POI操作Excel文档－中级篇

1、遍历workbook
Java代码
// 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
Java代码
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
Java代码
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
Java代码
cell.setCellType(HSSFCell.CELL_TYPE_NUMERIC); 
cell.getNumericCellValue() 



5、设置列宽、行高
Java代码
sheet.setColumnWidth((short)column,(short)width); 
row.setHeight((short)height); 



6、添加区域，合并单元格
Java代码
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
Java代码
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
Java代码
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
Java代码
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
Java代码
//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));