我有一个名为Start.java的主程序，它被导出为jar文件。然后将执行此Jar文件并从Excel工作表中检索数据。 Start.jar的编码如下：
public class Start {
public static int count;
public static String jar_filepath;
public static String testability;
public static String tc_name;
public static String url;
public static String test_data_filepath;
public static String tc_result_filepath;
public static String date_time = new SimpleDateFormat
("ddMMyyyy_HHmm'.xlsx'").format(new Date());`
public static void main(String[] args) throws IOException, Throwable{
//Read TestConfig.xlsx for checking which test case to be test
FileInputStream StartInput = new
FileInputStream("c:\\TestAutomation\\TestConfigWithMacro.xlsm");
XSSFWorkbook StartInputWB = new XSSFWorkbook(StartInput);
XSSFSheet sheet = StartInputWB.getSheet("Config");
for(count = 1;count<=sheet.getLastRowNum();count++){
System.out.println(count);
XSSFRow row = sheet.getRow(count);
testability = row.getCell(0).toString();
tc_name = row.getCell(1).toString();
jar_filepath = row.getCell(2).toString();
url = row.getCell(3).toString();
test_data_filepath = row.getCell(4).toString();
tc_result_filepath = row.getCell(5).toString()+tc_name+"_"+date_time;
System.out.println("Test Case Name : " + tc_name);
if(testability.equals("Y")||testability.equals("y)")){
System.out.println("Test Case Name : " + tc_name);
//String command = "cmd /s/k start java -jar " + jar_filepath;
Process p = Runtime.getRuntime().exec("cmd /c start cmd /k java -jar "+jar_filepath);
Thread.sleep(50000);
执行Start.jar将调用称为LoginCaptchaChrome.jar的测试用例文件，编码如下：
public class LoginCaptchaChrome {
public static void main(String[] args) throws IOException,
InterruptedException{System.setProperty("webdriver.chrome.driver", "C:\\Users\\user1\\Desktop\\work\\chromedriver_win32\\chromedriver.exe");
//The following creates test result excel sheet
//System.out.println(Start.tc_result_filepath);
FileOutputStream fos = new FileOutputStream(Start.tc_result_filepath);
//FileOutputStream fos = new FileOutputStream("c:\\Test Data\\write.xlsx");
XSSFWorkbook workbook = new XSSFWorkbook();
XSSFSheet sheet1 = workbook.createSheet("TS1");
CellStyle style = workbook.createCellStyle();
XSSFFont bold = workbook.createFont();
bold.setBoldweight(XSSFFont.BOLDWEIGHT_BOLD);
style.setFont(bold);
style.setBorderBottom(XSSFCellStyle.BORDER_THIN);
style.setBorderLeft(XSSFCellStyle.BORDER_THIN);
style.setBorderRight(XSSFCellStyle.BORDER_THIN);
style.setBorderTop(XSSFCellStyle.BORDER_THIN);
int a = 0;
Row row = sheet1.createRow(a);
Cell TC = row.createCell(0);
TC.setCellValue("No.");
TC.setCellStyle(style);
sheet1.autoSizeColumn(0);
Cell Expected = row.createCell(1);
Expected.setCellValue("Expected Result");
Expected.setCellStyle(style);
sheet1.autoSizeColumn(1);
Cell Actual = row.createCell(2);
Actual.setCellValue("Actual Result");
Actual.setCellStyle(style);
sheet1.autoSizeColumn(2);
workbook.write(fos);
fos.close();
workbook.close();
credentials.getFile();
}
public static void runTest(String string0, String string, String string1) throws InterruptedException, IOException{
WebDriver login = new ChromeDriver();
System.out.println(login);
login.get(Start.url);
//login.get("https://2015.qa.int.www.mol.com/");
login.findElement(By.xpath("//*[@id='lorem']/img")).isDisplayed();
login.findElement(By.xpath("//*[@id='popupfoot']/a/i")).click();
login.findElement(By.linkText("Log in")).click();
Thread.sleep(2000);
login.findElement(By.xpath("//*[@id='EmailAddress']")).sendKeys(credentials.username);
login.findElement(By.xpath("//*[@id='Password']")).sendKeys(credentials.password);
Thread.sleep(2000);
login.findElement(By.xpath("//*[@id='LoginForm']/footer[1]/table/tbody/tr/td[2]/button")).click();
Thread.sleep(2000);
if(login.getPageSource().contains("The email or password you entered is incorrect. Please try again.")){
login.get(Start.url);
login.quit();
}
else{
login.findElement(By.xpath("//*[@id='myModalEligibleToIncreaseWalletLimit']/div/div/div[3]/a")).click();
String i = login.findElement(By.xpath("//*[@id='AccountSettingsForm']/fieldset/section[2]/div/label")).getText();
//The following populate test result
if(i.equals("Please fill in for account security enquiries and account termination request.")){
FileInputStream input_pass = new FileInputStream(Start.tc_result_filepath);
XSSFWorkbook wb_pass = new XSSFWorkbook(input_pass);
XSSFSheet sheet2 = wb_pass.getSheet("TS1");
CellStyle style_pass = wb_pass.createCellStyle();
style_pass.setBorderBottom(XSSFCellStyle.BORDER_THIN);
style_pass.setBorderLeft(XSSFCellStyle.BORDER_THIN);
style_pass.setBorderRight(XSSFCellStyle.BORDER_THIN);
style_pass.setBorderTop(XSSFCellStyle.BORDER_THIN);
int b = credentials.count;
Row row_Pass = sheet2.createRow(b);
Cell TC_Pass = row_Pass.createCell(0);
TC_Pass.setCellValue(credentials.tc);
TC_Pass.setCellStyle(style_pass);
Cell Expected_Pass = row_Pass.createCell(1);
Expected_Pass.setCellValue(i);
sheet2.autoSizeColumn(b);
Expected_Pass.setCellStyle(style_pass);
Cell Result = row_Pass.createCell(2);
Result.setCellValue("PASS");
Result.setCellStyle(style_pass);
FileOutputStream write_pass = new FileOutputStream(Start.tc_result_filepath);
//FileOutputStream write_pass = new FileOutputStream("c:\\Test Data\\write.xlsx");
wb_pass.write(write_pass);
write_pass.close();
wb_pass.close();
}
else{
FileInputStream input_fail = new FileInputStream(Start.tc_result_filepath);
//FileInputStream input_fail = new FileInputStream("c:\\Test Data\\write.xlsx");
XSSFWorkbook wb_fail = new XSSFWorkbook(input_fail);
XSSFSheet sheet2 = wb_fail.getSheet("TS1");
CellStyle style_fail = wb_fail.createCellStyle();
style_fail.setBorderBottom(XSSFCellStyle.BORDER_THIN);
style_fail.setBorderLeft(XSSFCellStyle.BORDER_THIN);
style_fail.setBorderRight(XSSFCellStyle.BORDER_THIN);
style_fail.setBorderTop(XSSFCellStyle.BORDER_THIN);
int b = credentials.count;
Row row_Fail = sheet2.createRow(b);
Cell TC_Fail = row_Fail.createCell(0);
TC_Fail.setCellValue(credentials.tc);
TC_Fail.setCellStyle(style_fail);
Cell Expected_Fail = row_Fail.createCell(1);
Expected_Fail.setCellValue(i);
sheet2.autoSizeColumn(b);
Expected_Fail.setCellStyle(style_fail);
Cell Result_Fail = row_Fail.createCell(2);
Result_Fail.setCellValue("FAIL");
XSSFFont font = wb_fail.createFont();
font.setColor(IndexedColors.RED.getIndex());
style_fail.setFont(font);
Result_Fail.setCellStyle(style_fail);
FileOutputStream write_fail = new FileOutputStream(Start.tc_result_filepath);
//FileOutputStream write_fail = new FileOutputStream("c:\\Test Data\\write.xlsx");
wb_fail.write(write_fail);
write_fail.close();
wb_fail.close();
}
login.quit();
System.out.println("Test end");
}
}
}
当我通过执行start.jar运行时，cmd窗口立即打开并关闭，尽管我使用cmd /c start cmd /k ....，我的代码才停止执行。
接下来我通过Eclipse执行Start.java来进行调试。这次，cmd窗口被打开，但显示以下内容
Exception in thread "main" java.lang.NullPointerException
at java.io.FileOutputStream.<init>(Unknown Source)
at java.io.FileOutputStream.<init>(Unknown Source)
at LoginCaptchaChrome.main(LoginCaptchaChrome.java:46)
第46行引用这行代码：
FileInputStream input_pass = new FileInputStream(Start.tc_result_filepath);
在Eclipse调试模式下，我实际上可以看到Start.tc_result_path正在填充路径位置，但我不确定为什么JVM会抛出NullPointerException。