第一步：在maven中匯入poi相關的jar

<dependency><groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml</artifactId>
    <version>3.9</version>
</dependency>
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi</artifactId
 
>
    <version>3.9</version>
</dependency>
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml-schemas</artifactId>
    <version>3.9</version>
</dependency>
<!-- 支援Word文件的操作 -->
<dependency>
    <groupId
 
>org.apache.poi</groupId>
    <artifactId>poi-scratchpad</artifactId>
    <version>3.9</version>
</dependency>

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import 
 
org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.*;

/**
 * Created by fanjunwei on 2017/2/14.
 */
public class excel{
    private static Logger logger = LoggerFactory.getLogger(World1.class);
    private static Workbook wb;
    private static Sheet sheet;
    private static Row row;



    /**
     * 讀取Excel表格表頭的內容
     *
     * @param
* @return String 表頭內容的陣列
     * @author zengwendong
     */
public static String[] readExcelTitle(Workbook wb) throws Exception{
        if(wb==null){
            throw new Exception("Workbook物件為空！");
        }
        sheet = wb.getSheetAt(0);
        row = sheet.getRow(0);
        // 標題總列數
int colNum = row.getPhysicalNumberOfCells();
        System.out.println("colNum:" + colNum);
        String[] title = new String[colNum];
        for (int i = 0; i < colNum; i++) {
            // title[i] = getStringCellValue(row.getCell((short) i));
title[i] = row.getCell(i).getCellFormula();
        }
        return title;
    }

    /**
     * 讀取Excel資料內容
     *
     * @param
* @return Map 包含單元格資料內容的Map物件
     * @author zengwendong
     */
public static List<Map> readExcelContent(Workbook wb) throws Exception{
        if(wb==null){
            throw new Exception("Workbook物件為空！");
        }
       List<Map> content = new ArrayList<Map>();

        sheet = wb.getSheetAt(0);
        // 得到總行數
int rowNum = sheet.getLastRowNum();
        row = sheet.getRow(0);
        int colNum = row.getPhysicalNumberOfCells();
        // 正文內容應該從第二行開始,第一行為表頭的標題
for (int i = 1; i <= rowNum; i++) {
            row = sheet.getRow(i);
            int j = 0;
            Map<String,Object> cellValue = new HashMap<String, Object>();
            while (j < colNum) {
                Object obj = getCellFormatValue(row.getCell(j));
             
                cellValue.put(j, obj);

                j++;
            }
            content.add(cellValue);
        }
        return content;
    }

    /**
     *
     * 根據Cell型別設定資料
     *
     * @param cell
* @return
* @author zengwendong
     */
private static Object getCellFormatValue(Cell cell) {
        Object cellvalue = "";
        if (cell != null) {
            // 判斷當前Cell的Type
switch (cell.getCellType()) {
                case Cell.CELL_TYPE_NUMERIC:// 如果當前Cell的Type為NUMERIC
case Cell.CELL_TYPE_FORMULA: {
                    // 判斷當前的cell是否為Date
if (DateUtil.isCellDateFormatted(cell)) {
                        // 如果是Date型別則，轉化為Data格式
                        // data格式是帶時分秒的：2013-7-10 0:00:00
                        // cellvalue = cell.getDateCellValue().toLocaleString();
                        // data格式是不帶帶時分秒的：2013-7-10
Date date = cell.getDateCellValue();
                        cellvalue = date;
                    } else {// 如果是純數字
                        // 取得當前Cell的數值
cellvalue = String.valueOf(cell.getNumericCellValue());
                    }
                    break;
                }
                case Cell.CELL_TYPE_STRING:// 如果當前Cell的Type為STRING
                    // 取得當前的Cell字串
cellvalue = cell.getRichStringCellValue().getString();
                    break;
                default:// 預設的Cell值
cellvalue = "";
            }
        } else {
            cellvalue = "";
        }
        return cellvalue;
    }

    /**
     * 根據路徑解析文件
     * @param url
*/
public static List excel(String url){
    String ext = url.substring(url.lastIndexOf("."));
    try {
        InputStream is = new FileInputStream(url);
        if(".xls".equals(ext)){
            wb = new HSSFWorkbook(is);
        }else if(".xlsx".equals(ext)){
            wb = new XSSFWorkbook(is);
        }else{
            wb=null;
        }
       return  World1.readExcelContent(wb);


    } catch (FileNotFoundException e) {
        logger.error("FileNotFoundException", e);
        return null;
    } catch (IOException e) {
        logger.error("IOException", e);
        return null;
    }catch (Exception e){
        logger.error("Exception", e);
        return null;
    }
}
}