POI操作Excel文档－中级篇

http://ltc603.javaeye.com/blog/30040
1、遍历workbook

    // load源文件
    POIFSFileSystem fs = new POIFSFileSystem(new FileInputStream(filePath));
    HSSFWorkbook wb = new HSSFWorkbook(fs);
    for (int i = 0; i < wb.getNumberOfSheets(); i++) {
      HSSFSheet sheet = wb.getSheetAt(i);
      for (int j = sheet.getFirstRowNum(); j < sheet.getLastRowNum(); j++) {
        HSSFRow row = sheet.getRow(j);
        if (row != null) {
          // 。。。操作}
        }
      }
    }
    // 目标文件
    FileOutputStream fos = new FileOutputStream(objectPath);
    // 写文件
    wb.write(fos);
    fos.close();

2、得到列和单元格

HSSFRow row = sheet.getRow(i);   
HSSFCell cell = row.getCell((short) j);  

3、设置sheet名称和单元格内容为中文

wb.setSheetName(n, "中文",HSSFCell.ENCODING_UTF_16);       
cell.setEncoding((short) 1);   
cell.setCellValue("中文");  

4、单元格内容未公式或数值，可以这样读写

cell.setCellType(HSSFCell.CELL_TYPE_NUMERIC);   
cell.getNumericCellValue();

5、设置列宽、行高

sheet.setColumnWidth((short)column,(short)width);   
row.setHeight((short)height);

6、添加区域，合并单元格

Region region = new Region((short)rowFrom,(short)columnFrom,(short)rowTo,(short)columnTo);   
sheet.addMergedRegion(region);   
//得到所有区域   
sheet.getNumMergedRegions() ;

7、常用方法
根据单元格不同属性返回字符串数值

  public String getCellStringValue(HSSFCell cell) {
    String cellValue = "";
    switch (cell.getCellType()) {
    case HSSFCell.CELL_TYPE_STRING:
      cellValue = cell.getStringCellValue();
      if (cellValue.trim().equals("") || cellValue.trim().length() <= 0)
        cellValue = " ";
      break;
    case HSSFCell.CELL_TYPE_NUMERIC:
      cellValue = String.valueOf(cell.getNumericCellValue());
      break;
    case HSSFCell.CELL_TYPE_FORMULA:
      cell.setCellType(HSSFCell.CELL_TYPE_NUMERIC);
      cellValue = String.valueOf(cell.getNumericCellValue());
      break;
    case HSSFCell.CELL_TYPE_BLANK:
      cellValue = " ";
      break;
    case HSSFCell.CELL_TYPE_BOOLEAN:
      break;
    case HSSFCell.CELL_TYPE_ERROR:
      break;
    default:
      break;
    }
    return cellValue;
  }

8、常用单元格边框格式

虚线HSSFCellStyle.BORDER_DOTTED
实线HSSFCellStyle.BORDER_THIN

  public static HSSFCellStyle getCellStyle(short type) {
    HSSFWorkbook wb = new HSSFWorkbook();
    HSSFCellStyle style = wb.createCellStyle();
    style.setBorderBottom(type);// 下边框
    style.setBorderLeft(type);// 左边框
    style.setBorderRight(type);// 右边框
    style.setBorderTop(type);// 上边框
    return style;
  }

9、设置字体和内容位置

HSSFFont f  = wb.createFont();   
f.setFontHeightInPoints((short) 11);// 字号
f.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);// 加粗
style.setFont(f);   
style.setAlignment(HSSFCellStyle.ALIGN_CENTER);// 左右居中
style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);// 上下居中
style.setRotation(short rotation);// 单元格内容的旋转的角度
HSSFDataFormat df = wb.createDataFormat();   
style1.setDataFormat(df.getFormat("0.00%"));// 设置单元格数据格式
cell.setCellFormula(string);// 给单元格设公式
style.setRotation(short rotation);// 单元格内容的旋转的角度
cell.setCellStyle(style);  

10、插入图片

// 先把读进来的图片放到一个ByteArrayOutputStream中，以便产生ByteArray
ByteArrayOutputStream byteArrayOut = new ByteArrayOutputStream();
BufferedImage bufferImg = ImageIO.read(new File("ok.jpg"));
ImageIO.write(bufferImg, "jpg", byteArrayOut);
// 读进一个excel模版
FileInputStream fos = new FileInputStream(filePathName + "/stencil.xlt");
fs = new POIFSFileSystem(fos);
// 创建一个工作薄
HSSFWorkbook wb = new HSSFWorkbook(fs);
HSSFSheet sheet = wb.getSheetAt(0);
HSSFPatriarch patriarch = sheet.createDrawingPatriarch();
HSSFClientAnchor anchor = new HSSFClientAnchor(0, 0, 1023, 255, (short) 0, 0, (short) 10, 10);
patriarch.createPicture(anchor, wb.addPicture(byteArrayOut.toByteArray(), HSSFWorkbook.PICTURE_TYPE_JPEG));