POI操作Excel文档－中级篇

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 i = sheet.getFirstRowNum(); i < sheet.getLastRowNum(); i ++) {
    HSSFRow row = sheet.getRow(i);
            if (row != null) {
        。。。操作}
       }
     }
// 目标文件
FileOutputStream fos = new FileOutputStream(objectPath);
//写文件
swb.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 
论坛里看到的 

//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));