打開使用Apache POI創建的郵件附加excel文件時出錯

Question

我正在使用Apache POI創建一個Excel工作表，然后使用Java GWT發送相同的文件。創建的文件可以了。現在郵件中有兩個選項-保存或打開。當我將文件保存在計算機中時，它可以正常工作但是當我嘗試打開時，它在記事本中打開。在建議中它也沒有顯示excel。 這是我創建Excel工作表的代碼：

package com.ericsson.egi.sxs.utils;
import java.io.File;
import java.io.FileOutputStream;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;

import com.ericsson.egi.sxs.persistence.entity.AssetOrder;

public class CreateExcelFile {

    int rownum = 0;
    HSSFSheet firstSheet;
    Collection<File> files;
    HSSFWorkbook workbook;

     CreateExcelFile() {
    }

    public File createWeeklyReport(List<AssetOrder> tempOrderList) throws Exception {
            workbook = new HSSFWorkbook();
            firstSheet = workbook.createSheet("FIRST SHEET");
            List<String> headerRow = new ArrayList<String>();
            headerRow.add("Name of Supplier/Vendor");
            headerRow.add("Description of Contract");
            headerRow.add("Initiator");
            headerRow.add("Type Of Contract");
            headerRow.add("Template Source");
            headerRow.add("Savings");
            headerRow.add("Payment Term");
            headerRow.add("Code of Conduct Signed by Supplier");
            headerRow.add("RoHS clause Included");
            headerRow.add("Agreement No");
            headerRow.add("Agreement Validity From ");
            headerRow.add("Agreement Validity To");
            headerRow.add("Sanctioned Parties List Screening");
            headerRow.add("Sanctioned Parties List Screening Reasons in case no answer NO");
            headerRow.add("Registered in CLM");
            headerRow.add("Registered in CLM reasons if answer NO");
            headerRow.add("Current State");
            headerRow.add("Next State");
            headerRow.add("TAT for L1");
            headerRow.add("TAT for L2");
            headerRow.add("TAT for L3");
            headerRow.add("TAT for L4");
            headerRow.add("Current State Comments");

            List<List> recordToAdd = new ArrayList<List>();
            recordToAdd.add(headerRow); 
            for (AssetOrder order : tempOrderList ) {
                List<String> row = new ArrayList<String>();
                row.add(order.getSourcingDetails().getVendorName());
                row.add(order.getSourcingDetails().getContractDescription());
                row.add(order.getSourcingDetails().getInitiatorName());
                row.add(order.getSourcingDetails().getContractType());
                row.add(order.getSourcingDetails().getTemplateSource()); 
                row.add(order.getSourcingDetails().getSavings());
                row.add(order.getSourcingDetails().getPaymentTerm()); 
                if (order.getSourcingDetails().getIsCOCSigned()) {
                    row.add("YES");
                } else {
                    row.add("NO");
                }

                if (order.getSourcingDetails().getIsROHSIncluded()) {
                    row.add("YES");
                } else {
                    row.add("NO"); 
                }
                row.add(order.getSourcingDetails().getAgreementNo());
                row.add(order.getSourcingDetails().getValidityFrom().toString()); 
                row.add(order.getSourcingDetails().getValidityTo().toString());
                if (order.getSourcingDetails().getIsSPLScreening()) {
                    row.add("YES");
                } else {
                    row.add("NO");
                }
                row.add(order.getSourcingDetails().getReasonsForSPL());
                if (order.getSourcingDetails().getIsRegisteredInCLM()) {
                    row.add("YES");
                } else {
                    row.add("NO");
                }
                row.add(order.getSourcingDetails().getReasonsForCLM());
                row.add(order.getStatusMaster().getStatusName()); 
                row.add(null);
                row.add(null); 
                row.add(null);
                row.add(null); 
                row.add(null);
                row.add(order.getComments()); 

                recordToAdd.add(row);
            }

            CreateExcelFile cls = new CreateExcelFile(recordToAdd);
            File file = cls.createExcelFile(tempOrderList.get(0).getOrderRequesterSignum());           
            return file;
        }

        File createExcelFile(String requesterSignum) {
            FileOutputStream fos = null;
            File file = new File("/tmp/" + requesterSignum + "_StatusReport.xls");
            try {

                fos=new FileOutputStream(file);
                HSSFCellStyle hsfstyle=workbook.createCellStyle();
                hsfstyle.setBorderBottom((short) 1);
                hsfstyle.setFillBackgroundColor((short)245);

                workbook.write(fos);
            } catch (Exception e) {
                e.printStackTrace();
            }
            return file;
        }

         CreateExcelFile(List<List> l1) throws Exception {
         try {
                workbook = new HSSFWorkbook();
                firstSheet = workbook.createSheet("FIRST SHEET");
                for (int j = 0; j < l1.size(); j++) {
                    Row row = firstSheet.createRow(rownum);
                    List<String> l2= l1.get(j);

                    for(int k=0; k<l2.size(); k++)
                    {
                        Cell cell = row.createCell(k);
                        cell.setCellValue(l2.get(k));
                    }
                    rownum++;
                }

            } catch (Exception e) {
                e.printStackTrace();
            } finally {
            }

        }

}

Answer 1

根據計算機上安裝的Excel版本，嘗試使用其他Excel Extension 。

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- 編輯 -

可能是與內容類型有關的問題。 請確認您正在使用什么？

response.setContentType("APPLICATION/OCTET-STREAM");

// try this one if above doesn't work
//response.setContentType("application/vnd.ms-excel");

response.setHeader("Content-disposition", "attachment;filename=myExcel.xls");