如何使用apache POI将新工作表添加到现有excel工作簿？

Question

我试图在一本工作簿中将List数据写入多个excel表.与第一个列表一样,代码将创建新工作簿并为列表[1]创建新工作表,对于第二个列表,它将在现有工作簿中创建新工作表,依此类推.所以我写下面的代码.但它不起作用,我只能看到列表[1]的第一张表.有人可以帮我提供任何替代解决方案吗？

我写的下面的代码

    ArrayList<List<String>> tempresultdata=this.getSummaryList();
    HSSFWorkbook workbook = new HSSFWorkbook();
    String fileName="Path\\To\\XLS";
    File file = new File(fileName);
    FileOutputStream out;           
    if(!file.exists()) // This will create new workbook with new sheet if it doesnt exists{

                HSSFSheet mySheet = workbook.createSheet(sheetname);
                writeExcel(mySheet,tempresultdata);
    } else // This add new sheet to above created workbook {
            try {
                HSSFWorkbook myWorkBook = (HSSFWorkbook) WorkbookFactory.create(file);
                workbook=myWorkBook;
                HSSFSheet mySheet = (HSSFSheet) workbook.createSheet(sheetname);
                writeExcel(mySheet,tempresultdata);                 
            } catch (InvalidFormatException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
    }   
    try{
        out = new FileOutputStream(fileName,true);
        workbook.write(out);
        out.close();
        }catch(Exception e){ 
            e.printStackTrace();
        }

谢谢,Priyank Shah

Answer 1

如果文件不存在则此代码创建新文件并创建示例sheet1但如果文件存在则将新工作表添加到现有excel文件.

    HSSFWorkbook workbook = null;
    File file = new File(context.getExternalFilesDir(null), "Sample.xls");
    FileOutputStream fileOut = new FileOutputStream(file);

    if (file.exists()) {
        try {
            workbook = (HSSFWorkbook)WorkbookFactory.create(file);
        } catch (InvalidFormatException e) {
            e.printStackTrace();
        }
        HSSFSheet sheet = workbook.createSheet("Sample sheet2");
    }
    else{
        workbook = new HSSFWorkbook();
        HSSFSheet sheet = workbook.createSheet("Sample sheet1");
    }
    workbook.write(fileOut);
    fileOut.close();

Answer 2

看起来你只写出sheet了workbook