java读,写Excel(poi)

 写Excel

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;

/**
 * Poi写Excel
 * 
 * @author jianggujin
 * 
 */
public class PoiWriteDemo
{
   public static void main(String[] args) throws IOException
   {
      // 创建工作薄
      HSSFWorkbook workbook = new HSSFWorkbook();
      // 创建工作表
      HSSFSheet sheet = workbook.createSheet("sheet1");

      for (int row = 0; row < 10; row++)
      {
         HSSFRow rows = sheet.createRow(row);
         for (int col = 0; col < 10; col++)
         {
            // 向工作表中添加数据
            rows.createCell(col).setCellValue("data" + row + col);
         }
      }

      File xlsFile = new File("poi.xls");
      FileOutputStream xlsStream = new FileOutputStream(xlsFile);
      workbook.write(xlsStream);
   }
}

 读Excel

import java.io.File;
import java.io.IOException;

import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.WorkbookFactory;

/**
 * Poi写Excel
 * 
 * @author jianggujin
 * 
 */
public class PoiReadDemo
{
   public static void main(String[] args) throws IOException,
         InvalidFormatException
   {
      File xlsFile = new File("poi.xls");
      // 获得工作簿
      Workbook workbook = WorkbookFactory.create(xlsFile);
      // 获得工作表个数
      int sheetCount = workbook.getNumberOfSheets();
      // 遍历工作表
      for (int i = 0; i < sheetCount; i++)
      {
         Sheet sheet = workbook.getSheetAt(i);
         // 获得行数
         int rows = sheet.getLastRowNum() + 1;
         // 获得列数，先获得一行，在得到改行列数
         Row tmp = sheet.getRow(0);
         if (tmp == null)
         {
            continue;
         }
         int cols = tmp.getPhysicalNumberOfCells();
         // 读取数据
         for (int row = 0; row < rows; row++)
         {
            Row r = sheet.getRow(row);
            for (int col = 0; col < cols; col++)
            {
               System.out.printf("%10s", r.getCell(col).getStringCellValue());
            }
            System.out.println();
         }
      }
   }
}