java 读取 Excel 读取 兼容2003,2007

需要jar包 ，至少要这几种
poi-3.7-20101029.jar
poi-ooxml-3.7-20101029.jar
poi-ooxml-schemas-3.7-20101029.jar
xmlbeans-2.3.0.jar

package com.yiwanj.core.util;

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.LinkedList;
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.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class ExcelUtil {
    
    public static void main(String[] args) {
        File file = new File("D:\\Tomcat 6\\webapps\\export\\upload\\Book1.xlsx");
        try {
            List list = readExcel(file);
            for (int i = 0; i < list.size(); i++) {
                List one = (List) list.get(i);
                System.out.println(one.get(0));
                System.out.println(one.get(1));
                System.out.println(one.get(2));
                System.out.println(one.get(3));
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
     /**
     * 对外提供读取excel 的方法
     * */
public static List<List<Object>> readExcel(File file) throws IOException{
   String fileName = file.getName();
   String extension = fileName.lastIndexOf(".")==-1?"":fileName.substring(fileName.lastIndexOf(".")+1);
   if("xls".equals(extension)){
    return read2003Excel(file);
   }else if("xlsx".equals(extension)){
    return read2007Excel(file);
   }else{
    throw new IOException("不支持的文件类型");  
   }
}
/**
* 读取 office 2003 excel
* @throws IOException 
* @throws FileNotFoundException */
private static List<List<Object>> read2003Excel(File file) throws IOException{
   List<List<Object>> list = new LinkedList<List<Object>>();
   HSSFWorkbook hwb = new HSSFWorkbook(new FileInputStream(file));
   HSSFSheet sheet = hwb.getSheetAt(0);
   Object value = null;
   HSSFRow row = null;
   HSSFCell cell = null; 
   for(int i = sheet.getFirstRowNum();i<= sheet.getPhysicalNumberOfRows();i++){
    row = sheet.getRow(i);
    if (row == null) {
     continue;
    }
    List<Object> linked = new LinkedList<Object>();
    for (int j = row.getFirstCellNum(); j <= row.getLastCellNum(); j++) {
     cell = row.getCell(j);
     if (cell == null) {
      continue;
     }
     DecimalFormat df = new DecimalFormat("0");// 格式化 number String 字符
     SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");// 格式化日期字符串
     DecimalFormat nf = new DecimalFormat("0.00");// 格式化数字
     switch (cell.getCellType()) {
     case XSSFCell.CELL_TYPE_STRING:
      System.out.println(i+"行"+j+" 列 is String type");
      value = cell.getStringCellValue();
      break;
     case XSSFCell.CELL_TYPE_NUMERIC:
      System.out.println(i+"行"+j+" 列 is Number type ; DateFormt:"+cell.getCellStyle().getDataFormatString());
      if("@".equals(cell.getCellStyle().getDataFormatString())){
         value = df.format(cell.getNumericCellValue());
      } else if("General".equals(cell.getCellStyle().getDataFormatString())){
         value = nf.format(cell.getNumericCellValue());
      }else{
        value = sdf.format(HSSFDateUtil.getJavaDate(cell.getNumericCellValue()));
      }
      break;
     case XSSFCell.CELL_TYPE_BOOLEAN:
      System.out.println(i+"行"+j+" 列 is Boolean type");
      value = cell.getBooleanCellValue();
      break;
     case XSSFCell.CELL_TYPE_BLANK:
      System.out.println(i+"行"+j+" 列 is Blank type");
      value = "";
      break;
     default:
      System.out.println(i+"行"+j+" 列 is default type");
      value = cell.toString();
     }
     if (value == null || "".equals(value)) {
      continue;
     }
     linked.add(value);  
   }
    list.add(linked);
   }
   return list;
}
/**
* 读取Office 2007 excel
* */
private static List<List<Object>> read2007Excel(File file) throws IOException {
   List<List<Object>> list = new LinkedList<List<Object>>();
   // 构造 XSSFWorkbook 对象，strPath 传入文件路径
   XSSFWorkbook xwb = new XSSFWorkbook(new FileInputStream(file));
   // 读取第一章表格内容
   XSSFSheet sheet = xwb.getSheetAt(0);
   Object value = null;
   XSSFRow row = null;
   XSSFCell cell = null;
   for (int i = sheet.getFirstRowNum(); i <= sheet
     .getPhysicalNumberOfRows(); i++) {
    row = sheet.getRow(i);
    if (row == null) {
     continue;
    }
    List<Object> linked = new LinkedList<Object>();
    for (int j = row.getFirstCellNum(); j <= row.getLastCellNum(); j++) {
     cell = row.getCell(j);
     if (cell == null) {
      continue;
     }
     DecimalFormat df = new DecimalFormat("0");// 格式化 number String 字符
     SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");// 格式化日期字符串
     DecimalFormat nf = new DecimalFormat("0.00");// 格式化数字
     switch (cell.getCellType()) {
     case XSSFCell.CELL_TYPE_STRING:
      System.out.println(i+"行"+j+" 列 is String type");
      value = cell.getStringCellValue();
      break;
     case XSSFCell.CELL_TYPE_NUMERIC:
      System.out.println(i+"行"+j+" 列 is Number type ; DateFormt:"+cell.getCellStyle().getDataFormatString());
      if("@".equals(cell.getCellStyle().getDataFormatString())){
        value = df.format(cell.getNumericCellValue());
      } else if("General".equals(cell.getCellStyle().getDataFormatString())){
        value = nf.format(cell.getNumericCellValue());
      }else{
       value = sdf.format(HSSFDateUtil.getJavaDate(cell.getNumericCellValue()));
      }
      break;
     case XSSFCell.CELL_TYPE_BOOLEAN:
      System.out.println(i+"行"+j+" 列 is Boolean type");
      value = cell.getBooleanCellValue();
      break;
     case XSSFCell.CELL_TYPE_BLANK:
      System.out.println(i+"行"+j+" 列 is Blank type");
      value = "";
      break;
     default:
      System.out.println(i+"行"+j+" 列 is default type");
      value = cell.toString();
     }
     if (value == null || "".equals(value)) {
      continue;
     }
     linked.add(value);
    }
    list.add(linked);
   }
   return list;
}
}