jxl学习笔记（一）-------如何向excel文件中追加写入，而不会覆盖之前的内容

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这几天在写论文实验的时候，需要对比不同算法的不同指标，然后需要将每个实验跑出来的结果放在一个文档里面，进行对比，之前是每个实验放在独立的文件当中，现在全部放在一起，对比更加直观。

    private  static  int index = 1 ;
    private  static  WritableWorkbook book =  null;
    private  static  WritableSheet sheet =  null;
    private static void writeExcel(String sheetname,List<Double> bill, List<Double> cpltRt, List<Double> avgECost, int devicenum)
    {
        try {
                String testName = sheetname;
                sheetname = "summary";
                File file = new File(sheetname+".xls");
                int baseRow = (index-1)*6;
                 Number[][] numbers =  new Number[4][bill.size()];
                if(index==1)
                {
                    file.delete();
                }
                if(!file.exists())
                {
                    book =  Workbook.createWorkbook(file);
                    sheet = book.createSheet(sheetname, 0) ;

                    Label testLabel = new Label(0,baseRow,testName);
                     sheet.addCell(testLabel);
                for(int i=0;i<bill.size();i++)
                {
                    numbers[0][i] = new Number(i,baseRow+1,(i+1)*Parameters.Task_Inc_Step);
                    numbers[1][i] = new Number(i,baseRow+2,bill.get(i));
                    numbers[2][i] = new Number(i,baseRow+3,cpltRt.get(i));
                    numbers[3][i] = new Number(i,baseRow+4,avgECost.get(i));

                    sheet.addCell(numbers[0][i]);
                    sheet.addCell(numbers[1][i]);
                    sheet.addCell(numbers[2][i]);
                    sheet.addCell(numbers[3][i]);
                }
                    book.write();
                    book.close();
                }
                else
                {
                    Workbook wb = Workbook.getWorkbook(file);
                    File tempfile = new File("tempfile.xls");
                    WritableWorkbook wwb = Workbook.createWorkbook(tempfile, wb);
                    WritableSheet ws = wwb.getSheet(0);


                    Label testLabel = new Label(0,baseRow,testName);
                    ws.addCell(testLabel);
                for(int i=0;i<bill.size();i++)
                {
                    numbers[0][i] = new Number(i,baseRow+1,(i+1)*Parameters.Task_Inc_Step);
                    numbers[1][i] = new Number(i,baseRow+2,bill.get(i));
                    numbers[2][i] = new Number(i,baseRow+3,cpltRt.get(i));
                    numbers[3][i] = new Number(i,baseRow+4,avgECost.get(i));

                    ws.addCell(numbers[0][i]);
                    ws.addCell(numbers[1][i]);
                    ws.addCell(numbers[2][i]);
                    ws.addCell(numbers[3][i]);
                }
                    wwb.write();
                    wwb.close();
                    wb.close();
                    file.delete();
                    tempfile.renameTo(file);
                }
                index ++;
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

简单说一下算法的思路，第一次写入的时候，用WritableWorkbook  WritableSheet 新建，后来，使用之前的已经写入的文件，创建一个新文件，最后，将文件改名。

jxl学习笔记（一）-------如何向excel文件中追加写入，而不会覆盖之前的内容

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原文地址：http://blog.csdn.net/rually/article/details/51329030