poi 导出excel 生成等比例图片

poi 导出的带等比例图片方法

/**
    *
    * <p>Description: 将一物一码列表导出到excel</p>
    * @param response
    * @param list
    * @throws IOException
    */
   public void exportExcel(DispMeta meta) throws IOException {

       Map<String, Object> params = new HashMap<String, Object>();
       params.put("orderNum", meta.getRequest().getParameter("orderNum"));
       meta.setParams(params);

        IDispApi service;

        meta.setParams(params);
        meta.setMapkey("OneThingAndOneYardService.queryProductCodeListExport");
        try {
            service = find(ModulePbDesc.PB_SALES_02, meta.getMapkey());
            service.disp(meta);
        } catch (DispException e) {
            e.printStackTrace();
        }
        ArrayList<Map<String,Object>> list = (ArrayList<Map<String, Object>>) meta.getResult();

        HSSFWorkbook workbook = new HSSFWorkbook ();// 创建一个Excel文件
         HSSFSheet sheet = workbook.createSheet("一物一码");// 创建一个Excel的Sheet
          sheet.setColumnWidth(0, 40 * 256);
          sheet.setColumnWidth(1, 40 * 256);
          sheet.setColumnWidth(2, 40 * 256);
          sheet.setColumnWidth(3, 40 * 256);
          sheet.setColumnWidth(4, 40 * 256);
          sheet.setColumnWidth(5, 40 * 256);
          sheet.setColumnWidth(6, 40 * 256);
          sheet.setColumnWidth(7, 40 * 256);

         HSSFRow row4 = sheet.createRow(0);
         HSSFCell cell4_1 = row4.createCell(0);
         HSSFCell cell4_2 = row4.createCell(1);
         HSSFCell cell4_3 = row4.createCell(2);
         HSSFCell cell4_4 = row4.createCell(3);
         HSSFCell cell4_5 = row4.createCell(4);
         HSSFCell cell4_6 = row4.createCell(5);
         HSSFCell cell4_7 = row4.createCell(6);
         HSSFCell cell4_8 = row4.createCell(7);
          cell4_1.setCellValue( "一物一码" );
          cell4_2.setCellValue( "订单编号" );
          cell4_3.setCellValue( "商品编码" );
          cell4_4.setCellValue( "规格材质" );
          cell4_5.setCellValue( "主人账号" );
          cell4_6.setCellValue( "柜号" );
          cell4_7.setCellValue( "配置号" );
          cell4_8.setCellValue( "生效日期" );

         HSSFCellStyle style4= workbook.createCellStyle();
         style4.setAlignment(HSSFCellStyle. ALIGN_CENTER);//水平居中
         style4.setVerticalAlignment(HSSFCellStyle. VERTICAL_CENTER);//垂直居中
         style4.setWrapText( true);//自动换行
         style4.setFillForegroundColor(IndexedColors.SKY_BLUE.getIndex());
         style4.setFillPattern(CellStyle.SOLID_FOREGROUND);
         HSSFFont font4 = workbook.createFont();
//       font.setFontName("华文行楷");//设置字体名称
          font4.setFontHeightInPoints(( short)15);//设置字号
//          font4.setBoldweight(boldweight)( true);
          style4.setFont(font4);

//       cell4.setCellStyle(style4);
          cell4_1.setCellStyle(style4);
          cell4_2.setCellStyle(style4);
          cell4_3.setCellStyle(style4);
          cell4_4.setCellStyle(style4);
          cell4_5.setCellStyle(style4);
          cell4_6.setCellStyle(style4);
          cell4_7.setCellStyle(style4);
          cell4_8.setCellStyle(style4);
          //row 4   - items List header  -------------------------end

          //row 5    - items List   -------------------------start
          for (int i = 0; i < list.size(); i++) {
             HSSFRow row5 = sheet.createRow( i+1);
             HSSFCell cell5_1 = row5.createCell(0);
             HSSFCell cell5_2 = row5.createCell(1);
             HSSFCell cell5_3 = row5.createCell(2);
             HSSFCell cell5_4 = row5.createCell(3);
             HSSFCell cell5_5 = row5.createCell(4);
             HSSFCell cell5_6 = row5.createCell(5);
             HSSFCell cell5_7 = row5.createCell(6);
             HSSFCell cell5_8 = row5.createCell(7);
             Map<String, Object> map = list.get(i);
             // img --start
             ByteArrayOutputStream outStream_item = new ByteArrayOutputStream();
              // 将图片写入流中
             BufferedImage bufferImg_item = ImageIO.read(new FileInputStream("D:"+map.get("img_code").toString()));
             ImageIO. write(bufferImg_item, "PNG", outStream_item);

             row5.setHeightInPoints(80);
             int width = bufferImg_item.getWidth();//原始宽度
             int height = bufferImg_item.getHeight();//原始高度
             // 一个12号字体的宽度为13,前面已设置了列的宽度为30*256，故这里的等比例高度计算如下
             height = (int) Math.round((height * (30 * 13) * 1.0 / width));
             // excel单元格高度是以点单位，1点=2像素; POI中Height的单位是1/20个点，故设置单元的等比例高度如下
             row5.setHeight((short) (height / 2 * 20));
             // 利用HSSFPatriarch将图片写入EXCEL
             HSSFPatriarch patri_item = sheet.createDrawingPatriarch();
             HSSFClientAnchor anchor_item = new HSSFClientAnchor(0, 0, 0, 0, (short ) 0, i+1, (short) 1, i+2);
             patri_item.createPicture(anchor_item, workbook.addPicture(outStream_item.toByteArray(), HSSFWorkbook.PICTURE_TYPE_PNG));
              // img -- end

              //订单编号
              cell5_2.setCellValue(map.get("order_num").toString());
              //商品编码
              cell5_3.setCellValue(map.get("product_num").toString());
              //规格材质
              cell5_4.setCellValue(map.get("size_name").toString());
              //主人账号
              cell5_5.setCellValue(map.get("host_account")==null?"":map.get("host_account").toString());
              //柜号
              cell5_6.setCellValue(map.get("cabinet_number").toString());
              //配置号
              cell5_7.setCellValue(map.get("config_num").toString());
              //生效日期
              cell5_8.setCellValue(map.get("effective_time").toString());

             HSSFCellStyle style5=workbook.createCellStyle();
              style5.setAlignment(HSSFCellStyle.ALIGN_CENTER);//水平居中
              style5.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);//垂直居中
              style5.setWrapText( true);//自动换行

              cell5_2.setCellStyle(style5);
              cell5_3.setCellStyle(style5);
              cell5_4.setCellStyle(style5);
              cell5_5.setCellStyle(style5);
              cell5_6.setCellStyle(style5);
              cell5_7.setCellStyle(style5);
              cell5_8.setCellStyle(style5);

         }
          //row 5    - items List   -------------------------end

       // 第六步，将文件存到指定位置
       try
       {
           String excelName="一物一码.xls";

           meta.getResponse().addHeader( "Content-Disposition", "attachment;filename="
                   + new String(excelName.getBytes("gb2312" ), "ISO-8859-1" ));
//           response.addHeader("Content-Length", "" + 1024);
           meta.getResponse().setContentType("application/vnd.ms-excel;charset=utf-8" );
           BufferedOutputStream out =  new BufferedOutputStream(meta.getResponse().getOutputStream());
           workbook.write(out);
           out.close();
       }
       catch (Exception e )
       {
           e.printStackTrace();
       }
   }