进来利用POI操作Excel解析数据，遇到问题，最主要的就是版本的事情。03版的07版等更高版本。03版本的Excel后缀是 .xls,07+版本的后缀是 .xlsx,对于不同的版本要做不同的处理，否则会出现版本解析错误。话不多说，直接代码。

一：导入的jar包

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.List;

import org.apache.poi.hssf.record.pivottable.StreamIDRecord;
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;

/**
 * 
 * Title:DoExcel
 * Description
 */
public class DoExcel {

    private final static String excel2003L =".xls";    //2003- 版本的excel
    private final static String excel2007U =".xlsx";   //2007+ 版本的excel
    public static void main(String[] args) throws Exception {
    	DoExcel doExcel=new DoExcel();
    	File file=new File("C:\\Users\\Administrator\\Desktop\\testFiles\\2017-12-12_uid-file_path.xlsx");
    	String fileName=file.getName();
		try {
			InputStream inputStream=new FileInputStream(file);
			ArrayList< List<Object>> list=(ArrayList<List<Object>>) doExcel.getBankListByExcel(inputStream, fileName);
			for (int i = 0; i < list.size(); i++) {
				List<Object> myList=list.get(i);
				for (int j = 0; j < myList.size(); j++) {
					String aa=(String) myList.get(j);
					System.out.println(aa);
				}
			}
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
    /**
     * 得到Excel中的行内容
     * @param path
     * @return
     * @throws Exception
     */
public static ArrayList<String> getExcelContentList(String path) throws Exception{
	ArrayList< String> excelList=new ArrayList<>();
	DoExcel doExcel=new DoExcel();
	File file=new File(path);
	String fileName=file.getName();
	try {
		InputStream inputStream=new FileInputStream(file);
		ArrayList< List<Object>> list=(ArrayList<List<Object>>) doExcel.getBankListByExcel(inputStream, fileName);
		for (int i = 0; i < list.size(); i++) {
			List<Object> myList=list.get(i);
			for (int j = 0; j < myList.size(); j++) {
				String aa=(String) myList.get(j);
				excelList.add(aa);
				//System.out.println(aa);
			}
		}
	} catch (FileNotFoundException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}
	return excelList;
	
}
    /**
     * 获取IO流中的数据，组装成List<List<Object>>对象
     * @param in,fileName
     * @return
     * @throws Exception
     */
    public List<List<Object>> getBankListByExcel(InputStream in,String fileName) throws Exception{
        List<List<Object>> list = null;

        //创建Excel工作薄
        Workbook work = null;
        try {
            work = this.getWorkbook(in,fileName);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        if(null == work){
            throw new Exception("创建Excel工作薄为空!");
        }
        Sheet sheet = null;
        Row row = null;
        Cell cell = null;

        list = new ArrayList<List<Object>>();
        //遍历Excel中第一页sheet
        sheet = work.getSheetAt(0);
        if (sheet == null) {
            throw new Exception("Excel工作薄为空!");
        }
        //遍历当前sheet中的所有行
        for (int j = 1; j <= sheet.getLastRowNum(); j++) {
            row = sheet.getRow(j);

            if(row==null){
                continue;
            }

            //遍历所有的列
            List<Object> li = new ArrayList<Object>();
            for (int y = row.getFirstCellNum()+1; y < row.getLastCellNum(); y++) {
                cell = row.getCell(y);
                Object value = this.getCellValue(cell);

                if(null != value){

                    li.add(value);
                }
            }
            list.add(li);
        }
        try {
            in.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return list;
    }

    /**
     * 根据文件后缀，自适应上传文件的版本
     * @param inStr,fileName
     * @return
     * @throws Exception
     */
    public Workbook getWorkbook(InputStream inStr,String fileName) throws Exception{
        Workbook wb = null;
        String fileType = fileName.substring(fileName.lastIndexOf("."));
        if(excel2003L.equals(fileType)){
            wb = new HSSFWorkbook(inStr);  //2003-
        }else if(excel2007U.equals(fileType)){
            wb = new XSSFWorkbook(inStr);  //2007+
        }else{
            throw new Exception("解析的文件格式有误!");
        }
        return wb;
    }

    /**
     * 对表格中数值进行格式化
     * @param cell
     * @return
     */
    public Object getCellValue(Cell cell){
        Object value = null;
        DecimalFormat df = new DecimalFormat("0");  //格式化number String字符
        SimpleDateFormat sdf = new SimpleDateFormat("yyy-MM-dd");  //日期格式化
        DecimalFormat df2 = new DecimalFormat("0.00");  //格式化数字

        switch (cell.getCellType()) {
        case Cell.CELL_TYPE_STRING:
            value = cell.getRichStringCellValue().getString();
            break;
        case Cell.CELL_TYPE_NUMERIC:
            if("General".equals(cell.getCellStyle().getDataFormatString())){
                value = df.format(cell.getNumericCellValue());
            }else if("m/d/yy".equals(cell.getCellStyle().getDataFormatString())){
                value = sdf.format(cell.getDateCellValue());
            }else{
                value = df2.format(cell.getNumericCellValue());
            }
            break;
        case Cell.CELL_TYPE_BOOLEAN:
            value = cell.getBooleanCellValue();
            break;
        case Cell.CELL_TYPE_BLANK:
            value = "";
            break;
        default:
            break;
        }
        return value;
    }

}