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public class ExcelSheetController extends HttpServlet implements ServletContextListener
{
static File appHome;
static File customerDataFile;
@Override
public void init(ServletConfig config) throws ServletException{
// TODO Auto-generated method stub
/* I getting the Apache tomcat folder of web-app and also adding the context path which is written in web.xml folder{ <context-param>
<param-name>MyAppHome</param-name>
<param-value>com/excelsave/</param-value>
</context-param>} */
String filePath = "C:/apache-tomcat-7.0.5/webapps"+getServletContext().getRealPath("MyAppHome") + File.separator+"udaanmasterdatabase.xls";
System.out.println(filePath+" GGGGGGGGGG");
appHome = new File(filePath);
File customerDataFile = new File(appHome, "udaanmasterdatabase.xls");
}
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// TODO Auto-generated method stub
HttpSession session = req.getSession(false);
if(session!=null)
{
try {
int rownum = 0;
//Create a blank sheet
HSSFWorkbook workbook = new HSSFWorkbook();
HSSFSheet sheet = workbook.createSheet("Sample sheet");
shadeAlt(sheet);
HSSFCellStyle my_style = workbook.createCellStyle();
/* We will now specify a background cell color */
my_style.setFillPattern(HSSFCellStyle.FINE_DOTS);
my_style.setFillForegroundColor(new HSSFColor.BLACK().getIndex());
my_style.setFillBackgroundColor(new HSSFColor.SKY_BLUE().getIndex());
Row row = sheet.createRow(1);
for(int i=0;i<10;i++)
{
Cell cell = row.createCell(i);
cell.setCellStyle(my_style);
switch (i) {
case 3:
cell.setCellValue("Drive Detail");
break;
default:
cell.setCellValue("");
}
}
/* row.createCell(10).setCellValue("Selection of Student Detail");*/
HSSFCellStyle my_style1 = workbook.createCellStyle();
my_style1.setFillPattern(HSSFCellStyle.FINE_DOTS);
my_style1.setFillForegroundColor(new HSSFColor.BLACK().getIndex());
my_style1.setFillBackgroundColor(new HSSFColor.GREEN().getIndex());
Cell cell1 = null;
/* cell1 = row.createCell(10);
cell1.setCellValue("Selection of Student Detail");*/
for(int i=10;i<85;i++)
{
cell1 = row.createCell(i);
cell1.setCellStyle(my_style1);
switch (i) {
case 10:
cell1.setCellValue("Selection of Student Detail");
break;
default:
cell1.setCellValue("");
break;
}
}
HSSFCellStyle my_style2 = workbook.createCellStyle();
my_style2.setFillPattern(HSSFCellStyle.FINE_DOTS);
my_style2.setFillForegroundColor(new HSSFColor.BLACK().getIndex());
my_style2.setFillBackgroundColor(new HSSFColor.BLUE_GREY().getIndex());
Row row1 = sheet.createRow(2);
for(int i=0;i<86;i++)
{
Cell cell2 = row1.createCell(i);
cell2.setCellStyle(my_style2);
switch (i) {
case 0:
cell2.setCellValue("Sno");
break;
case 2:
cell2.setCellValue("Drive Location");
break;
case 4 :
cell2.setCellValue("Date of Interview");
break;
case 6:
cell2.setCellValue("Selected By");
break;
case 8:
cell2.setCellValue("Mode of Selection");
break;
case 10:
cell2.setCellValue("Student Id");
break;
case 12:
cell2.setCellValue("Student first Name");
break;
case 14:
cell2.setCellValue("Student Last Name");
break;
case 16:
cell2.setCellValue("Qualification");
break;
case 18:
cell2.setCellValue("Course Applied");
break;
case 20:
cell2.setCellValue("Joining Course");
break;
case 22:
cell2.setCellValue("Ending Course");
break;
case 25:
cell2.setCellValue("Place of Training");
break;
case 30:
cell2.setCellValue("Bank Account Number");
break;
case 34:
cell2.setCellValue("Travel Expense");
break;
case 38:
cell2.setCellValue("Medical Insurance Number");
break;
case 42:
cell2.setCellValue("Medical Insurance Transfer from");
break;
case 46:
cell2.setCellValue("Medical Insurance from");
break;
case 50:
cell2.setCellValue("Medical Insurance to");
break;
case 54:
cell2.setCellValue("Reason Leaving of Institue");
break;
case 58:
cell2.setCellValue("Placement Status");
break;
case 62:
cell2.setCellValue("Appointment Letter Received");
break;
case 66:
cell2.setCellValue("First Month Salary Status");
break;
case 70:
cell2.setCellValue("Second Month Salary Status");
break;
case 74:
cell2.setCellValue("Third Month Salary Status");
break;
case 78:
cell2.setCellValue("Book Returns Leaving Institute");
break;
default:
cell2.setCellValue("");
break;
}
}
Row row2 = sheet.createRow(3);
row2.createCell(0).setCellValue(1);
row2.createCell(2).setCellValue(lgbean.getDrivelocation());
row2.createCell(4).setCellValue(datinter);
row2.createCell(6).setCellValue(lgbean.getSelectprocedure());
row2.createCell(8).setCellValue(lgbean.getModeselection());
row2.createCell(10).setCellValue(lgbean.getStudid());
row2.createCell(12).setCellValue(lgbean.getFirstname());
row2.createCell(14).setCellValue(lgbean.getLastname());
row2.createCell(16).setCellValue(lgbean.getQualification());
row2.createCell(18).setCellValue(lgbean.getCourseoffered());
row2.createCell(20).setCellValue(join_date);
row2.createCell(22).setCellValue(end_date);
row2.createCell(25).setCellValue(lgbean.getPlacetraining());
row2.createCell(30).setCellValue(lgbean.getBankaccntno());
row2.createCell(34).setCellValue(lgbean.getTravelexpense());
row2.createCell(38).setCellValue(lgbean.getMedicalinsuranceno());
row2.createCell(42).setCellValue(lgbean.getTransferto());
row2.createCell(46).setCellValue(medicaldatfrom);
row2.createCell(50).setCellValue(medicaldatto);
row2.createCell(54).setCellValue(lgbean.getLeavinghostel());
row2.createCell(58).setCellValue(lgbean.getPlacementstatus());
row2.createCell(62).setCellValue(lgbean.getAppoint_letter());
row2.createCell(66).setCellValue(lgbean.getSelectmonth1());
row2.createCell(70).setCellValue(lgbean.getSelectmonth2());
row2.createCell(74).setCellValue(lgbean.getSelectmonth3());
row2.createCell(78).setCellValue(lgbean.getBook_returns());
try {
// file save in the com/excelsave folder in my web-app
File customerDataFile = new File(appHome, "udaanmasterdatabase.xls");
FileOutputStream out =
new FileOutputStream(customerDataFile);
workbook.write(out);
out.close();
System.out.println("Excel written successfully..");
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
RequestDispatcher rd = req.getRequestDispatcher("index.do");
rd.forward(req, resp);
}
else
{
resp.sendRedirect("logOut.do");
}
}
private void shadeAlt(HSSFSheet sheet) {
// TODO Auto-generated method stub
SheetConditionalFormatting sheetCF = sheet.getSheetConditionalFormatting();
// Condition 1: Formula Is =A2=A1 (White Font)
ConditionalFormattingRule rule1 = sheetCF.createConditionalFormattingRule("MOD(ROW(),2)");
PatternFormatting fill1 = rule1.createPatternFormatting();
fill1.setFillBackgroundColor(IndexedColors.LIGHT_GREEN.index);
fill1.setFillPattern(PatternFormatting.SOLID_FOREGROUND);
CellRangeAddress[] regions = {
CellRangeAddress.valueOf("A1:GG1000")
};
sheetCF.addConditionalFormatting(regions, rule1);
/* sheet.createRow(0).createCell(1).setCellValue("Shade Alternating Rows");*/
sheet.createRow(1).createCell(1).setCellValue("Condition: Formula Is =MOD(ROW(),2) (Light Green Fill)");
}
@Override
public void contextDestroyed(ServletContextEvent arg0) {
// TODO Auto-generated method stub
}
@Override
public void contextInitialized(ServletContextEvent arg0) {
// TODO Auto-generated method stub
}
}
/* 나는 내 웹 응용 프로그램 com/excelsave 폴더에 내 excelile을 저장하고 싶지만 거기에는 장신구가 없습니다. 그래서 다른 접근 방식을 제안 해주세요.이 부분에서 NPE를 얻었습니다. {String filePath = "C : /apache-tomcat-7.0.54/webapps"+ getServletContext(). getRealPath ("MyAppHome") + File.separator + "udaanmasterdatabase.xls"} */웹 애플 리케이션 프로젝트 폴더에 엑셀 파일을 만드는 방법,하지만 NullpointerException지고있어?
스택 추적과 함께 널 포인터 예외가 발생하는 코드의 관련 부분을 붙여주십시오. – SMA
NPE에 관해서 : _ 어디서 구할 수 있습니까? 나는 어떤 라인을 의미합니까? 그리고 라인 번호를 알려주지 마십시오. – Thomas
문자열 \t filePath = "C : /apache-tomcat-7.0.54/webapps"+ getServletContext(). getRealPath ("MyAppHome") + File.separator + "udaanmasterdatabase.xls" –