Java代码生成和解析xls文件

使用poi来生成xls文件：引用的包poi-3.2.final.jar;

要了解的类HSSFWorkbook,HSSFSheet,HSSFRow,HSSFCell

HSSFWorkbook workbook=new HSSFWorkbook();得到一个Excel文件的引用

HSSFSheet sheet=workbook.createSheet();得到一个sheet,还有HSSFSheet sheet=workbook.createSheet("sheet1");方法可以设置Sheet的名称。

然后我们可以得到一行HSSFRow row=sheet.createRow(rowNum);

最后我们可以得到的是HSSFCell cell=row.create(cellNum);在Cell中还有一个类型的问题，一定要注意



下面是一个从数据库里面读取数据生成文件的方法

public void testQuery() {
    Transaction tx = null;
    tx = session.beginTransaction();
    Query query = session.createQuery("from Tid");
    List<Tid> list = query.list();
    tx.commit();
  int k = 0;
  HSSFWorkbook workbook = new HSSFWorkbook();
  HSSFSheet sheet = workbook.createSheet("sheet1");

  HSSFRow row = sheet.createRow(k);
  k++;

  //得到一个HSSFCell对象
  HSSFCell cell1 = row.createCell(0);

  //首先要设置HSSFCell的类型，一共有五种CELL_TYPE_STRING,CELL_TYPE_NUMBERIC,CELL_TYPE_FORMULA,

//CELL_TYPE_BLANK,CELL_TYPE_BOOLEAN,CELL_TYPE_ERROR,共6种

//具体可以查看文档http://poi.apache.org/apidocs/org/apache/poi/hssf/usermodel/HSSFCell.html#getCellType()
  cell1.setCellType(HSSFCell.CELL_TYPE_STRING);
  cell1.setCellValue((new HSSFRichTextString("MER_NUM")));



HSSFCell cell2 = row.createCell(1);
  cell1.setCellType(HSSFCell.CELL_TYPE_STRING);
  cell2.setCellValue(new HSSFRichTextString("TML_NUM"));



  HSSFCell cell3 = row.createCell(2);
  cell1.setCellType(HSSFCell.CELL_TYPE_STRING);
  cell3.setCellValue(new HSSFRichTextString("COUNTER_NUM"));


for (Iterator<Tid> it = list.iterator(); it.hasNext();) {
      Tid tid = (Tid) it.next();
       HSSFRow row_ = sheet.createRow((short) k);
      

       HSSFCell c1 = row_.createCell(0);
       c1.setCellType(HSSFCell.CELL_TYPE_STRING);
       c1.setCellValue((new HSSFRichTextString(tid.getMer_num())));

    

       HSSFCell c2 = row_.createCell(1);
       c2.setCellType(HSSFCell.CELL_TYPE_STRING);
       c2.setCellValue(new HSSFRichTextString(tid.getTml_num()));

  

       HSSFCell c3 = row_.createCell(2);
       c3.setCellType(HSSFCell.CELL_TYPE_STRING);
       c3.setCellValue(new HSSFRichTextString(tid.getCounter_num()));
       k++;
  }

  //新建输出流对象FileOutputStream
  FileOutputStream fos = null;
  try {
     fos = new FileOutputStream("D://T99_TID_RELA.xls");

    //然后写入HSSFWorkbook中
     workbook.write(fos);
     fos.flush();
  } catch (Exception e) { // TODO Auto-generated catch block
     e.printStackTrace();
  } finally {
   if (null != fos) {
    try {
     fos.close();
     System.out.println("文件生成！");
    } catch (IOException e) {
     e.printStackTrace();
    }
   }
  }
}



HSSFCell类型判断与取值的方法

public String getCellValue(HSSFCell cell)throws Exception{

       int cellType=cell.getCellType();

       String cellValue=null;

      switch(cellType){   

       case HSSFCell.CELL_TYPE_NUMERIC:  
            cellValue = String.valueOf(cell.getNumericCellValue());

           /*

             *DecimalFormat df=new DecimalFormat("#");
             *cellValue = df.format(cell.getNumericCellValue());

             *DecimalFormat表示的数据格式化，有很多中用法

             */
            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:
             throw new IllegalArgumentException("数据格式不对");

      }

      return cellValue;

}







解析一个Excel文件

public void testRead() {
  HSSFWorkbook workbook = null;
  DecimalFormat df = new DecimalFormat("#");
  try {
   workbook = new  HSSFWorkbook(new FileInputStream(new File(
     "D://Book1.xls")));

   //POIFSFileSystem fs = new POIFSFileSystem(new FileInputStream(filePath));
   // 获得Sheet数
   System.out
     .println("===SheetsNum===" + workbook.getNumberOfSheets());
   // 开始读取
   for (int i = 0; i < workbook.getNumberOfSheets(); i++) {
    if (null != workbook.getSheetAt(i)) {
     // 获得一个Sheet
     HSSFSheet sheet = workbook.getSheetAt(i);
     System.out.println("共有" + sheet.getLastRowNum() + "行");
     for (int rowNumOfSheet = 10; rowNumOfSheet <= sheet
       .getLastRowNum(); rowNumOfSheet++) {
      if (null != sheet.getRow(rowNumOfSheet)) {
       // 获得一个row
       HSSFRow row = sheet.getRow(rowNumOfSheet);
       System.out.print("第" + rowNumOfSheet + "行   ");
       // System.out.print("一行有"+row.getLastCellNum()+"单元格");
       for (short cellNumOfRow = 0; cellNumOfRow < row
         .getLastCellNum(); cellNumOfRow++) {

        HSSFCell cell = row.getCell(cellNumOfRow);
        int cellType = cell.getCellType();
        switch (cellType) {
        case 0:// Numberic
          String strCell = df.format(cell.getNumericCellValue());
          System.out.print(strCell + " ");
         break;
        case 1:
          strCell = cell.getRichStringCellValue().getString();
          System.out.print(strCell + " ");
          break;
        default:
          System.out.println("数据格式不对！");
        }
       }
       System.out.print("/n");
      }
     }
    }
   }
  } catch (FileNotFoundException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }

}





工具集HSSFCellUtil  http://poi.apache.org/apidocs/org/apache/poi/hssf/usermodel/contrib/HSSFCellUtil.html



设置Sheet名称和单元格内容为中文

workbook.setSheetName(n,"库存",HSSFCell.ENCODING_UTF_16);

cell.setEncoding((short)1);cell.setCellValue("单位");



设置列宽和行高

sheet.setColumnWidth((short)column,(short)width);

row.setHeight((short)height);



添加区域，合并单元格

Region region=new Region((short)rowForm,(short)columnForm,(short)rowTo,(short)columnTo);

sheet.addMergedRegion(region);

// 得到该区域

sheet.getNumMergedRegion();



设置字体和内容位置

HSSFFont font=workbook.createFont();

font.setFontHeightInPoints((short) 11);//字号  
font.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);//加粗  
style.setFont(font);  
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)



常用的单元格边框格式

public static HSSFCellStyle getCellStyle(short type) {     

         HSSFWorkbook workbook =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;

      } 

虚线HSSFCellStyle.BORDER_DOTTED

实线HSSFCellStyle.BORDER_THIN



最后是插入图片

/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));