第一步：在maven中导入poi相关的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>
<!-- 支持Word文档的操作 -->
<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;



    /**
     * 读取Excel表格表头的内容
     *
     * @param
     * @return String 表头内容的数组
     * @author zengwendong
     */
    public static String[] readExcelTitle(Workbook wb) throws Exception{
        if(wb==null){
            throw new Exception("Workbook对象为空！");
        }
        sheet = wb.getSheetAt(0);
        row = sheet.getRow(0);
        // 标题总列数
        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;
    }

    /**
     * 读取Excel数据内容
     *
     * @param
     * @return Map 包含单元格数据内容的Map对象
     * @author zengwendong
     */
    public static List<Map> readExcelContent(Workbook wb) throws Exception{
        if(wb==null){
            throw new Exception("Workbook对象为空！");
        }
       List<Map> content = new ArrayList<Map>();

        sheet = wb.getSheetAt(0);
        // 得到总行数
        int rowNum = sheet.getLastRowNum();
        row = sheet.getRow(0);
        int colNum = row.getPhysicalNumberOfCells();
        // 正文内容应该从第二行开始,第一行为表头的标题
        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;
    }

    /**
     *
     * 根据Cell类型设置数据
     *
     * @param cell
     * @return
     * @author zengwendong
     */
    private static Object getCellFormatValue(Cell cell) {
        Object cellvalue = "";
        if (cell != null) {
            // 判断当前Cell的Type
            switch (cell.getCellType()) {
                case Cell.CELL_TYPE_NUMERIC:// 如果当前Cell的Type为NUMERIC
                case Cell.CELL_TYPE_FORMULA: {
                    // 判断当前的cell是否为Date
                    if (DateUtil.isCellDateFormatted(cell)) {
                        // 如果是Date类型则，转化为Data格式
                        // data格式是带时分秒的：2013-7-10 0:00:00
                        // cellvalue = cell.getDateCellValue().toLocaleString();
                        // data格式是不带带时分秒的：2013-7-10
                        Date date = cell.getDateCellValue();
                        cellvalue = date;
                    } else {// 如果是纯数字

                        // 取得当前Cell的数值
                        cellvalue = String.valueOf(cell.getNumericCellValue());
                    }
                    break;
                }
                case Cell.CELL_TYPE_STRING:// 如果当前Cell的Type为STRING
                    // 取得当前的Cell字符串
                    cellvalue = cell.getRichStringCellValue().getString();
                    break;
                default:// 默认的Cell值
                    cellvalue = "";
            }
        } else {
            cellvalue = "";
        }
        return cellvalue;
    }

    /**
     * 根据路径解析文档
     * @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;
    }
}

}