导出excel表格

public  static void exportExcel( OutputStream os){
        try {
            //创建工作簿
            WritableWorkbook workbook = Workbook.createWorkbook(os);
            //创建工作表
            WritableSheet sheet = workbook.createSheet("Sheet", 0);

            //设置纵横打印(默认为纵打)、打印纸
            jxl.SheetSettings sheetSet = sheet.getSettings();
            sheetSet.setProtected(false);

            //设置单元格字体
            WritableFont NormalFont = new WritableFont(WritableFont.ARIAL,10);
            WritableFont BoldFont = new WritableFont(WritableFont.ARIAL,10,WritableFont.BOLD);

            //设置三种单元格样式，灵活备用
            //用于标题居中
            WritableCellFormat wcf_center = new WritableCellFormat(BoldFont);
            wcf_center.setBorder(Border.ALL, BorderLineStyle.THIN);//线条
            wcf_center.setVerticalAlignment(VerticalAlignment.CENTRE);//文字垂直对齐
            wcf_center.setAlignment(Alignment.CENTRE);//文字水平对齐
            wcf_center.setWrap(false);//文字是否换行

            // 用于正文居左
            WritableCellFormat wcf_left = new WritableCellFormat(NormalFont);
            wcf_left.setBorder(Border.NONE, BorderLineStyle.THIN); // 线条
            wcf_left.setVerticalAlignment(VerticalAlignment.CENTRE); // 文字垂直对齐
            wcf_left.setAlignment(Alignment.LEFT); // 文字水平对齐
            wcf_left.setWrap(false); // 文字是否换行

            //以下是excel开头大标题，暂时省略
            //sheet.mergeCells(0,0,cloWidth,0)
            //sheet.addCell(new Label(0,0,"XX报表",wcf_center));
            //以下是EXCEL第一行列标题
            ArrayList<String> title = new ArrayList<>();
            title.add("标题1");
            for(int i=0;i<codeNames.length;i++){
                title.add(codeNames[i]);
            }
            title.add("标题2");
            for(int i=0;i<title.size();i++){
                sheet.addCell(new Label(i,0,title.get(i),wcf_center));
            }
            // 以下是EXCEL正文数据
            for(int i=0;i<3);i++){
                sheet.addCell(new Label(0,i+1,"标题1内容"+i,wcf_left));
                sheet.addCell(new Label(0,i+1,"标题2内容"+i,wcf_left));
            }
            // 将以上缓存中的内容写到excel文件中
            workbook.write();
            workbook.close();
            Log.d("", "exportExcel: 成功");
        } catch (Exception e) {
            Log.d("", "exportExcel: 失败: "+e.toString());
        }
    }