范围报告3-添加screeenshot错误-Selenium，Java

Question

测试失败时，我会将屏幕截图添加到侦听器中，以将其添加到报告中。我已经在utils中编写了takeScreenshot方法并返回了路径。

但是当它到达File scshot行时会抛出Null指针异常

//Screenshot method in utils class
    public static String takeScreenshot() throws Exception {

        File scshot= ((TakesScreenshot)driver).getScreenshotAs(OutputType.FILE);
        String path = System.getProperty("user.dir")+ "/Reports/Screenshots/"+ System.currentTimeMillis()+".png";

        System.out.println(path);
        FileUtils.copyFile(scshot, new File(path));

        return path;
    }

** //失败

listener**
public void onTestFailure(ITestResult result) {
        // TODO Auto-generated method stub
        String takeScreenshot = null;
        System.out.println(result.getMethod().getMethodName() +" Test Case FAILED !");
        try {

            takeScreenshot = utils.takeScreenshot();
        } catch (IOException e) {
            // TODO: handle exception
    e.printStackTrace();    
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        try {
            test.get().addScreenCaptureFromPath(takeScreenshot);
        } catch (IOException e) {
            // TODO: handle exception
            e.printStackTrace();
        }

    }

<-------- **************** ----------> 输出：

VerifyTitleTest Test Case FAILED !
java.lang.NullPointerException
    at ExtentReport.utils.takeScreenshot(utils.java:21)
    TestNgListeners.TestNGlisteners.onTestFailure(TestNGlisteners.java:56)
    at org.testng.internal.TestListenerHelper.runTestListeners(TestListenerHelper.java:67)
    at org.testng.internal.Invoker.runTestListeners(Invoker.java:1389)
    at org.testng.internal.Invoker.invokeMethod(Invoker.java:636)
    at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:719)
    at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:989)
    at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:125)
    at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:109)
    at org.testng.TestRunner.privateRun(TestRunner.java:648)
    at org.testng.TestRunner.run(TestRunner.java:505)
    at org.testng