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);  

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");  

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()  

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);  

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()  

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;   
    }  

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;   
    }  

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);  

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));