java中的excel操作

   导入jxl.jar包： 下载个jxl.jar包，然后这个包放在什么位置都行,在你的项目中导入这个包就可以.  
　具体做法: 

　　项目上右键，点击“属性”，
　　类别那里选择”库“，点击"添加jar文件”
　　在弹出的文件选择对话框选择你的jxl.jar就OK了

package publicData;

/*
 * Created on 2013-12-5
 *
 * TODO To change the template for this generated file go to
 * Window - Preferences - Java - Code Style - Code Templates
 */

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Date;
import java.util.List;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
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;

public class InputExcel {
    
    //public static String[][] result;
  
  /*
  public static void main(String[] args) {

    String path="C:\\Users\\pclxz\\Desktop\\心协软件\\初品4(在这修改)\\首访记录.xls";//文件路径
    try {
      File files = new File(path);
      String[][] result = getData(files, 2);
      if (result != null) {
        int rowLength = result.length;
        for (int i = 0; i < rowLength; i++) {
          for (int j = 0; j < result[i].length; j++) {
            System.out.println(result[i][j]+"单元格ID:"+i+" "+j);
          }
          System.out.println();
        }
      }
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
  */
  
  public static void  getExcel(String[][] result, String path) {

      try {
          File files = new File(path);
          result = getData(files, 2);
        } catch (Exception e) {
          e.printStackTrace();
        }
  }
  
  public static String[][] getData(File file, int firstrow) 
          throws FileNotFoundException, IOException {
  
    List<String[]> result = new ArrayList<String[]>();
    int rowSize = 0;
    BufferedInputStream in = new BufferedInputStream(new FileInputStream(file));
    POIFSFileSystem fs = new POIFSFileSystem(in);
    HSSFWorkbook wb = new HSSFWorkbook(fs);//工作表
    HSSFCell cell = null;
    //遍历工作表里的所有工作簿
    for (int sheetIndex = 0; sheetIndex < wb.getNumberOfSheets(); sheetIndex++) {
  
    HSSFSheet st = wb.getSheetAt(sheetIndex);    //得到工作簿
    //遍历工作簿st的row
    for (int rowIndex = firstrow; rowIndex <= st.getLastRowNum(); rowIndex++) {
    
      HSSFRow row = st.getRow(rowIndex);//row
      if (row == null) {
          continue;
      }
      
      //int tempRowSize = row.getLastCellNum() + 1;//该row的数组大小
      int tempRowSize = row.getLastCellNum() ;//该row的数组大小
      if (tempRowSize > rowSize) {
        rowSize = tempRowSize;
      }
    //System.out.println(rowSize);     
    String[] values = new String[rowSize];//存放一个row的实例
    Arrays.fill(values, "");
    boolean hasValue = false;
    //读取一个row的实例并存放进values
    //System.out.println(row.getLastCellNum()); 
    for (short columnIndex = 0; columnIndex < row.getLastCellNum(); columnIndex++) {
      String value = "";
      cell = row.getCell(columnIndex);//row对应column的单元格cell
      //判断cell类型并相应存储
      if (cell != null) {
        switch (cell.getCellType()) {
        case HSSFCell.CELL_TYPE_STRING://读取的格式为字符串
          value = cell.getStringCellValue();
          break;
        case HSSFCell.CELL_TYPE_NUMERIC://读取的格式为数组
          //如果格式为日期格式，自定义格式输出
          if (HSSFDateUtil.isCellDateFormatted(cell)) {
            Date date = cell.getDateCellValue();
            if (date != null) {
              value = new SimpleDateFormat("yyyy-MM-dd")
                  .format(date);
            } else {
              value = "";
            }
          } else {
            //如果格式为数值，自定义格式输出
            value = new DecimalFormat("0.00").format(cell
                .getNumericCellValue());
          }
          break;
        case HSSFCell.CELL_TYPE_FORMULA:
          // 导入时如果为公式生成的数据则无值
          value = "";
          break;
          // 导入时如果为空
        case HSSFCell.CELL_TYPE_BLANK:
          break;
        case HSSFCell.CELL_TYPE_ERROR:
          value = "";
          break;
          // 导入时如果为BOOLEAN型 自定义格式输出
        case HSSFCell.CELL_TYPE_BOOLEAN:
          value = (cell.getBooleanCellValue() == true ? "Y"
              : "N");
          break;
        default:
          value = "";
        }
      }

      values[columnIndex] = rightTrim(value);//去掉字符串右边的空格，并赋值
      hasValue = true;
    }

    //一个row的实例values存入result
    if (hasValue) {
      result.add(values);
    }
  
  }

  in.close();
  String[][] returnArray = new String[result.size()][rowSize];
  for (int i = 0; i < returnArray.length; i++) {
    returnArray[i] = (String[]) result.get(i);
  }
    return returnArray;
    }
  return null;

  }

  /**
   * 去掉字符串右边的空格
   * 
   * @param str 要处理的字符串
   * @return 处理后的字符串
   */
  public static String rightTrim(String str) {
    if (str == null) {
      return "";
    }
    int length = str.length();
    for (int i = length - 1; i >= 0; i--) {
      if (str.charAt(i) != 0x20) {
        break;
      }
      length--;
    }
    return str.substring(0, length);
  }

  
}