如何将数据从struts2导出到Excel

我希望数据以Excel格式导出。我在将数据写入Excel文件时遇到问题，下载时发现它不是Excel格式

在下面的第一个方法中，我从数据库中获取数据，并将其作为列表发送给需要文件名的第二个方法。在第二种方法中，我尝试将数据库数据写入Excel文件

我也做了导出到PDF的编码。它被正确下载，但在URL栏

downloadtheacherlistinexcel.action

中。我给出的文件路径如下：

String fileName=“f:\\teachersList.pdf”

。在浏览器中下载时，文件名会像

f-teachersList

一样出现

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;
    }

为Excel编写的代码

@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;
    }

---

行动类

 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类

 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;
        }

public HSSF工作手册导出目录（教师列表）{
HSSF工作簿=空；
试一试{
工作簿=新的HSSF工作簿（）；
HSSFSheet sheet=workbook.createSheet（“产品列表”）；
//创建标题
行标题=sheet.createRow（0）；
rowHeading.createCell（0.setCellValue（“名称”）；
行标题.createCell（1）.setCellValue（“手机号码”）；
rowHeading.createCell（2.setCellValue（“电子邮件ID”）；
行标题.createCell（3）.setCellValue（“指定”）；
对于（int i=0；i<4；i++）{
CellStyleRowHeading=工作簿.createCellStyle（）；
Font=workbook.createFont（）；
font.setBoldweight（font.BOLDWEIGHT\u BOLD）；
font.setFontName（hssfont.font_ARIAL）；
字体设置字体高度输入点（（短）11）；
stylerowHeading.setFont（字体）；
stylerowHeading.setVerticalAlignment（CellStyle.ALIGN_CENTER）；
rowHeading.getCell（i）.setCellStyle（stylerowHeading）；
}
int r=1；
for（教师到t:教师列表）{
String teacherName=t.getTeacherFirstName（）+“”+t.getTeacherMiddleName（）+“”
+t.getTeacherLastName（）；
Row Row=sheet.createRow（r）；
//名称列
Cell cellName=row.createCell（0）；
cellName.setCellValue（teacherName）；//（在此行后运行一次）
//手机号码栏
Cell cellMobileNumber=row.createCell（1）；
setCellValue（t.getTeacherMobileNumber（））；
//电子邮件栏
Cell cellEmail=row.createCell（2）；
setCellValue（t.getTeacherEmailID（））；
//名称栏
Cell cellsignation=行。createCell（3）；
cellDesignation.setCellValue（t.getTeacherDesignation（））；
r++；
}
//excel工作表中的自动适配列
对于（int i=0；i<4；i++）{
表1.autoSizeColumn（i）；
}
System.out.println（“Excel编写成功”）；
}捕获（例外e）{
e、 printStackTrace（）；
}
返回工作簿；
}

Struts配置

<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>

应用程序/vnd.ms-excel
输入流
附件filename=“teachersList.xls”
4096

为什么要写入文件，而不仅仅是直接从struts写入流？给我演示一下如何做到这一点

 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;
        }

<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>