Question

在我的项目中，我将创建一个ExcelWorkBook并将一些数据写入该工作簿。编写后，我希望它保存到用户下载路径，因此尝试了以下代码：

XSSFWorkbook hwb=new XSSFWorkbook();  
XSSFSheet sheet =  hwb.createSheet("Exam Marks Entry");
//writing data to workbook

//then targeting users download path as follows
String home = System.getProperty("user.home");
File file = new File(home+"/Downloads/"+mainDisplayDto.getClassName()+" "+mainDisplayDto.getExamName()+".xlsx");

FileOutputStream fileOut =  new FileOutputStream(file);  
hwb.write(fileOut);

以上代码仅在应用程序为本地时有效（保存工作簿以下载路径），而在应用程序位于 VPS 上时不起作用。

当应用程序不在本地运行时，如何将其保存到用户系统下载文件夹中？

我的问题也将得到解决，如果将数据写入工作簿后我可以在系统中打开excel文件，以便用户将其保存在所需的位置。

有人可以帮我吗？

Answer 1

您可以在锚标记或按钮元素上使用window.location.href =“”，并且当用户单击它时，您应该调用程序，响应将返回excel工作表并在用户的下载文件夹中下载。

例如： window.location.href =“ / downloadExcelMarks” 是我指的控制器的网址。它将调用我的控制器，然后我将从控制器发送响应以发送excel，如下所示：

SELECT person_id
FROM game_table
WHERE '{21, 10}' && game_ids

Answer 2

我想您可以理解，将文件保存到下载位置是浏览器的属性。您可以将浏览器的默认下载位置设置为文件系统中的任何位置。如何指定要存储在不同用户使用不同文件系统的用户系统中的响应。

Answer 3

我在@Jai Prakash建议的帮助下解决了，并更改了我的ajax调用和一些Java代码，请查看代码

ajax通话：

      $(document).on("click","#downlodMarksSheet",function(event){
            var examCatId=$("#meExamMainEV").val();     
            var classId=$(".mainContainer #meClass").val();  
            var secId=$(".mainContainer #sectionId").val() ;
            var stringFromDate=$(".mainContainer #FromDate").val();
            var stringToDate=$(".mainContainer #ToDate").val();
            var url = contextPath+"/excel/exportExcel/"+classId+"/"+secId+"/"+examCatId+"/"+stringFromDate.replace(/\//g, "-")+"/"+stringToDate.replace(/\//g, "-");
            window.location.href=url;
        });

**java code :**

@GetMapping(value = "/exportExcel/{classId}/{secId}/{examCatId}/{stringFromDate}/{stringToDate}")
    public HttpServletResponse updateStudentGeneralDetailss(@PathVariable("classId") int classId,
            @PathVariable("secId") int secId,@PathVariable("examCatId") int examCatId,
            @PathVariable("stringFromDate") String stringFromDate,
            @PathVariable("stringToDate") String stringToDate,HttpServletRequest request,HttpServletResponse response) {

        try { 



            String filename="";
            XSSFWorkbook hwb=new XSSFWorkbook();  
            XSSFSheet sheet =  hwb.createSheet("Exam Marks Entry");  
            XSSFRow subsHead=   sheet.createRow(0);
            subsHead.createCell(1).setCellValue("");
            XSSFRow subSubsIdsHead=   sheet.createRow(1);
            XSSFRow subSubs=   sheet.createRow(2);



            response.setContentType("application/vnd.ms-excel");

            ServletOutputStream outStream = response.getOutputStream();


            XSSFColor myColor = new XSSFColor(Color.YELLOW);

            XSSFCellStyle style = hwb.createCellStyle();  
            style.setAlignment(XSSFCellStyle.ALIGN_CENTER);
            style.setVerticalAlignment(XSSFCellStyle.VERTICAL_CENTER);
            style.setFillBackgroundColor(IndexedColors.YELLOW.getIndex());

            style.setBorderBottom(CellStyle.BORDER_THIN);
            style.setBottomBorderColor(IndexedColors.BLACK.getIndex());
            style.setBorderLeft(CellStyle.BORDER_THIN);
            style.setLeftBorderColor(IndexedColors.BLACK.getIndex());
            style.setBorderRight(CellStyle.BORDER_THIN);
            style.setRightBorderColor(IndexedColors.BLACK.getIndex());
            style.setBorderTop(CellStyle.BORDER_THIN);
            style.setTopBorderColor(IndexedColors.BLACK.getIndex());  



                ExmaExportDTO mainDisplayDto  = service.getExamPartten(examCatId, classId, secId,stringFromDate.replaceAll("-", "/"),stringToDate.replaceAll("-", "/"));

            List<ExamStudentMarksDisplaySubjectsDTO> subjects=  mainDisplayDto.getSubjectsList();
            int i=2;
            int formCol=2;
            int subsubCol=2;

            sheet.addMergedRegion(new CellRangeAddress(0,0,0,1));
            sheet.addMergedRegion(new CellRangeAddress(1,1,0,1));

            Cell cel=subSubs.createCell(0); 
            cel.setCellStyle(style);  
            cel.setCellValue("Student Ids");

            Cell cel1=subSubs.createCell(1);
            cel1.setCellStyle(style);  
            cel1.setCellValue("Student Name");

            /*iterating subjects*/
            for(ExamStudentMarksDisplaySubjectsDTO subObj : subjects)
            {  
                Cell cell=subsHead.createCell(formCol);
                cell.setCellStyle(style);
                cell.setCellValue(subObj.getSubjectName());;
                List<ExamStudentMarksDisplaySubjectsSubCatDTO> subSubj=subObj.getSubCatMarks();

                int subSubjLen=subSubj.size(); 

                int toCol=formCol+subSubjLen;

                sheet.addMergedRegion(new CellRangeAddress(0,0,formCol,toCol-1));

                for(ExamStudentMarksDisplaySubjectsSubCatDTO subsubObj :subSubj)
                {
                    Cell cell1=subSubsIdsHead.createCell(subsubCol);
                    cell1.setCellStyle(style);
                    cell1.setCellValue(subsubObj.getExmSubjectSubCategory());
                    Cell cell2=subSubs.createCell(subsubCol);
                    cell2.setCellStyle(style);  
                    cell2.setCellValue(subsubObj.getSubCatName()+"("+subsubObj.getSubCatMaxMarks()+")");
                    subsubCol++;
                }

                formCol=subSubjLen+formCol;;  
                i++;        
            }
            Cell cella=subSubs.createCell(subsubCol);
            cella.setCellStyle(style);
            cella.setCellValue("Description");

            Cell cell1a=subSubs.createCell(subsubCol+1);
            cell1a.setCellStyle(style);
            cell1a.setCellValue("No.of Working Days");

            Cell cell2a=subSubs.createCell(subsubCol+2);
            cell2a.setCellStyle(style);
            cell2a.setCellValue("No.of Present Days");


            List<ExamStudentMarksDisplayStudentsDTO> students=mainDisplayDto.getStudentList();
            /*iterating students*/
            int j=3;
            for(ExamStudentMarksDisplayStudentsDTO stu : students)
            {
                XSSFRow rows=   sheet.createRow(j);
                Cell cell3=rows.createCell(0);
                cell3.setCellStyle(style);
                cell3.setCellValue(stu.getStudentId());
                String lastName="";
                if(stu.getLastMame() !=null)
                {
                    lastName=stu.getLastMame();
                }
                Cell cell4=rows.createCell(1);
                cell4.setCellStyle(style); 
                cell4.setCellValue(stu.getFirstName()+" "+lastName);
                j++;
            }  

            response.setHeader("Content-Disposition", "attachment; filename="+mainDisplayDto.getClassName()+""+mainDisplayDto.getExamName()+".xlsx");
            hwb.write(outStream);
            outStream.close();

        }
catch (Exception e) {  
    e.printStackTrace();
}
        return response;
    }

谢谢！

如何将Excel文件保存到Java中的用户下载路径

3 个答案: