(p, objectName, objectType)).click();
                break;
            case "SETTEXT":
                driver.findElement(this.getObject(p, objectName, objectType)).sendKeys(value);
                break;
            case "GOTOURL":
                driver.get(p.getProperty(value));
                break;
            case "GETTEXT":
                driver.findElement(this.getObject(p, objectName, objectType)).getText();
                break;
            default:
                break;
       }
   }
   private By getObject(Properties p, String objectName, String objectType) throws Exception{
      if(objectType.equalsIgnoreCase("XPATH")){
          return By.xpath(p.getProperty(objectName));
      }else if(objectType.equalsIgnoreCase("CLASSNAME")){
          return By.className(p.getProperty(objectName));
      }else if(objectType.equalsIgnoreCase("NAME")){
          return By.name(p.getProperty(objectName));
      }else if(objectType.equalsIgnoreCase("CSS")){
          return By.cssSelector(p.getProperty(objectName));
      }else if(objectType.equalsIgnoreCase("LINK")){
          return By.linkText(p.getProperty(objectName));
      }else if(objectType.equalsIgnoreCase("PARTIALLINK")){
          return By.partialLinkText(p.getProperty(objectName));
      }else{
          throw new Exception("Wrong object type");
      }
   }
}

ExecuteTest.java

package testcases;
import java.util.Properties;
import operation.ReadObject;
import org.testng.annotations.Test;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.chrome.ChromeDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.firefox.MarionetteDriver;
import org.openqa.selenium.remote.DesiredCapabilities;
import operation.UIOperation;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Row;
import excelExportAndFileIO.ReadGuru99ExcelFile;

public class ExecuteTest {

    @Test
    public void testLogin()throws Exception{
        /**
         * System.setProperty("webdriver.gecko.driver", "E:\\Selenium-2017\\geckodriver-v0.18.0-win64\\geckodriver.exe");
         * //Now you can Initialize marionette driver to launch firefox
         * DesiredCapabilities capabilities = DesiredCapabilities.firefox();
         * capabilities.setCapability("marionette", true);
         * WebDriver driver = new RemoteWebdriver(capabilities); 
         *
         * WebDriver webdriver = new FirefoxDriver();
         **/
        WebDriver driver;
        System.setProperty("webdriver.chrome.driver","E:\\Selenium-2017\\chromedriver_win32\\chromedriver.exe");
        driver = new ChromeDriver();

        ReadGuru99ExcelFile file = new ReadGuru99ExcelFile();
        ReadObject object = new ReadObject();
        Properties allObjects = object.getObjectRepository();
        UIOperation operation = new UIOperation(driver);
        Sheet guru99Sheet = file.readExcel(System.getProperty("user.dir")+"\\test-output","TestCase.xlsx","KeywordFramework");
        int rowCount =guru99Sheet.getLastRowNum()-guru99Sheet.getFirstRowNum();

        System.out.println("first step clear");

        for(int i = 0;i<rowCount+1; i++){
            Row row  =guru99Sheet.getRow(i);
            System.out.println("2nd clear");
            if(row.getCell(0).toString().length()==0){
                System.out.println("4nd clear");
                System.out.println(row.getCell(1).toString()+"-----"+row.getCell(2).toString()+"----"+row.getCell(3).toString()+"---"+row.getCell(4).toString());
                System.out.println("3rd clear");
                operation.perform(allObjects, row.getCell(1).toString(), row.getCell(2).toString(), row.getCell(3).toString(), row.getCell(4).toString());  

            } else
                System.out.println("New Testcase->" + row.getCell(0).toString()+"Started");
            System.out.println("testerassumption");

        }
    }
}

Answer 1

首先，请查看关于NullPointerException以及如何解决此问题的精彩post。

在您的情况下，堆栈跟踪将NullPointerException指向ExecuteTest.java中代码的第49行，该代码指向此行代码

 operation.perform(allObjects, row.getCell(1).toString(), row.getCell(2).toString(), row.getCell(3).toString(), row.getCell(4).toString());

这里的问题是，当您尝试将getCell()方法中的单元格内容转换为String时，如果单元格中没有任何内容，那么总会有{{ 1}}。

您可以在每个单元格之前进行NullPointerException检查，也可以为每个!= null方法添加" "，例如

toString()

关键字驱动框架 - 获取错误java.lang.NullPointerException

1 个答案: