POI实现excel的导入导出-[未采用反射实现的版本]

最近在做项目中遇到了使用POI导入导出excel的需求,所以在这里总结下，方便自己和朋友学习:
1.经典博客:
1.JavaWEB–POI之EXCEL操作、优化、封装详解系列（一）–概述与原理
2.公共POI导出Excel方法–java
3.Apache POI 实现对 Excel 文件读写
4.EasyPoi教程V1.0

2.原理:
原理如下图

3.代码:
POIController.java

package com.spring.boot.gp4zj.controller;

import javax.servlet.http.HttpServletResponse;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.spring.boot.gp4zj.service.POIService;

import cn.lz.cloud.common.service.ClazzNote;
import cn.lz.cloud.common.service.ServiceNote;

/**
 * 各种poi导入导出的请求控制模块;
 * 
 * @author:JunZhou
 * @Company:LongZheng
 * @Email:[email protected]
 * @2018年1月16日@下午4:28:49
 */
@RestController
@RequestMapping("/poi")
@ClazzNote(desc = "excel文件", resource = "input", modName = "poi")
public class POIController {
    @Autowired
    private POIService poiService;

    // 获取考勤明细的excel文件;
    @RequestMapping("/getAttenceDetailExcel")
    @ServiceNote(desc = "获取考勤明细的excel", auth = ServiceNote.AUTH.CHECK)
    public void getAttenceDetailExcel(HttpServletResponse response) {
        poiService.getAttenceDetailExcel(response);

    }

    // 读取考勤明细的excel文件;
    @RequestMapping("/readAttenceDetailData")
    @ServiceNote(desc = "获取考勤明细的excel", auth = ServiceNote.AUTH.CHECK)
    public void readAttenceDetailData() {


    }

}

POIServiceImpl.java

package com.spring.boot.gp4zj.service.impl;

import java.io.IOException;
import java.io.OutputStream;
import java.util.List;

import javax.servlet.http.HttpServletResponse;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.spring.boot.gp4zj.model.AttenceDetail;
import com.spring.boot.gp4zj.model.SimulationVO;
import com.spring.boot.gp4zj.service.AttenceDetailService;
import com.spring.boot.gp4zj.service.POIService;
import com.spring.boot.gp4zj.util.POIUtils;

import cn.lz.cloud.common.service.ResList;

/**
 * 获取excel的业务逻辑模块;
 * @author:JunZhou
 * @Company:LongZheng
 * @Email:[email protected]
 * @2018年1月16日@下午4:47:09
 */
@Service
public class POIServiceImpl implements POIService {

    @Autowired
    private AttenceDetailService attenceDetailService;
    public void getAttenceDetailExcel(HttpServletResponse response) {
        // TODO Auto-generated method stub
        ResList  list = attenceDetailService.selectAll(SimulationVO.getADSimulationVo());
        List excelData = list.getList();
        HSSFWorkbook workbook = POIUtils.createExcel(excelData);
        OutputStream out = null;
        if (workbook != null) {
            try {
                String fileName = "Excel-" + String.valueOf(System.currentTimeMillis()).substring(4, 13) + ".xls";
                String headStr = "attachment; filename=\"" + fileName + "\"";
                response.setContentType("APPLICATION/OCTET-STREAM");
                response.setHeader("Content-Disposition", headStr);
                out = response.getOutputStream();
                workbook.write(out);
                out.flush();
                out.close();
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                try {
                    out.flush();
                    out.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }

    }

}

POIUtils.java

package com.spring.boot.gp4zj.util;

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

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;

import com.spring.boot.gp4zj.model.AttenceDetail;

/**
 * Excel操作相关的工具类;
 * 
 * @author:JunZhou
 * @Company:LongZheng
 * @Email:[email protected]
 * @2018年1月16日@下午3:19:25
 */
public class POIUtils {
    public static void main(String[] args) {
        List list = readExcel();
        /*for (int i = 0; i < list.size(); i++) {
            System.out.println(list.get(i).toString());
        }*/
        System.out.println(list.get(0).toString());
    }
    /**
     * 创建Excel
     * 
     * @param list
     *            数据
     */
    public static HSSFWorkbook createExcel(List list) {
        // 创建一个Excel文件
        HSSFWorkbook workbook = new HSSFWorkbook();
        // 创建一个工作表
        HSSFSheet sheet = workbook.createSheet("考勤明细表");
        // 添加表头行
        HSSFRow hssfRow = sheet.createRow(0);
        // 设置单元格格式居中
        HSSFCellStyle cellStyle = workbook.createCellStyle();
        cellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        // 添加表头内容
        // -------第一行第0-2列---------
        HSSFCell headCell = hssfRow.createCell(0);
        headCell.setCellValue("考勤日期");
        headCell.setCellStyle(cellStyle);

        headCell = hssfRow.createCell(1);
        headCell.setCellValue("考勤名称");
        headCell.setCellStyle(cellStyle);

        headCell = hssfRow.createCell(2);
        headCell.setCellValue("员工编码");
        headCell.setCellStyle(cellStyle);

        // -----------------------
        headCell = hssfRow.createCell(3);
        headCell.setCellValue("出勤时长");
        headCell.setCellStyle(cellStyle);

        headCell = hssfRow.createCell(4);
        headCell.setCellValue("加班时长");
        headCell.setCellStyle(cellStyle);

        headCell = hssfRow.createCell(5);
        headCell.setCellValue("合计出勤时长");
        headCell.setCellStyle(cellStyle);

        // -----------------------
        headCell = hssfRow.createCell(6);
        headCell.setCellValue("报工单位");
        headCell.setCellStyle(cellStyle);

        headCell = hssfRow.createCell(7);
        headCell.setCellValue("结算单位");
        headCell.setCellStyle(cellStyle);

        headCell = hssfRow.createCell(8);
        headCell.setCellValue("创建人");
        headCell.setCellStyle(cellStyle);

        // -----------------------
        headCell = hssfRow.createCell(9);
        headCell.setCellValue("出勤人天");
        headCell.setCellStyle(cellStyle);

        headCell = hssfRow.createCell(10);
        headCell.setCellValue("加班人天");
        headCell.setCellStyle(cellStyle);

        headCell = hssfRow.createCell(11);
        headCell.setCellValue("合计人天");
        headCell.setCellStyle(cellStyle);

        // -----------------------
        headCell = hssfRow.createCell(12);
        headCell.setCellValue("是否删除汇总表");
        headCell.setCellStyle(cellStyle);

        headCell = hssfRow.createCell(13);
        headCell.setCellValue("是否确认");
        headCell.setCellStyle(cellStyle);

        headCell = hssfRow.createCell(14);
        headCell.setCellValue("创建时间");
        headCell.setCellStyle(cellStyle);

        // -----------------------
        headCell = hssfRow.createCell(15);
        headCell.setCellValue("修改时间");
        headCell.setCellStyle(cellStyle);

        // 添加数据内容
        for (int i = 0; i < list.size(); i++) {
            hssfRow = sheet.createRow((int) i + 1);
            AttenceDetail attenceDetail = list.get(i);
            // 创建单元格，并设置值

            HSSFCell cell = hssfRow.createCell(0);
            cell.setCellValue(attenceDetail.getAttencedTime());
            cell.setCellStyle(cellStyle);

            cell = hssfRow.createCell(1);
            cell.setCellValue(attenceDetail.getAttencerName());
            cell.setCellStyle(cellStyle);

            cell = hssfRow.createCell(2);
            cell.setCellValue(attenceDetail.getAttencerCode());
            cell.setCellStyle(cellStyle);

            cell = hssfRow.createCell(3);
            cell.setCellValue(attenceDetail.getWorkTimeLen());
            cell.setCellStyle(cellStyle);

            cell = hssfRow.createCell(4);
            cell.setCellValue(attenceDetail.getExtraTimeLen());
            cell.setCellStyle(cellStyle);

            cell = hssfRow.createCell(5);
            cell.setCellValue(attenceDetail.getTotalTimeLen());
            cell.setCellStyle(cellStyle);

            cell = hssfRow.createCell(6);
            cell.setCellValue(attenceDetail.getApplyCompany());
            cell.setCellStyle(cellStyle);

            cell = hssfRow.createCell(7);
            cell.setCellValue(attenceDetail.getPayCompany());
            cell.setCellStyle(cellStyle);

            cell = hssfRow.createCell(8);
            cell.setCellValue(attenceDetail.getCreator());
            cell.setCellStyle(cellStyle);

            cell = hssfRow.createCell(9);
            cell.setCellValue(attenceDetail.getWorkDayNum());
            cell.setCellStyle(cellStyle);

            cell = hssfRow.createCell(10);
            cell.setCellValue(attenceDetail.getExtraDayNum());
            cell.setCellStyle(cellStyle);

            cell = hssfRow.createCell(11);
            cell.setCellValue(attenceDetail.getTotalDayNum());
            cell.setCellStyle(cellStyle);

            cell = hssfRow.createCell(12);
            cell.setCellValue(attenceDetail.getIsDelGather());
            cell.setCellStyle(cellStyle);

            cell = hssfRow.createCell(13);
            cell.setCellValue(attenceDetail.getIsConfirmed());
            cell.setCellStyle(cellStyle);

            cell = hssfRow.createCell(14);
            cell.setCellValue(attenceDetail.getCreateTime());
            cell.setCellStyle(cellStyle);

            cell = hssfRow.createCell(15);
            cell.setCellValue(attenceDetail.getEditTime());
            cell.setCellStyle(cellStyle);

        }

        /*// 保存Excel文件
        try {
            OutputStream outputStream = new FileOutputStream("D:/students.xls");
            workbook.write(outputStream);
            outputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }*/
        return workbook;
    }

    /**
     * 接收上传的excel并读取其中的信息;
     */
    public static List readExcel(){

        List list = new ArrayList();
        HSSFWorkbook workbook = null;
        try {
            // 读取Excel文件
            InputStream inputStream = new FileInputStream("D:/Excel-095968073.xls");
            workbook = new HSSFWorkbook(inputStream);
            inputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

        // 循环工作表
        for (int numSheet = 0; numSheet < workbook.getNumberOfSheets(); numSheet++) {
            HSSFSheet hssfSheet = workbook.getSheetAt(numSheet);
            if (hssfSheet == null) {
                continue;
            }
            // 循环行
            for (int rowNum = 1; rowNum <= hssfSheet.getLastRowNum(); rowNum++) {
                HSSFRow hssfRow = hssfSheet.getRow(rowNum);
                if (hssfRow == null) {
                    continue;
                }

                // 将单元格中的内容存入集合
                AttenceDetail attenceDetail = new AttenceDetail();

                HSSFCell cell = hssfRow.getCell(0);
                if (cell == null) {
                    continue;
                }
                attenceDetail.setAttencedTime(cell.getStringCellValue());

                cell = hssfRow.getCell(1);
                if (cell == null) {
                    continue;
                }
                attenceDetail.setAttencerName(cell.getStringCellValue());

                cell = hssfRow.getCell(2);
                if (cell == null) {
                    continue;
                }
                attenceDetail.setAttencerCode(cell.getStringCellValue());
                //-------------------------------
                cell = hssfRow.getCell(3);
                if (cell == null) {
                    continue;
                }
                attenceDetail.setWorkTimeLen(cell.getStringCellValue());

                cell = hssfRow.getCell(4);
                if (cell == null) {
                    continue;
                }
                attenceDetail.setExtraTimeLen(cell.getStringCellValue());

                cell = hssfRow.getCell(5);
                if (cell == null) {
                    continue;
                }
                attenceDetail.setTotalTimeLen(cell.getStringCellValue());

              //-------------------------------
                cell = hssfRow.getCell(6);
                if (cell == null) {
                    continue;
                }
                attenceDetail.setApplyCompany(cell.getStringCellValue());

                cell = hssfRow.getCell(7);
                if (cell == null) {
                    continue;
                }
                attenceDetail.setPayCompany(cell.getStringCellValue());

              //-------------------------------
                cell = hssfRow.getCell(8);
                if (cell == null) {
                    continue;
                }
                attenceDetail.setCreator(cell.getStringCellValue());

                cell = hssfRow.getCell(9);
                if (cell == null) {
                    continue;
                }
                attenceDetail.setWorkDayNum(cell.getStringCellValue());

                cell = hssfRow.getCell(10);
                if (cell == null) {
                    continue;
                }
                attenceDetail.setExtraDayNum(cell.getStringCellValue());

                //-------------------------------
                cell = hssfRow.getCell(11);
                if (cell == null) {
                    continue;
                }
                attenceDetail.setTotalDayNum(cell.getStringCellValue());

                cell = hssfRow.getCell(12);
                if (cell == null) {
                    continue;
                }
                attenceDetail.setIsDelGather(cell.getStringCellValue());

                cell = hssfRow.getCell(13);
                if (cell == null) {
                    continue;
                }
                attenceDetail.setIsConfirmed(cell.getStringCellValue());

                cell = hssfRow.getCell(14);
                if (cell == null) {
                    continue;
                }
                attenceDetail.setCreateTime(cell.getStringCellValue());
              //-------------------------------
                cell = hssfRow.getCell(15);
                if (cell == null) {
                    continue;
                }
                attenceDetail.setEditTime(cell.getStringCellValue());
                list.add(attenceDetail);
            }
        }
        return list;
    }
}

这部份的代码由于没有采用反射实现，效率较高，但是代码冗余和灵活性不高，所以接下来将采用反射实现.。