Excel模板下载/导入导出工具类

环境 ：jdk1.8

maven ：3.8.1

引入jar ：

<!-- Excel 导入导出依赖 start -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.10-FINAL</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>3.9</version>
        </dependency>
        <!-- Excel 导入导出依赖 end -->

构建测试 Controller ：

package com...controller;

import com...service.ExcelService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;
import javax.servlet.http.HttpServletResponse;

/**
 * @author lifan
 */
@RestController
public class ExcelController {

    @Autowired
    private ExcelService excelService;

    /**
     * 模板下载
     */
    @GetMapping("/v1/dataModelDownload")
    public void insureDataModelDownload(HttpServletResponse response) throws Exception {
        excelService.dataModelDownload(response);
    }

    /**
     *批量上传
     */
    @PostMapping("/v1/addAll")
    public void dxccAddAll(@RequestParam(value = "addFile") MultipartFile addFile) {
        excelService.addAll(addFile);
    }
}

Service：

package com...service;

import com...utils.ExportExcelUtil;
import com...utils.ImportExcelUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;
import javax.servlet.http.HttpServletResponse;
import java.io.BufferedInputStream;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * @author lifan
 */
@Slf4j
@Service
public class ExcelService {

    public void dataModelDownload(HttpServletResponse response) {

        List<List<String>> list = new ArrayList<>();
        List<String> headList = new ArrayList<>();
        //标题行
        headList.add("订单类型");
        headList.add("项目名称");
        headList.add("项目代码");
        headList.add("档次名称");
        headList.add("档次代码");
        headList.add("缴费金额");
        headList.add("有效期起");
        headList.add("有效期止");
        String fileName = "XX档次导入表（模板）";
        list.add(headList);
        //示例数据：
        List<String> cList = new ArrayList<>();
        cList.add("示例：XX-000001");
        cList.add("示例：XX-000002");
        cList.add("示例：XX-000003");
        cList.add("示例：XX-000004");
        cList.add("示例：XX-000005");
        cList.add("示例：XX-200");
        cList.add("示例：XX-202101");
        cList.add("示例：XX-202112");
        list.add(cList);
        try {
            ExportExcelUtil.exportExcelModel(response, fileName, list);
        } catch (Exception e) {
            log.error("download error={},fileName={}", e, fileName);
        }
    }

    public void addAll(MultipartFile addFile) {

        String filename = addFile.getOriginalFilename();
        System.out.println(filename);

//        BufferedInputStream inputStream = (BufferedInputStream) addFile.getInputStream();
        InputStream inputStream = null;
        try {
            inputStream = addFile.getInputStream();
            Map<String, String> map = new HashMap<>();
            //字段转换
            map.put("订单类型", "ddlx");
            map.put("项目名称", "xmmc");
            map.put("项目代码", "xmdm");
            map.put("档次名称", "dcmc");
            map.put("档次代码", "dcdm");
            map.put("缴费金额", "jfje");
            map.put("有效期起", "yxqq");
            map.put("有效期止", "yxqz");
            List<Map<String, Object>> mapList = ImportExcelUtil.parseExcel(inputStream, filename, map);
            for (Map<String, Object> m : mapList) {
                //时间格式需要整理一下
                m.put("yxqq",m.get("yxqq").toString().replace(".00", ""));
                m.put("yxqz",m.get("yxqz").toString().replace(".00", ""));
                System.out.println(m);
                //输出 具体数据，去做下面的处理
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}

导出辅助类 ：

package com...utils;

import lombok.extern.slf4j.Slf4j;
import org.apache.poi.hssf.usermodel.*;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.List;

/**
 * @author lifan
 * excel 导出-辅助类
 */
@Slf4j
public class ExportExcelUtil {

    @SuppressWarnings("deprecation")
    public static byte[] exportExcelModel(HttpServletResponse response, String fileNameSheet, List<List<String>> dataList) throws Exception {
        // 生成Excel文件
        HSSFWorkbook hssfWorkbook = new HSSFWorkbook();
        // 创建Sheet
        HSSFSheet sheet = hssfWorkbook.createSheet(fileNameSheet);
        sheet.setDefaultColumnWidth((short) 20);
        String fileName = fileNameSheet;

        HSSFRow row ;
        int dataIndex = dataList.get(0).size();
        // 记录额外创建的sheet数量
        int index = 0;
        for (int r = 0; r < dataList.size(); r++) {
            //限制Excel 6w --- Excel导出超过字段限制65535
            if ( r % 60000 == 0 && r != 0 ) {
                sheet = hssfWorkbook.createSheet();
                index++;
            }
            row = sheet.createRow(r - (index * 60000));
            for (int j = 0; j < dataIndex; j++) {
                row.createCell(j,HSSFCell.CELL_TYPE_STRING).setCellValue(dataList.get(r).get(j));
            }
        }

        if (response != null) {
            response.reset();
            ServletOutputStream outputStream = response.getOutputStream();
            try {
                fileName = new String(fileName.getBytes(), "iso-8859-1") + ".xls";
                response.setCharacterEncoding("utf-8");
                response.setContentType("application/vnd.ms-excel;charset=utf-8");
                // b.Content-Disposition 设置要被下载的文件名
                response.setHeader("Content-Disposition", "attachment;filename=" + fileName);
                hssfWorkbook.write(outputStream);
                outputStream.flush();
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                if (outputStream != null) {
                    outputStream.close();
                }
            }
        }else{
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            try {
                hssfWorkbook.write(bos);
            } finally {
                bos.close();
            }
            return bos.toByteArray();
        }
        return null;
    }

    public static void getFileByBytes(byte[] bytes, String filePath, String fileName) {
        BufferedOutputStream bos=null;
        FileOutputStream fos=null;
        File file;
        try{
            File dir=new File(filePath);
            if(!dir.exists() && !dir.isDirectory()){
                dir.mkdirs();
            }
            file=new File(filePath + fileName);
            fos=new FileOutputStream(file);
            bos=new BufferedOutputStream(fos);
            bos.write(bytes);
        }
        catch(Exception e){
            log.error("getFileByBytes 生成文件error={}",e.getMessage());
        }
        finally{
            try{
                if(bos != null){
                    bos.close();
                }
                if(fos != null){
                    fos.close();
                }
            }
            catch(Exception e){
                log.error("getFileByBytes error={}",e.getMessage());
            }
        }
    }
}

导入辅助类 ：

package com...utils;

import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
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.ss.usermodel.WorkbookFactory;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import lombok.extern.slf4j.Slf4j;

/**
 * @author lifan
 * excel 导入-辅助类
 */
@Slf4j
public class ImportExcelUtil {

    private final static String excel2003L = ".xls"; // 2003- 版本的excel
    private final static String excel2007U = ".xlsx"; // 2007+ 版本的excel

    /**
     * 将流中的Excel数据转成List<Map>
     *
     * @param in       输入流
     * @param fileName 文件名（判断Excel版本）
     * @param mapping  字段名称映射
     * @return
     * @throws Exception
     */
    public static List<Map<String, Object>> parseExcel(InputStream in, String fileName, Map<String, String> mapping) throws Exception {
        // 根据文件名来创建Excel工作薄
        // Workbook work = getWorkbook(in, fileName);
        Workbook work = WorkbookFactory.create (in);
        if (null == work) {
            throw new Exception ("创建Excel工作薄为空！");
        }
        Sheet sheet = null;
        Row row = null;
        Cell cell = null;
        // 返回数据
        List<Map<String, Object>> ls = new ArrayList<Map<String, Object>> ();

        // 遍历Excel中所有的sheet
        for (int i = 0; i < work.getNumberOfSheets (); i++) {
            sheet = work.getSheetAt (i);
            if (sheet == null)
                continue;
            // 取第一行标题
            row = sheet.getRow (0);
            String title[] = null;
            if (row != null) {
                title = new String[row.getLastCellNum ()];

                for (int y = row.getFirstCellNum (); y < row.getLastCellNum (); y++) {
                    cell = row.getCell (y);
                    title[y] = String.valueOf (getCellValue (cell));
                }

            } else
                continue;
            // 遍历当前sheet中的所有行
            for (int j = 1; j < sheet.getLastRowNum () + 1; j++) {
                row = sheet.getRow (j);
                Map<String, Object> m = new HashMap<>();
                // 遍历所有的列
                for (int y = row.getFirstCellNum (); y < row.getLastCellNum (); y++) {
                    cell = row.getCell (y);
                    String key = title[y];
                    // log.info(JSON.toJSONString(key));
                    String cellValue = "";
                    if (cell != null) {
                        cellValue = String.valueOf (getCellValue (cell));
                    }
                    m.put (mapping.get (key), cellValue);
                }
                ls.add (m);
            }

        }
        return ls;
    }

    /**
     * 描述：对表格中数值进行格式化
     *
     * @param cell
     * @return
     */
    @SuppressWarnings("deprecation")
    public static Object getCellValue(Cell cell) {
        Object value = null;
        DecimalFormat df = new DecimalFormat ("0"); // 格式化number String字符
        SimpleDateFormat sdf = new SimpleDateFormat ("yyyy/MM/dd"); // 日期格式化
        DecimalFormat df2 = new DecimalFormat ("0.00"); // 格式化数字
        DecimalFormat df4 = new DecimalFormat ("0.0000"); // 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 = df2.format (cell.getNumericCellValue ());
                } else if ("m/d/yy".equals (cell.getCellStyle ().getDataFormatString ())) {
                    value = sdf.format (cell.getDateCellValue ());
                } else if ("0.00%".equals (cell.getCellStyle ().getDataFormatString ())) {
                    value = df4.format (cell.getNumericCellValue ());
                } else if ("0%".equals (cell.getCellStyle ().getDataFormatString ())) {
                    value = df4.format (cell.getNumericCellValue ());
                } 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;
    }

    /**
     * 描述：根据文件后缀，自适应上传文件的版本
     *
     * @param inStr ,fileName
     * @return
     * @throws Exception
     */
    public static 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;
    }

}

测试结果：

        导出：

导入：

 

package com.lifan.demo.service;

import com.lifan.demo.utils.ExportExcelUtil;
import com.lifan.demo.utils.ImportExcelUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;
import javax.servlet.http.HttpServletResponse;
import java.io.BufferedInputStream;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * @author lifan
 */
@Slf4j
@Service
public class ExcelService {

    public void dataModelDownload(HttpServletResponse response) {

        List<List<String>> list = new ArrayList<>();
List<String> headList = new ArrayList<>();
//标题行
headList.add("订单类型");
headList.add("项目名称");
headList.add("项目代码");
headList.add("档次名称");
headList.add("档次代码");
headList.add("缴费金额");
headList.add("有效期起");
headList.add("有效期止");
String fileName = "XX档次导入表（模板）";
list.add(headList);
//示例数据：
List<String> cList = new ArrayList<>();
cList.add("示例：XX-000001");
cList.add("示例：XX-000002");
cList.add("示例：XX-000003");
cList.add("示例：XX-000004");
cList.add("示例：XX-000005");
cList.add("示例：XX-200");
cList.add("示例：XX-202101");
cList.add("示例：XX-202112");
list.add(cList);
        try {
            ExportExcelUtil.exportExcelModel(response, fileName, list);
} catch (Exception e) {
            log.error("download error={},fileName={}", e, fileName);
}
    }

    public void addAll(MultipartFile addFile) {

        String filename = addFile.getOriginalFilename();
System.out.println(filename);

//        BufferedInputStream inputStream = (BufferedInputStream) addFile.getInputStream();
InputStream inputStream = null;
        try {
            inputStream = addFile.getInputStream();
Map<String, String> map = new HashMap<>();
//字段转换
map.put("订单类型", "ddlx");
map.put("项目名称", "xmmc");
map.put("项目代码", "xmdm");
map.put("档次名称", "dcmc");
map.put("档次代码", "dcdm");
map.put("缴费金额", "jfje");
map.put("有效期起", "yxqq");
map.put("有效期止", "yxqz");
List<Map<String, Object>> mapList = ImportExcelUtil.parseExcel(inputStream, filename, map);
            for (Map<String, Object> m : mapList) {
                //时间格式需要整理一下
m.put("yxqq",m.get("yxqq").toString().replace(".00", ""));
m.put("yxqz",m.get("yxqz").toString().replace(".00", ""));
System.out.println(m);
//输出 具体数据，去做下面的处理
}
        } catch (Exception e) {
            e.printStackTrace();
}

    }
}
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原文地址：https://www.cnblogs.com/lifan12589/p/15337828.html