POI导入导出工具类

导入POI依赖

		<dependency>
            <groupId>org.apache.poigroupId>
            <artifactId>poiartifactId>
            <version>3.17version>
        dependency>
        <dependency>
            <groupId>org.apache.poigroupId>
            <artifactId>poi-ooxmlartifactId>
            <version>3.17version>
        dependency>
        <dependency>
            <groupId>org.apache.poigroupId>
            <artifactId>poi-ooxml-schemasartifactId>
            <version>3.17version>
        dependency>

Excel导入工具类

import org.apache.commons.lang.time.DateUtils;
import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.ss.usermodel.*;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.text.SimpleDateFormat;
import java.util.*;



public class ExcelReadUtil<T> {

    /**
     * 这是一个通用的方法,利用了JAVA的反射机制,可以将放置在JAVA集合中并且符号一定条件的数据以EXCEL 的形式输出
     *
     * title         表格标题名
     * headersName  表格属性列名数组
     * headersId    表格属性列名对应的字段---你需要导出的字段名(为了更灵活控制你想要导出的字段)
     *  dtoList     需要显示的数据集合,集合中一定要放置符合javabean风格的类的对象
     *  out         与输出设备关联的流对象,可以将EXCEL文档导出到本地文件或者网络中
     */
    public   byte[] exportExcel(String title, List<String> headersName,List<String> headersId,
                                List<T> dtoList) {
        /*(一)表头--标题栏*/
        Map<Integer, String> headersNameMap = new HashMap<>();
        int key=0;
        for (int i = 0; i < headersName.size(); i++) {
            if (!headersName.get(i).equals(null)) {
                headersNameMap.put(key, headersName.get(i));
                key++;
            }
        }
        /*(二)字段*/
        Map<Integer, String> titleFieldMap = new HashMap<>();
        int value = 0;
        for (int i = 0; i < headersId.size(); i++) {
            if (!headersId.get(i).equals(null)) {
                titleFieldMap.put(value, headersId.get(i));
                value++;
            }
        }
        /* (三)声明一个工作薄:包括构建工作簿、表格、样式*/
        HSSFWorkbook wb = new HSSFWorkbook();
        HSSFSheet sheet = wb.createSheet(title);
        sheet.setDefaultColumnWidth((short)15);
        // 生成一个样式
        HSSFCellStyle style = wb.createCellStyle();
        HSSFRow row = sheet.createRow(0);
        // style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        HSSFCell cell;
        Collection c = headersNameMap.values();//拿到表格所有标题的value的集合
        Iterator<String> it = c.iterator();//表格标题的迭代器
        /*(四)导出数据:包括导出标题栏以及内容栏*/
        //根据选择的字段生成表头
        short size = 0;
        while (it.hasNext()) {
            cell = row.createCell(size);
            cell.setCellValue(it.next().toString());
            cell.setCellStyle(style);
            size++;
        }
        //表格标题一行的字段的集合
        Collection zdC = titleFieldMap.values();
        Iterator<T> labIt = dtoList.iterator();//总记录的迭代器
        int zdRow =0;//列序号
        while (labIt.hasNext()) {//记录的迭代器,遍历总记录
            int zdCell = 0;
            zdRow++;
            row = sheet.createRow(zdRow);
            T l = (T) labIt.next();
            // 利用反射,根据javabean属性的先后顺序,动态调用getXxx()方法得到属性值
            Field[] fields = l.getClass().getDeclaredFields();//获得JavaBean全部属性
            for (short i = 0; i < fields.length; i++) {//遍历属性,比对
                Field field = fields[i];
                String fieldName = field.getName();//属性名
                Iterator<String> zdIt = zdC.iterator();//一条字段的集合的迭代器
                while (zdIt.hasNext()) {//遍历要导出的字段集合
                    if (zdIt.next().equals(fieldName)) {//比对JavaBean的属性名,一致就写入,不一致就丢弃
                        String getMethodName = "get"
                                + fieldName.substring(0, 1).toUpperCase()
                                + fieldName.substring(1);//拿到属性的get方法
                        Class tCls = l.getClass();//拿到JavaBean对象
                        try {
                            Method getMethod = tCls.getMethod(getMethodName,
                                    new Class[] {});//通过JavaBean对象拿到该属性的get方法,从而进行操控
                            Object val = getMethod.invoke(l, new Object[] {});//操控该对象属性的get方法,从而拿到属性值
                            String textVal = null;
                            if (val!= null) {
                                textVal = String.valueOf(val);//转化成String
                            }else{
                                textVal = null;
                            }
                            row.createCell((short) zdCell).setCellValue(textVal);//写进excel对象
                            zdCell++;
                        } catch (SecurityException e) {
                            e.printStackTrace();
                        } catch (IllegalArgumentException e) {
                            e.printStackTrace();
                        } catch (NoSuchMethodException e) {
                            e.printStackTrace();
                        } catch (IllegalAccessException e) {
                            e.printStackTrace();
                        } catch (InvocationTargetException e) {
                            e.printStackTrace();
                        }
                    }
                }
            }
        }
        return wb.getBytes();
    }
    /**
     * Excel读取 操作
     */
    public static List<List<String>> readExcel(InputStream is) throws IOException {
        Workbook wb = null;
        SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd");
        try {
            wb = WorkbookFactory.create(is);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (InvalidFormatException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        /** 得到第一个sheet */
        Sheet sheet = wb.getSheetAt(0);
        /** 得到Excel的行数 */
        int totalRows = sheet.getPhysicalNumberOfRows();

        /** 得到Excel的列数 */
        int totalCells = 0;
        if (totalRows >= 1 && sheet.getRow(0) != null) {
            totalCells = sheet.getRow(0).getPhysicalNumberOfCells();
        }

        List<List<String>> dataLst = new ArrayList<List<String>>();
        /** 循环Excel的行 */
        for (int r = 0; r < totalRows; r++) {
            Row row = sheet.getRow(r);
            if (row == null) continue;
            if (isRowEmpty(row)) continue; //过滤空行
            List<String> rowLst = new ArrayList<String>();
            /** 循环Excel的列 */
            for (int c = 0; c < totalCells; c++) {
                Cell cell = row.getCell(c);
                String cellValue = "";
                if (null != cell) {
                     /*HSSFDataFormatter hSSFDataFormatter = new HSSFDataFormatter();
                     cellValue= hSSFDataFormatter.formatCellValue(cell);*/


                    // 以下是判断数据的类型
                    CellType type = cell.getCellTypeEnum();

                    switch (type) {
                        case NUMERIC: // 数字
                            cellValue = cell.getNumericCellValue() + "";
                            //转换时间格式
                            if (r != 0 && c == 7) {
                                Date date = dateFormat(cellValue.substring(0, cellValue.length() - 2));
//                                System.out.println(date);
                                cellValue = sf.format(date);
                            }
                            //校验整数
                            if (r != 0 && c == 6) {
                                if (cellValue.contains(".")) {
                                    int i = cellValue.indexOf(".");
                                    cellValue = cellValue.substring(0, i);
                                }

                            }
                            break;
                        case STRING: // 字符串
                            cellValue = cell.getStringCellValue();
                            break;
                        case BOOLEAN: // Boolean
                            cellValue = cell.getBooleanCellValue() + "";
                            break;
                        case FORMULA: // 公式
                            try {
                                cellValue = cell.getStringCellValue();
                            } catch (IllegalStateException e) {
                                cellValue = String.valueOf(cell.getNumericCellValue());
                            }
                            break;
                       /* cellValue = cell.getCellFormula() + "";
                        break;*/
                        case BLANK: // 空值
                            cellValue = "";
                            break;
                        case _NONE: // 故障
                            cellValue = "非法字符";
                            break;
                        default:
                            cellValue = "未知类型";
                            break;
                    }
                }

                rowLst.add(cellValue);
            }
            /** 保存第r行的第c列 */
            dataLst.add(rowLst);
        }
        return dataLst;
    }


    //时间转换方法 传取出来的时间数字
    public static Date dateFormat(String conStart1) {
        Calendar calendar = new GregorianCalendar(1900, 0, -1);
        Date d = calendar.getTime();
        Date dd = DateUtils.addDays(d, Integer.valueOf(conStart1));
        return dd;
    }

    //判断是否空行
    private static boolean isRowEmpty(Row row) {
        for (int c = row.getFirstCellNum(); c < row.getLastCellNum(); c++) {
            Cell cell = row.getCell(c);
            if (cell != null && cell.getCellType() != Cell.CELL_TYPE_BLANK)
                return false;
        }
        return true;
    }

}

调用例子

 /**
     * excel数据  批量插入
     *
     * @param file
     * @param cusId
     * @return
     */
    @RequestMapping("/addBatchDevice")
    @ResponseBody
    @CrossOrigin
    public ObjectRestResponse addBatchDevice(MultipartFile file, @RequestParam String cusId) {
        ObjectRestResponse response = new ObjectRestResponse();
        int i = 0;

        try {
            //读取excel表格
            List<List<String>> lists = ExcelUtil.readExcel(file.getInputStream());
//            System.out.println(lists);
            i = mangeService.addBatchFarmDevice(lists, cusId);
            response.setData(i);
        } catch (IOException e) {
            e.printStackTrace();
        }

        return response;
    }

导出工具类(xls方式和xlsx方式)

import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFPalette;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Method;
import java.net.URLEncoder;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;






public class ExcelExport {
    private static final Logger logger = LoggerFactory.getLogger(ExcelExport.class);
    HttpServletResponse response;
    // 文件名
    private String fileName;
    //文件保存路径
    private String fileDir;
    //sheet名
    private String sheetName;
    //表头字体
    private String titleFontType = "Arial Unicode MS";
    //表头背景色
    private String titleBackColor = "C1FBEE";
    //表头字号
    private short titleFontSize = 12;
    //添加自动筛选的列 如 A:M
    private String address = "";
    //正文字体
    private String contentFontType = "Arial Unicode MS";
    //正文字号
    private short contentFontSize = 12;
    //Float类型数据小数位
    private String floatDecimal = "0.00";
    //Double类型数据小数位
    private String doubleDecimal = "0.00";
    //设置列的公式
    private String colFormula[] = null;

    DecimalFormat floatDecimalFormat = new DecimalFormat(floatDecimal);
    DecimalFormat doubleDecimalFormat = new DecimalFormat(doubleDecimal);

    private HSSFWorkbook workbook = null;

    public ExcelExport() {

    }

    public ExcelExport(String fileDir, String sheetName) {
        this.fileDir = fileDir;
        this.sheetName = sheetName;
        workbook = new HSSFWorkbook();
    }

    public ExcelExport(HttpServletResponse response, String fileName, String sheetName) {
        this.fileName = fileName;
        this.response = response;
        this.sheetName = sheetName;
        workbook = new HSSFWorkbook();
    }

    /**
     * 设置表头字体.
     *
     * @param titleFontType
     */
    public void setTitleFontType(String titleFontType) {
        this.titleFontType = titleFontType;
    }

    /**
     * 设置表头背景色.
     *
     * @param titleBackColor 十六进制
     */
    public void setTitleBackColor(String titleBackColor) {
        this.titleBackColor = titleBackColor;
    }

    /**
     * 设置表头字体大小.
     *
     * @param titleFontSize
     */
    public void setTitleFontSize(short titleFontSize) {
        this.titleFontSize = titleFontSize;
    }

    /**
     * 设置表头自动筛选栏位,如A:AC.
     *
     * @param address
     */
    public void setAddress(String address) {
        this.address = address;
    }

    /**
     * 设置正文字体.
     *
     * @param contentFontType
     */
    public void setContentFontType(String contentFontType) {
        this.contentFontType = contentFontType;
    }

    /**
     * 设置正文字号.
     *
     * @param contentFontSize
     */
    public void setContentFontSize(short contentFontSize) {
        this.contentFontSize = contentFontSize;
    }

    /**
     * 设置float类型数据小数位 默认.00
     *
     * @param doubleDecimal 如 ".00"
     */
    public void setDoubleDecimal(String doubleDecimal) {
        this.doubleDecimal = doubleDecimal;
    }

    /**
     * 设置doubel类型数据小数位 默认.00
     *
     * @param floatDecimalFormat 如 ".00
     */
    public void setFloatDecimalFormat(DecimalFormat floatDecimalFormat) {
        this.floatDecimalFormat = floatDecimalFormat;
    }

    /**
     * 设置列的公式
     *
     * @param colFormula 存储i-1列的公式 涉及到的行号使用@替换 如A@+B@
     */
    public void setColFormula(String[] colFormula) {
        this.colFormula = colFormula;
    }

    /**
     * 写excel.
     * xls方式
     *
     * @param titleColumn 对应bean的属性名
     * @param titleName   excel要导出的列名
     * @param titleSize   列宽
     * @param dataList    数据
     */
    public void writeExcel(String titleColumn[], String titleName[], int titleSize[], List<?> dataList) {
        //添加Worksheet(不添加sheet时生成的xls文件打开时会报错)
        Sheet sheet = workbook.createSheet(this.sheetName);
        //新建文件
        OutputStream out = null;
        try {
            if (fileDir != null) {
                //有文件路径
                out = new FileOutputStream(fileDir);
            } else {
                //否则,直接写到输出流中
                out = response.getOutputStream();
                fileName = fileName + ".xls";
                response.setContentType("application/msexcel;charset=UTF-8");
                response.setHeader("Content-Disposition", "attachment; filename="
                        + URLEncoder.encode(fileName, "UTF-8"));
            }

            //写入excel的表头
            Row titleNameRow = workbook.getSheet(sheetName).createRow(0);
            //设置样式
            CellStyle titleStyle = workbook.createCellStyle();
            titleStyle = (HSSFCellStyle) setFontAndBorder(titleStyle, titleFontType, (short) titleFontSize);
            titleStyle = (HSSFCellStyle) setColor(titleStyle, titleBackColor, (short) 10);

            for (int i = 0; i < titleName.length; i++) {
                sheet.setColumnWidth(i, titleSize[i] * 256);    //设置宽度
                Cell cell = titleNameRow.createCell(i);
                cell.setCellStyle(titleStyle);
                cell.setCellValue(titleName[i].toString());
            }

            //为表头添加自动筛选
            if (!"".equals(address)) {
                CellRangeAddress c = (CellRangeAddress) CellRangeAddress.valueOf(address);
                sheet.setAutoFilter(c);
            }

            //通过反射获取数据并写入到excel中
            if (dataList != null && dataList.size() > 0) {
                //设置样式
                HSSFCellStyle dataStyle = workbook.createCellStyle();
                titleStyle = (HSSFCellStyle) setFontAndBorder(titleStyle, contentFontType, (short) contentFontSize);

                if (titleColumn.length > 0) {
                    for (int rowIndex = 1; rowIndex <= dataList.size(); rowIndex++) {
                        Object obj = dataList.get(rowIndex - 1);     //获得该对象
                        Class clsss = obj.getClass();     //获得该对对象的class实例
                        Row dataRow = workbook.getSheet(sheetName).createRow(rowIndex);
                        for (int columnIndex = 0; columnIndex < titleColumn.length; columnIndex++) {
                            String title = titleColumn[columnIndex].toString().trim();
                            if (!"".equals(title)) {  //字段不为空
                                //使首字母大写
                                String UTitle = Character.toUpperCase(title.charAt(0)) + title.substring(1, title.length()); // 使其首字母大写;
                                String methodName = "get" + UTitle;

                                // 设置要执行的方法
                                Method method = clsss.getDeclaredMethod(methodName);

                                //获取返回类型
                                String returnType = method.getReturnType().getName();
                                Object object = method.invoke(obj);
                                String data = method.invoke(obj) == null ? "" : object.toString();
                                Cell cell = dataRow.createCell(columnIndex);
                                if (data != null && !"".equals(data)) {
                                    if ("int".equals(returnType)) {
                                        cell.setCellValue(Integer.parseInt(data));
                                    } else if ("long".equals(returnType)) {
                                        cell.setCellValue(Long.parseLong(data));
                                    } else if ("float".equals(returnType)) {
                                        cell.setCellValue(floatDecimalFormat.format(Float.parseFloat(data)));
                                    } else if ("double".equals(returnType)) {
                                        cell.setCellValue(doubleDecimalFormat.format(Double.parseDouble(data)));
                                    } else if (Date.class.getName().equals(returnType)) {
                                        cell.setCellValue(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(object));
                                    } else {
                                        cell.setCellValue(data);
                                    }
                                }
                            } else {   //字段为空 检查该列是否是公式
                                if (colFormula != null) {
                                    String sixBuf = colFormula[columnIndex].replace("@", (rowIndex + 1) + "");
                                    Cell cell = dataRow.createCell(columnIndex);
                                    cell.setCellFormula(sixBuf);
                                }
                            }
                        }
                    }
                }
            }
            workbook.write(out);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (out != null) {
                try {
                    out.close();
                } catch (IOException e) {
                    logger.debug("导出写Excel异常");
                }
            }
        }
    }


    /**
     * xlsx方式
     *
     * @param response
     * @param fileName
     * @param titleColumn
     * @param titleName
     * @param titleSize
     * @param dataList
     */
    public void writeBigExcel(HttpServletResponse response, String fileName, String titleColumn[],
                              String titleName[], int titleSize[], List<?> dataList) {
        try {
            SXSSFWorkbook workbook = new SXSSFWorkbook(100);
            OutputStream out = response.getOutputStream();
            String lastFileName = fileName + ".xlsx";
            response.setContentType("application/msexcel;charset=UTF-8");
            response.setHeader("Content-Disposition", "attachment; filename="
                    + URLEncoder.encode(lastFileName, "UTF-8"));
            int k = 0;
            int rowIndex;
            Sheet sheet = workbook.createSheet(fileName + (k + 1));
            //写入excel的表头
            Row titleNameRow = workbook.getSheet(fileName + (k + 1)).createRow(0);
            for (int i = 0; i < titleName.length; i++) {
                sheet.setColumnWidth(i, titleSize[i] * 256);    //设置宽度
                Cell cell = titleNameRow.createCell(i);
                cell.setCellValue(titleName[i]);
            }
            //写入到excel中
            if (dataList != null && dataList.size() > 0) {
                if (titleColumn.length > 0) {
                    for (int index = 0; index < dataList.size(); index++) {
                        //每个sheet3W条数据
                        if (index != 0 && (index) % 30000 == 0) {
                            k = k + 1;
                            sheet = workbook.createSheet(fileName + (k + 1));
                            //写入excel的表头
                            titleNameRow = workbook.getSheet(fileName + (k + 1)).createRow(0);
                            for (int i = 0; i < titleName.length; i++) {
                                sheet.setColumnWidth(i, titleSize[i] * 256);    //设置宽度
                                Cell cell = titleNameRow.createCell(i);
                                cell.setCellValue(titleName[i]);
                            }
                        }
                        if (index < 30000) {
                            rowIndex = index + 1;
                        } else {
                            rowIndex = index - 30000 * ((index) / 30000) + 1;
                        }
                        Object obj = dataList.get(index);
                        Class clazz = obj.getClass();
                        Row dataRow = workbook.getSheet(fileName + (k + 1)).createRow(rowIndex);
                        for (int columnIndex = 0; columnIndex < titleColumn.length; columnIndex++) {
                            String title = titleColumn[columnIndex].trim();
                            if (!"".equals(title)) {
                                // 获取返回类型
                                String UTitle = Character.toUpperCase(title.charAt(0)) + title.substring(1, title.length()); // 使其首字母大写;
                                String methodName = "get" + UTitle;
                                Method method = clazz.getDeclaredMethod(methodName);
                                String returnType = method.getReturnType().getName();
                                Object object = method.invoke(obj);
                                String data = method.invoke(obj) == null ? "" : object.toString();
                                Cell cell = dataRow.createCell(columnIndex);
                                if (data != null && !"".equals(data)) {
                                    if ("int".equals(returnType)) {
                                        cell.setCellValue(Integer.parseInt(data));
                                    } else if ("long".equals(returnType)) {
                                        cell.setCellValue(Long.parseLong(data));
                                    } else if ("float".equals(returnType)) {
                                        cell.setCellValue(new DecimalFormat("0.00").format(Float.parseFloat(data)));
                                    } else if ("double".equals(returnType)) {
                                        cell.setCellValue(new DecimalFormat("0.00").format(Double.parseDouble(data)));
                                    } else if (Date.class.getName().equals(returnType)) {
                                        cell.setCellValue(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(object));
                                    } else {
                                        cell.setCellValue(data);
                                    }
                                } else {   //字段为空 检查该列是否是公式
                                    if (colFormula != null) {
                                        String sixBuf = colFormula[columnIndex].replace("@", (rowIndex + 1) + "");
                                        cell = dataRow.createCell(columnIndex);
                                        cell.setCellFormula(sixBuf);
                                    }
                                }
                            }
                        }
                    }
                }
            }
            workbook.write(out);
            out.flush();
            out.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 将16进制的颜色代码写入样式中来设置颜色
     *
     * @param style 保证style统一
     * @param color 颜色:66FFDD
     * @param index 索引 8-64 使用时不可重复
     * @return
     */
    public CellStyle setColor(CellStyle style, String color, short index) {
        if ("".equals(color)) {
            //转为RGB码
            int r = Integer.parseInt((color.substring(0, 2)), 16);   //转为16进制
            int g = Integer.parseInt((color.substring(2, 4)), 16);
            int b = Integer.parseInt((color.substring(4, 6)), 16);
            //自定义cell颜色
            HSSFPalette palette = workbook.getCustomPalette();
            palette.setColorAtIndex((short) index, (byte) r, (byte) g, (byte) b);

            style.setFillPattern(FillPatternType.SOLID_FOREGROUND);
            style.setFillForegroundColor(index);
        }
        return style;
    }

    /**
     * 设置字体并加外边框
     *
     * @param style 样式
     * @param style 字体名
     * @param style 大小
     * @return
     */
    public CellStyle setFontAndBorder(CellStyle style, String fontName, short size) {
        HSSFFont font = workbook.createFont();
        font.setFontHeightInPoints(size);
        font.setFontName(fontName);
        font.setBold(true);//是否加粗
        style.setFont(font);
        style.setBorderBottom(BorderStyle.THIN); //下边框
        style.setBorderLeft(BorderStyle.THIN);//左边框
        style.setBorderTop(BorderStyle.THIN);//上边框
        style.setBorderRight(BorderStyle.THIN);//右边框
        style.setFillForegroundColor(HSSFColor.RED.index);// 设置背景色
        return style;
    }



}

调用例子

导出xls

/**
     * 导出Excel所有
     *
     * @param response
     */
    @Override
    public void exportExcel(HttpServletResponse response, Long companyId) {
        List<EpcSystemDictionary> epcSystemDictionaryList = epcSystemDictionaryMapper.getAll(companyId);
        ExcelExport excelExport = new ExcelExport(response, "数据字典总数据", "sheet1");
        excelExport.writeExcel(new String[]{"code", "name", "enName", "level", "sort"}
                , new String[]{"编号", "名称", "英文名称", "层级", "排序"}
                , new int[]{30, 30, 30, 30, 30}, epcSystemDictionaryList);
    }

导出xlsx

/**
     * excel数据  牧场数据导出
     *
     * @param cusId
     * @return
     */
    @GetMapping("/export")
    @ResponseBody
    @CrossOrigin
    public void export(@RequestParam String cusId, HttpServletResponse response) {
        if (cusId == null || cusId.isEmpty()) {
            throw new BusinessException("cusId不能为空");
        }
        List<FarmDevice> list = mangeMapper.findFarmDeviceByCusId(cusId);
        if (list.size() > 0) {
            ExcelExport excelExport = new ExcelExport();
            String title = "牧场数据导出Excel";
            String[] titleColumn = {"farmName", "farmContactName"}; //该牧场名称对应的属性farmName
            String[] titleName = {"牧场名称", "牧场主"}; //表头,列名
            int[] titleSize = {20, 20};
            excelExport.writeBigExcel(response, title, titleColumn, titleName, titleSize, list);
        } else {
            log.info("该客户下没有牧场!");
        }

    }

相关链接:
https://www.jianshu.com/p/9fd84f1ce725
https://blog.csdn.net/kxj19980524/article/details/93121012

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