java读写excel文件实现POI解析Excel的方法

package com.zhx.base.utils;

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

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

/**
 * POI解析Excel
 */
public class ExcelReaderUtil {

  /**
   * 根据fileType不同读取excel文件
   *
   * @param path
   * @param path
   * @throws IOException
   */
  public static List<List<String>> readExcel(String path) {
    String fileType = path.substring(path.lastIndexOf(".") + 1);
    // return a list contains many list
    List<List<String>> lists = new ArrayList<List<String>>();
    //读取excel文件
    InputStream is = null;
    try {
      is = new FileInputStream(path);
      //获取工作薄
      Workbook wb = null;
      if (fileType.equals("xls")) {
        wb = new HSSFWorkbook(is);
      } else if (fileType.equals("xlsx")) {
        wb = new XSSFWorkbook(is);
      } else {
        return null;
      }

      //读取第一个工作页sheet
      Sheet sheet = wb.getSheetAt(0);
      //第一行为标题
      for (Row row : sheet) {
        ArrayList<String> list = new ArrayList<String>();
        for (Cell cell : row) {
          //根据不同类型转化成字符串
          cell.setCellType(Cell.CELL_TYPE_STRING);
          list.add(cell.getStringCellValue());
        }
        lists.add(list);
      }
    } catch (IOException e) {
      e.printStackTrace();
    } finally {
      try {
        if (is != null) is.close();
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
    return lists;
  }


  /**
   * 创建Excel.xls
   * @param lists 需要写入xls的数据
   * @param titles 列标题
   * @param name 文件名
   * @return
   * @throws IOException
   */
  public static Workbook creatExcel(List<List<String>> lists, String[] titles, String name) throws IOException {
    System.out.println(lists);
    //创建新的工作薄
    Workbook wb = new HSSFWorkbook();
    // 创建第一个sheet（页），并命名
    Sheet sheet = wb.createSheet(name);
    // 手动设置列宽。第一个参数表示要为第几列设；，第二个参数表示列的宽度，n为列高的像素数。
    for(int i=0;i<titles.length;i++){
      sheet.setColumnWidth((short) i, (short) (35.7 * 150));
    }

    // 创建第一行
    Row row = sheet.createRow((short) 0);

    // 创建两种单元格格式
    CellStyle cs = wb.createCellStyle();
    CellStyle cs2 = wb.createCellStyle();

    // 创建两种字体
    Font f = wb.createFont();
    Font f2 = wb.createFont();

    // 创建第一种字体样式（用于列名）
    f.setFontHeightInPoints((short) 10);
    f.setColor(IndexedColors.BLACK.getIndex());
    f.setBoldweight(Font.BOLDWEIGHT_BOLD);

    // 创建第二种字体样式（用于值）
    f2.setFontHeightInPoints((short) 10);
    f2.setColor(IndexedColors.BLACK.getIndex());

    // 设置第一种单元格的样式（用于列名）
    cs.setFont(f);
    cs.setBorderLeft(CellStyle.BORDER_THIN);
    cs.setBorderRight(CellStyle.BORDER_THIN);
    cs.setBorderTop(CellStyle.BORDER_THIN);
    cs.setBorderBottom(CellStyle.BORDER_THIN);
    cs.setAlignment(CellStyle.ALIGN_CENTER);

    // 设置第二种单元格的样式（用于值）
    cs2.setFont(f2);
    cs2.setBorderLeft(CellStyle.BORDER_THIN);
    cs2.setBorderRight(CellStyle.BORDER_THIN);
    cs2.setBorderTop(CellStyle.BORDER_THIN);
    cs2.setBorderBottom(CellStyle.BORDER_THIN);
    cs2.setAlignment(CellStyle.ALIGN_CENTER);
    //设置列名
    for(int i=0;i<titles.length;i++){
      Cell cell = row.createCell(i);
      cell.setCellValue(titles[i]);
      cell.setCellStyle(cs);
    }
    if(lists == null || lists.size() == 0){
      return wb;
    }
    //设置每行每列的值
    for (short i = 1; i <= lists.size(); i++) {
      // Row 行,Cell 方格 , Row 和 Cell 都是从0开始计数的
      // 创建一行，在页sheet上
      Row row1 = sheet.createRow((short)i);
      for(short j=0;j<titles.length;j++){
        // 在row行上创建一个方格
        Cell cell = row1.createCell(j);
        cell.setCellValue(lists.get(i-1).get(j));
        cell.setCellStyle(cs2);
      }
    }
    return wb;
  }

  public static void main(String[] args) {
    String path = "d:/software/企发支付-员工信息表.xlsx";
    List<List<String>> lists = readExcel(path);
    for (List<String> list : lists) {
      for (String strs : list) {
        System.out.println(strs);
      }
    }
  }
}

 <!-- POI EXCEL 文件读写 -->
    <dependency>
      <groupId>org.apache.poi</groupId>
      <artifactId>poi-excelant</artifactId>
      <version>3.14</version>
    </dependency>

public Map insEm(File file) throws FileNotFoundException {
    String companyName = "";
    String epid = "";
    List<Map> listMap = new ArrayList<>();
    List<List<String>> lists = ExcelReaderUtil.readExcel(file.getPath());
    for (int j = 0; j < lists.size(); j++) {
      List list = lists.get(j);
      for (int i = 0; i < list.size(); i++) {
        if (list.get(i).equals("企业名称")) {
          companyName = list.get(i + 1).toString();
          epid = employeeMapper.selEPID(companyName);
          break;
        } else if (list.get(i).equals("员工识别号")) {
          for (int m = j + 1; m < lists.size() - 1; m++) {
            Map map = new HashMap();
            if (null != lists.get(m) && lists.get(m).size() > 0) {
              List dataList = lists.get(m);
              map.put("id", dataList.get(0));
              map.put("epid", epid);
              map.put("name", dataList.get(1));
              map.put("identify", dataList.get(2));
              listMap.add(map);
            }
          }
        }
      }
    }
    Map dataMap = new HashMap();
    dataMap.put("employees", listMap);
    employeeMapper.insEm(dataMap);
    return null;
  }

<insert id="insEm" parameterType="java.util.Map">
    insert into qf_employee_info(epid,employee_id,user_name,phone,user_email,status,create_time,creater,create_type) value
    <foreach collection="employees" index="index" item="item" separator=",">
      (#{item.epid},"",#{item.name},#{item.identify},"",1,now(),"",2)
    </foreach>
  </insert>