最新poi的jar包。與之前版本存在樣式設定區別

<!-- https://mvnrepository.com/artifact/org.apache.poi/poi -->
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi</artifactId>
    <version>3.17</version>
</dependency>

        //建立工作簿workbook
        //利用工作簿物件建立工作表sheet
        //利用工作表物件建立行row
        //利用行物件建立單元格物件cell
        HSSFWorkbook wb= new HSSFWorkbook(); //建立工作薄
 

        HSSFSheet sheet=wb.createSheet(); //利用工作薄建立工作表
//      表頭樣式        
        HSSFFont font = wb.createFont();//建立字型物件
        font.setFontHeightInPoints((short) 24);
        HSSFCellStyle cellstyle=wb.createCellStyle();
        cellstyle.setBorderBottom(BorderStyle.THIN);//下邊框
        cellstyle.setBorderLeft
 
(BorderStyle.THIN);//左邊框
        cellstyle.setBorderTop(BorderStyle.THIN);//上邊框
        cellstyle.setBorderRight(BorderStyle.THIN);//右邊框
        cellstyle.setAlignment(HorizontalAlignment.CENTER);//設定字型居中
        cellstyle.setFont(font); 
//        欄位名樣式
        HSSFFont font2 = wb.createFont();//建立字型物件
        font2.setFontHeightInPoints
 
((short) 16);
        HSSFCellStyle cellstyle1=wb.createCellStyle();
        cellstyle1.setBorderBottom(BorderStyle.THIN);//下邊框
        cellstyle1.setBorderLeft(BorderStyle.THIN);//左邊框
        cellstyle1.setBorderTop(BorderStyle.THIN);//上邊框
        cellstyle1.setBorderRight(BorderStyle.THIN);//右邊框
        cellstyle1.setAlignment(HorizontalAlignment.CENTER);
        cellstyle1.setFont(font2); 
//        列表樣式
        HSSFFont font1 = wb.createFont();//建立字型物件
        font1.setFontHeightInPoints((short) 12);
        HSSFCellStyle cellstyle2=wb.createCellStyle();
        cellstyle2.setBorderBottom(BorderStyle.THIN);//下邊框
        cellstyle2.setBorderLeft(BorderStyle.THIN);//左邊框
        cellstyle2.setBorderTop(BorderStyle.THIN);//上邊框
        cellstyle2.setBorderRight(BorderStyle.THIN);//右邊框
        cellstyle2.setFont(font1); 

        HSSFRow row = null;//建立行物件
        HSSFCell cell =null;//建立列物件

        CellRangeAddress cellRangeAddress =null;// new CellRangeAddress(0, 0, 0, 11);
        String yuanShi[] = new String[]{"序號","地區","部門","名稱","編碼","型別","建立時間"};
        // 合併單元格           前兩個引數行     後兩個列
        sheet.addMergedRegion(new CellRangeAddress(0,0,0, 6));//合併單元格
        row = sheet.createRow((short)0);//通過工作薄建立行物件
        cell = row.createCell((short)0);//通過行物件獲得列物件
        cell.setCellValue("事項清單列表");//設定列的值
        cell.setCellStyle(cellstyle);//設定表格樣式
        sheet.setDefaultRowHeight((short)30);
       //每次 
        row = sheet.createRow((short)1);//新建行物件
        for(int s=0;s<yuanShi.length;s++){
            cell = row.createCell((short)s);
            cell.setCellValue(yuanShi[s]);
            cell.setCellStyle(cellstyle1);
             sheet.setColumnWidth((short)0,(short)(15 * 300));
        }

        for(int j=0;j<object.size();j++){
            Object[] obj = object.get(j);
            row = sheet.createRow((short)j+2);

             cell = row.createCell((short)0);//建立列
             cell.setCellValue(j+1);//序號
             cell.setCellStyle(cellstyle2);
             sheet.setColumnWidth((short)0,(short)(15 * 150));

             cell = row.createCell((short)1);
             cell.setCellValue(obj[0].toString());//地區
             cell.setCellStyle(cellstyle2);
             sheet.setColumnWidth((short)1,(short)(15 * 300));

             cell = row.createCell((short)2);
             cell.setCellValue(obj[1].toString());//部門
             cell.setCellStyle(cellstyle2);
             sheet.setColumnWidth((short)2,(short)(15 * 300));

             cell = row.createCell((short)3);
             cell.setCellValue(obj[2].toString());//名稱
             cell.setCellStyle(cellstyle2);
             sheet.setColumnWidth((short)3,(short)(20 * 300));

             cell = row.createCell((short)4);
             cell.setCellValue(obj[4].toString());//編碼
             cell.setCellStyle(cellstyle2);
             sheet.setColumnWidth((short)4,(short)(15 * 300));

             cell = row.createCell((short)5);
             cell.setCellValue(obj[5].toString());//型別
             cell.setCellStyle(cellstyle2);
             sheet.setColumnWidth((short)5,(short)(15 * 300));

             cell = row.createCell((short)6);
             cell.setCellValue(obj[3].toString());//建立時間
             cell.setCellStyle(cellstyle2);
             sheet.setColumnWidth((short)6,(short)(30 * 300));

        }
        // 第五步，寫入實體資料 實際應用中這些資料從資料庫得到，  
        // 第六步，將檔案存到指定位置  
        boolean t =false;
        try {  
            ServletOutputStream servletoutputstream = rep.getOutputStream();
            String fileName = "";
            if(req.getHeader("user-agent").indexOf("MSIE") != -1 || req.getHeader("user-agent").indexOf("rv:11") !=-1) {
                fileName = java.net.URLEncoder.encode("匯出","utf-8") + ".xls"; 
            }else{
                fileName = new String("匯出".getBytes("utf-8"),"iso-8859-1")+ ".xls"; 
            } 
            rep.setHeader("Content-disposition", "attachment; filename="+ fileName);
            rep.setContentType("application/vnd.ms-excel;charset=utf-8");
            wb.write(servletoutputstream); 
            servletoutputstream.flush();
            t =true;
            servletoutputstream.close();
        }  
        catch (Exception e) {  
            e.printStackTrace();  
        } 
        return t;