How to export data from struts2 to Excel - struts2

Question

I am expecting data to export in Excel format. I have a problem in writing data to Excel file and when I download that it is not in Excel format.
In the below first method I am getting data from a database and sending it as a list to a second method that expects a filename. In the second method I am trying to write the database data to an Excel file.
I have done coding for exporting to PDF also. It gets correctly downloaded, but in the URL bar downloadTeacherListINExcel.action. I have given a file path like this: String fileName = "f:\\teachersList.pdf". When it is downloaded in the browser the filename comes over like f-teachersList.
public String exportInExcel() {
// getting data from data base
listOfTeachers = reportService.getlistOfTeachers();
for (TeacherDTO teacherDTO : listOfTeachers) {
System.out.println(teacherDTO.getTeacherEmailID());
}
// sending a list data export in excel
String excelFileName = reportService.exportInExcel(listOfTeachers);
System.out.println(excelFileName);
try {
fileInputStream = new FileInputStream(excelFileName);
} catch (IOException e) {
e.printStackTrace();
}
System.out.println("Execl Download Method");
return SUCCESS;
}
Code written for Excel
#Override
public String exportInExcel(List<TeacherDTO> listOfTeachers) {
String fileName = "f:\\test\\teachersList.xls";
try {
HSSFWorkbook workbook = new HSSFWorkbook();
HSSFSheet sheet = workbook.createSheet("Products List");
// create heading
Row rowHeading = sheet.createRow(0);
rowHeading.createCell(0).setCellValue("Id");
rowHeading.createCell(1).setCellValue("Name");
for (int i = 0; i < 6; i++) {
CellStyle stylerowHeading = workbook.createCellStyle();
Font font = workbook.createFont();
font.setBoldweight(Font.BOLDWEIGHT_BOLD);
font.setFontName(HSSFFont.FONT_ARIAL);
font.setFontHeightInPoints((short) 11);
stylerowHeading.setFont(font);
stylerowHeading.setVerticalAlignment(CellStyle.ALIGN_CENTER);
rowHeading.getCell(i).setCellStyle(stylerowHeading);
}
int r = 1;
for (TeacherDTO teacher : listOfTeachers) {
Row row = sheet.createRow(r);
// Id column
Cell cellID = row.createCell(0);
cellID.setCellValue(teacher.getTeacherFirstName());// (run after
// this line
// once)
// name column
Cell cellName = row.createCell(1);
cellName.setCellValue(teacher.getTeacherEmailID());// (run after
// this line
// once)
r++;
}
// Auto fit
for (int i = 0; i < 6; i++) {
sheet.autoSizeColumn(i);
}
FileOutputStream fout = new FileOutputStream(new File(fileName));
workbook.write(fout);
fout.close();
System.out.println("Excel Written Success");
} catch (Exception e) {
System.out.println("%%%%%%%%%%%%%%%%%%"+e.getMessage());
}
return fileName;
}
Struts config
<action name="downloadTeacherListINExcel" class="com.pradeep.sms.controller.report.StaffReportAction" method="exportInExcel">
<result name="success" type="stream">
<param name="contentType">application/vnd.ms-excel</param>
<param name="inputName">fileInputStream</param>
<param name="contentDisposition">attachment;filename=${fileName}</param>
<param name="bufferSize">1024</param>
</result>
</action>
Error
Hibernate: select
pradeepkumarhe1989#gmail.com
%%%%%%%%%%%%%%%%%%null
f:\test\teachersList.xls
java.io.FileNotFoundException: f:\test\teachersList.xls (The system cannot find the file specified)

Answer 1

In action class
public String exportInExcel() {
//getting List of teachers
listOfTeachers = reportServiceExcel.getlistOfTeachers();
// sending list data to write in excel sheet
HSSFWorkbook workbook = reportServiceExcel.exportInExcel(listOfTeachers);
// code to download
try {
ByteArrayOutputStream boas = new ByteArrayOutputStream();
workbook.write(boas);
setInputStream(new ByteArrayInputStream(boas.toByteArray()));
} catch (IOException e) {
e.printStackTrace();
}
return SUCCESS;
}
Excel class
public HSSFWorkbook exportInExcel(List<TeacherDTO> listOfTeachers) {
HSSFWorkbook workbook = null;
try {
workbook = new HSSFWorkbook();
HSSFSheet sheet = workbook.createSheet("Products List");
// create heading
Row rowHeading = sheet.createRow(0);
rowHeading.createCell(0).setCellValue("Name");
rowHeading.createCell(1).setCellValue("Mobile Number");
rowHeading.createCell(2).setCellValue("Email ID");
rowHeading.createCell(3).setCellValue("Designation");
for (int i = 0; i < 4; i++) {
CellStyle stylerowHeading = workbook.createCellStyle();
Font font = workbook.createFont();
font.setBoldweight(Font.BOLDWEIGHT_BOLD);
font.setFontName(HSSFFont.FONT_ARIAL);
font.setFontHeightInPoints((short) 11);
stylerowHeading.setFont(font);
stylerowHeading.setVerticalAlignment(CellStyle.ALIGN_CENTER);
rowHeading.getCell(i).setCellStyle(stylerowHeading);
}
int r = 1;
for (TeacherDTO t : listOfTeachers) {
String teacherName = t.getTeacherFirstName() + "" + t.getTeacherMiddleName() + ""
+ t.getTeacherLastName();
Row row = sheet.createRow(r);
// Name column
Cell cellName = row.createCell(0);
cellName.setCellValue(teacherName);// (run after this line once)
// Mobile Number column
Cell cellMobileNumber = row.createCell(1);
cellMobileNumber.setCellValue(t.getTeacherMobileNumber());
// Email column
Cell cellEmail = row.createCell(2);
cellEmail.setCellValue(t.getTeacherEmailID());
// Designation column
Cell cellDesignation = row.createCell(3);
cellDesignation.setCellValue(t.getTeacherDesignation());
r++;
}
// Auto fit columns in excel sheet
for (int i = 0; i < 4; i++) {
sheet.autoSizeColumn(i);
}
System.out.println("Excel Written Success");
} catch (Exception e) {
e.printStackTrace();
}
return workbook;
}
Struts configuration
<action name="downloadTeacherListExcel" class="com.pradeep.sms.controller.report.StaffReportAction" method="exportInExcel">
<result name="success" type="stream">
<param name="contentType">application/vnd.ms-excel</param>
<param name="inputName">inputStream</param>
<param name="contentDisposition">attachment;filename="teachersList.xls"</param>
<param name="bufferSize">4096</param>
</result>
</action>

Answer 2

package com.download2excel;
import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.InputStream; import org.apache.poi.hssf.usermodel.HSSFRow; import org.apache.poi.hssf.usermodel.HSSFSheet; import org.apache.poi.hssf.usermodel.HSSFWorkbook; import com.opensymphony.xwork2.ActionSupport;
public class Excelwritinginjava extends ActionSupport { private InputStream fileInputStream;
public String createExcelFile() throws Exception { HSSFWorkbook workbook = new HSSFWorkbook(); HSSFSheet sheet = workbook.createSheet("January"); HSSFRow rowhead = sheet.createRow((short) 0); rowhead.createCell(0).setCellValue("S.No."); rowhead.createCell(1).setCellValue("Customer Name"); rowhead.createCell(2).setCellValue("Account Number"); rowhead.createCell(3).setCellValue("e-mail"); rowhead.createCell(4).setCellValue("Balance"); HSSFRow row = sheet.createRow((short) 1); row.createCell(0).setCellValue("1"); row.createCell(1).setCellValue("subodh"); row.createCell(2).setCellValue("7644864977"); row.createCell(3).setCellValue("subodh.orcl#gmail.com"); row.createCell(4).setCellValue("700000.00"); HSSFRow row1 = sheet.createRow((short) 2); row1.createCell(0).setCellValue("2"); row1.createCell(1).setCellValue("subodh sharma"); row1.createCell(2).setCellValue("22222222"); row1.createCell(3).setCellValue("subodh.orcl#gmail.com"); row1.createCell(4).setCellValue("200000.00"); ByteArrayOutputStream baos = new ByteArrayOutputStream(); workbook.write(baos); setFileInputStream(new ByteArrayInputStream(baos.toByteArray())); return SUCCESS; }
public InputStream getFileInputStream() { return fileInputStream; }
public void setFileInputStream(InputStream fileInputStream) { this.fileInputStream = fileInputStream; }
}
======================struts.xml ====
application/octet-stream fileInputStream attachment;filename="Download.xls" 1024