poi读写excel

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   (the "License"); you may not use this file except in compliance with
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       http://www.apache.org/licenses/LICENSE-2.0

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   distributed under the License is distributed on an "AS IS" BASIS,
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   See the License for the specific language governing permissions and
   limitations under the License.
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import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;



import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFDataFormat;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFRichTextString;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import org.apache.poi.ss.util.CellRangeAddress;

/**
* File for HSSF testing/examples
*
* THIS IS NOT THE MAIN HSSF FILE!! This is a utility for testing functionality.
* It does contain sample API usage that may be educational to regular API
* users.
*
* @see #main
* @author Andrew Oliver (acoliver at apache dot org)
*/
public final class HSSFReadWrite {

/**
* creates an {@link HSSFWorkbook} the specified OS filename.
*/

public static void main(String[] args) throws IOException
{



try { 
           InputStream input = new FileInputStream("d:\\poi.xls"); 
           POIFSFileSystem fs = new POIFSFileSystem(input); 
           HSSFWorkbook wb = new HSSFWorkbook(fs); 
           HSSFSheet sheet = wb.getSheetAt(0); 
           // Iterate over each row in the sheet 
           Iterator rows = sheet.rowIterator(); 
           while (rows.hasNext()) { 
            HSSFRow row = (HSSFRow) rows.next(); 
          
            // Iterate over each cell in the row and print out the cell"s 
            // content 
            Iterator cells = row.cellIterator(); 
            while (cells.hasNext()) { 
             HSSFCell cell = (HSSFCell) cells.next(); 
           
             switch (cell.getCellType()) { 
             case HSSFCell.CELL_TYPE_NUMERIC: 
              System.out.print(cell.getNumericCellValue()); 
              break; 
             case HSSFCell.CELL_TYPE_STRING: 
              System.out.print(cell.getStringCellValue()); 
              break; 
             case HSSFCell.CELL_TYPE_BOOLEAN: 
              System.out.print(cell.getBooleanCellValue()); 
              break; 
             case HSSFCell.CELL_TYPE_FORMULA: 
              System.out.print(cell.getCellFormula()); 
              break; 
             default: 
              System.out.print("unsuported sell type"); 
              break; 
             } 
           
            }  System.out.println(); 
           } 
          } catch (IOException ex) { 
           ex.printStackTrace(); 
          } 
} 
}