Java读取excel(兼容03和07格式)

package ceshi;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;


import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
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.xssf.usermodel.XSSFWorkbook;
import org.apache.xmlbeans.impl.piccolo.io.FileFormatException;

public class 读取excel2007 {
    

    private static final String EXTENSION_XLS = "xls";
    private static final String EXTENSION_XLSX = "xlsx";
public static void main(String[] args) {
    读取excel2007 excel = new 读取excel2007();
        try {
            excel.readExcel("F:\\红楼人物.xlsx");
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (FileFormatException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
}
    /***
     * <pre>
     * 取得Workbook对象(xls和xlsx对象不同,不过都是Workbook的实现类)
     *   xls:HSSFWorkbook
     *   xlsx：XSSFWorkbook
     * @param filePath
     * @return
     * @throws IOException
     * </pre>
     */
    private Workbook getWorkbook(String filePath) throws IOException {
        Workbook workbook = null;
        InputStream is = new FileInputStream(filePath);
        if (filePath.endsWith(EXTENSION_XLS)) {
            workbook = new HSSFWorkbook(is);
        } else if (filePath.endsWith(EXTENSION_XLSX)) {
            workbook = new XSSFWorkbook(is);
        }
        return workbook;
    }

    /**
     * 文件检查
     * @param filePath
     * @throws FileNotFoundException
     * @throws FileFormatException
     */
    private void preReadCheck(String filePath) throws FileNotFoundException, FileFormatException {
        // 常规检查
        File file = new File(filePath);
        if (!file.exists()) {
            throw new FileNotFoundException("传入的文件不存在：" + filePath);
        }

        if (!(filePath.endsWith(EXTENSION_XLS) || filePath.endsWith(EXTENSION_XLSX))) {
            throw new FileFormatException("传入的文件不是excel");
        }
    }

    /**
     * 读取excel文件内容
     * @param filePath
     * @throws FileNotFoundException
     * @throws FileFormatException
     */
    public void readExcel(String filePath) throws FileNotFoundException, FileFormatException {
        // 检查
        this.preReadCheck(filePath);
        // 获取workbook对象
        Workbook workbook = null;
        Sheet sheet = null;
        //利用已经创建的Excel工作薄,创建新的可写入的Excel工作薄   
        OutputStream os = new FileOutputStream("F:/红楼人物1.xlsx");
        try {
            workbook = this.getWorkbook(filePath);
            // 读文件 一个sheet一个sheet地读取
            for (int numSheet = 0; numSheet < workbook.getNumberOfSheets(); numSheet++) {
                 sheet = workbook.getSheetAt(numSheet);
                if (sheet == null) {
                    continue;
                }
                System.out.println("=======================" + sheet.getSheetName() + "=========================");

                int firstRowIndex = sheet.getFirstRowNum();
                int lastRowIndex = sheet.getLastRowNum();

                // 读取首行 即,表头
                Row firstRow = sheet.getRow(firstRowIndex);
                for (int i = firstRow.getFirstCellNum(); i <= firstRow.getLastCellNum(); i++) {
                    Cell cell = firstRow.getCell(i);
                    String cellValue = this.getCellValue(cell, true);
                    System.out.print(" " + cellValue + "\t");
                }
                System.out.println("");
                
                
                
//                
//                //工作区     
//                  XSSFWorkbook wb = new XSSFWorkbook();     
//                  XSSFSheet sheet001= wb.createSheet(sheet.getSheetName());
//                  //如果循环超过10172次，则报内存溢出，有谁循环超过10万次不报错，麻烦请告诉我，这样是因为可以一次性导出大量数据  
//                  for(int rowIndex001 = firstRowIndex + 1; rowIndex001 <= lastRowIndex; rowIndex001++){  
//                      
//                      //创建第一个sheet     
//                      //生成第一行     
//                      XSSFRow row = sheet001.createRow(rowIndex001);  
//                      int firstColumnIndex001 = row.getFirstCellNum(); // 首列
//                      int lastColumnIndex001 = row.getLastCellNum();// 最后一列
//                      for (int columnIndex = firstColumnIndex001; columnIndex <= lastColumnIndex001; columnIndex++) {
//                          Cell currentCell = row.getCell(columnIndex);// 当前单元格               
//                      //给这一行的第一列赋值     
//                      row.createCell(0).setCellValue(this.getCellValue(currentCell, true));       
//                 
//                  }   
//                  try {
//                      //写文件     
//                      wb.write(os);
//                      wb.close();
//                      //关闭输出流     
//                      os.close();
//                  } catch (IOException e) {
//                      // TODO Auto-generated catch block
//                      e.printStackTrace();
//                  }

                  
                  
                  
                  
                  
                // 读取数据行
                for (int rowIndex = firstRowIndex + 1; rowIndex <= lastRowIndex; rowIndex++) {
                    Row currentRow = sheet.getRow(rowIndex);// 当前行
                    int firstColumnIndex = currentRow.getFirstCellNum(); // 首列
                    int lastColumnIndex = currentRow.getLastCellNum();// 最后一列
                    for (int columnIndex = firstColumnIndex; columnIndex <= lastColumnIndex; columnIndex++) {
                        Cell currentCell = currentRow.getCell(columnIndex);// 当前单元格
                        String currentCellValue = this.getCellValue(currentCell, true);// 当前单元格的值
                        System.out.print(currentCellValue + "\t");
                    }
                    System.out.println("");
                }
                System.out.println("======================================================");
            }
            
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        
      

     
        
      
    

    /**
     * 取单元格的值
     * @param cell 单元格对象
     * @param treatAsStr 为true时，当做文本来取值 (取到的是文本，不会把“1”取成“1.0”)
     * @return
     */
    private String getCellValue(Cell cell, boolean treatAsStr) {
        if (cell == null) {
            return "";
        }

        if (treatAsStr) {
            // 虽然excel中设置的都是文本，但是数字文本还被读错，如“1”取成“1.0”
            // 加上下面这句，临时把它当做文本来读取
            cell.setCellType(Cell.CELL_TYPE_STRING);
        }

        if (cell.getCellType() == Cell.CELL_TYPE_BOOLEAN) {
            return String.valueOf(cell.getBooleanCellValue());
        } else if (cell.getCellType() == Cell.CELL_TYPE_NUMERIC) {
            return String.valueOf(cell.getNumericCellValue());
        } else {
            return String.valueOf(cell.getStringCellValue());
        }
    }
    

}