POI操作的一些中级操作[转]

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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));