将页面数据导出到excel

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1、通用的导出函数 参考：https://blog.csdn.net/qq_32403351/article/details/76102423

  需要的jar包：

• servlet-api.jar
• poi-3.9.jar

import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.util.CellRangeAddress;
import javax.servlet.http.HttpServletResponse;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;

/**
 * 导出Excel公共方法
 *
 * @author zhanghb
 * @version 1.0
 */
public class CommonExcel {

    //显示的导出表的标题
    private String title;
    //导出表的列名
    private String[] rowName;
    //导出的文件名
    private String fileName;

    private List<Object[]> dataList = new ArrayList<Object[]>();

    private HttpServletResponse response;

    //构造方法，传入要导出的数据
    public CommonExcel(String title, String[] rowName, List<Object[]> dataList, HttpServletResponse response, String fileName) {
        this.dataList = dataList;
        this.rowName = rowName;
        this.title = title;
        this.response = response;
        this.fileName = fileName;
    }

    /*
     * 导出数据
     */
    public void downloadExcel() throws Exception {
        try {
            HSSFWorkbook workbook = new HSSFWorkbook();                     // 创建工作簿对象
            HSSFSheet sheet = workbook.createSheet(title);                  // 创建工作表

            // 产生表格标题行
            HSSFRow rowm = sheet.createRow(0);
            HSSFCell cellTiltle = rowm.createCell(0);

            //sheet样式定义【getColumnTopStyle()/getStyle()均为自定义方法 - 在下面  - 可扩展】
            HSSFCellStyle columnTopStyle = this.getColumnTopStyle(workbook);//获取列头样式对象
            HSSFCellStyle style = this.getStyle(workbook);                  //单元格样式对象

            sheet.addMergedRegion(new CellRangeAddress(0, 1, 0, (rowName.length - 1)));
            cellTiltle.setCellStyle(columnTopStyle);
            cellTiltle.setCellValue(title);

            // 定义所需列数
            int columnNum = rowName.length;
            HSSFRow rowRowName = sheet.createRow(2);                // 在索引2的位置创建行(最顶端的行开始的第二行)

            // 将列头设置到sheet的单元格中
            for (int n = 0; n < columnNum; n++) {
                HSSFCell cellRowName = rowRowName.createCell(n);               //创建列头对应个数的单元格
                cellRowName.setCellType(HSSFCell.CELL_TYPE_STRING);             //设置列头单元格的数据类型
                HSSFRichTextString text = new HSSFRichTextString(rowName[n]);
                cellRowName.setCellValue(text);                                 //设置列头单元格的值
                cellRowName.setCellStyle(columnTopStyle);                       //设置列头单元格样式
            }

            //将查询出的数据设置到sheet对应的单元格中
            for (int i = 0; i < dataList.size(); i++) {

                Object[] obj = dataList.get(i);//遍历每个对象
                HSSFRow row = sheet.createRow(i + 3);//创建所需的行数

                for (int j = 0; j < obj.length; j++) {
                    HSSFCell cell = null;   //设置单元格的数据类型
                    if (j == 0) {
                        cell = row.createCell(j, HSSFCell.CELL_TYPE_NUMERIC);
                        cell.setCellValue(i + 1);
                    } else {
                        cell = row.createCell(j, HSSFCell.CELL_TYPE_STRING);
                        if (!"".equals(obj[j]) && obj[j] != null) {
                            cell.setCellValue(obj[j].toString());                       //设置单元格的值
                        }
                    }
                    cell.setCellStyle(style);                                   //设置单元格样式
                }
            }
            //让列宽随着导出的列长自动适应
            for (int colNum = 0; colNum < columnNum; colNum++) {
                int columnWidth = sheet.getColumnWidth(colNum) / 256;
                for (int rowNum = 0; rowNum < sheet.getLastRowNum(); rowNum++) {
                    HSSFRow currentRow;
                    //当前行未被使用过
                    if (sheet.getRow(rowNum) == null) {
                        currentRow = sheet.createRow(rowNum);
                    } else {
                        currentRow = sheet.getRow(rowNum);
                    }
                    if (currentRow.getCell(colNum) != null) {
                        HSSFCell currentCell = currentRow.getCell(colNum);
                        if (currentCell.getCellType() == HSSFCell.CELL_TYPE_STRING) {
                            int length = currentCell.getStringCellValue().getBytes().length;
                            if (columnWidth < length) {
                                columnWidth = length;
                            }
                        }
                    }
                }
                if (colNum == 0) {
                    sheet.setColumnWidth(colNum, (columnWidth - 2) * 256);
                } else {
                    sheet.setColumnWidth(colNum, (columnWidth + 4) * 256);
                }
            }

            if (workbook != null) {
                try {
                    if (response != null) {
                        response.setContentType("application/vnd.ms-excel;charset=utf-8");
                        response.setHeader("Content-Disposition", "attachment;filename=\""+new String(fileName.getBytes("gb2312"),"ISO8859-1"));
                        OutputStream out = response.getOutputStream();
                        workbook.write(out);
                        out.close();
                    } else {
                        FileOutputStream outputStream = new FileOutputStream("D:/"+fileName);
                        workbook.write(outputStream);
                        outputStream.close();
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /*
     * 列头单元格样式
     */
    public HSSFCellStyle getColumnTopStyle(HSSFWorkbook workbook) {

        // 设置字体
        HSSFFont font = workbook.createFont();
        //设置字体大小
        font.setFontHeightInPoints((short) 12);
        //字体加粗
        font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
        //设置字体名字
        font.setFontName("微软雅黑");
        //设置样式;
        HSSFCellStyle style = workbook.createCellStyle();
        //设置底边框;
        style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
        //设置底边框颜色;
        style.setBottomBorderColor(HSSFColor.BLACK.index);
        //设置左边框;
        style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
        //设置左边框颜色;
        style.setLeftBorderColor(HSSFColor.BLACK.index);
        //设置右边框;
        style.setBorderRight(HSSFCellStyle.BORDER_THIN);
        //设置右边框颜色;
        style.setRightBorderColor(HSSFColor.BLACK.index);
        //设置顶边框;
        style.setBorderTop(HSSFCellStyle.BORDER_THIN);
        //设置顶边框颜色;
        style.setTopBorderColor(HSSFColor.BLACK.index);
        //在样式用应用设置的字体;
        style.setFont(font);
        //设置自动换行;
        style.setWrapText(false);
        //设置水平对齐的样式为居中对齐;
        style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        //设置垂直对齐的样式为居中对齐;
        style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);

        return style;

    }

    /*
     * 列数据信息单元格样式
     */
    public HSSFCellStyle getStyle(HSSFWorkbook workbook) {
        // 设置字体
        HSSFFont font = workbook.createFont();
        //设置字体名字
        font.setFontName("微软雅黑");
        //设置样式;
        HSSFCellStyle style = workbook.createCellStyle();
        //设置底边框;
        style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
        //设置底边框颜色;
        style.setBottomBorderColor(HSSFColor.BLACK.index);
        //设置左边框;
        style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
        //设置左边框颜色;
        style.setLeftBorderColor(HSSFColor.BLACK.index);
        //设置右边框;
        style.setBorderRight(HSSFCellStyle.BORDER_THIN);
        //设置右边框颜色;
        style.setRightBorderColor(HSSFColor.BLACK.index);
        //设置顶边框;
        style.setBorderTop(HSSFCellStyle.BORDER_THIN);
        //设置顶边框颜色;
        style.setTopBorderColor(HSSFColor.BLACK.index);
        //在样式用应用设置的字体;
        style.setFont(font);
        //设置自动换行;
        style.setWrapText(false);
        //设置水平对齐的样式为居中对齐;
        style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        //设置垂直对齐的样式为居中对齐;
        style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
        return style;
    }
}

测试方法：

public static void main(String[] args)throws Exception {
    HttpServletResponse response=null;
    String title = "xx报表";
    String[] rowsName = new String[]{"oo","xx","oo","xx","xx","oo"};
    List<Object[]>  dataList = new ArrayList<Object[]>();
    Object[] objs = null;
    for (int i = 0; i < 10; i++) {
        objs = new Object[rowsName.length];
        objs[0] = i;
        objs[1] = i;
        objs[2] = i;
        objs[3] = i;
        objs[4] = i;
        SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        String date = df.format(new Date());
        objs[5] = date;
        dataList.add(objs);
    }
    String fileName="xx报表-"+String.valueOf(System.currentTimeMillis()).substring(4,13)+".xls";
    CommonExcel ex = new CommonExcel(title, rowsName, dataList,response,fileName);
    ex.downloadExcel();
}

 结果：

由于遇到自动设置列宽时报空指针错误，数据为空时自动赋值为表头标题以及自身需求，所以进行了以下修改：主要时去掉自动设置列宽和表头标题，重新设置起始位置。

【response】为项目框架提供，所以不需要赋值。

 /*
     * 导出数据
     */
    public void downloadExcel(String title, String[] rowName, List<Object[]> dataList, String fileName) throws Exception {

        logger.info("============进入数据导出方法==============");
        try {
            HSSFWorkbook workbook = new HSSFWorkbook();                     // 创建工作簿对象
            HSSFSheet sheet = workbook.createSheet(title);                  // 创建工作表

           /* // 产生表格标题行
            HSSFRow rowm = sheet.createRow(0);
            HSSFCell cellTiltle = rowm.createCell(0);*/

            //sheet样式定义【getColumnTopStyle()/getStyle()均为自定义方法 - 在下面  - 可扩展】
            HSSFCellStyle columnTopStyle = this.getColumnTopStyle(workbook);//获取列头样式对象
            HSSFCellStyle style = this.getStyle(workbook);                  //单元格样式对象

          /*  sheet.addMergedRegion(new CellRangeAddress(0, 1, 0, (rowName.length - 1)));
            cellTiltle.setCellStyle(columnTopStyle);
            cellTiltle.setCellValue(title);*/

            // 定义所需列数
            int columnNum = rowName.length;
            HSSFRow rowRowName = sheet.createRow(0);                // 在索引0的位置创建行

            // 将列头设置到sheet的单元格中
            for (int n = 0; n < columnNum; n++) {
                HSSFCell cellRowName = rowRowName.createCell(n);               //创建列头对应个数的单元格
                cellRowName.setCellType(HSSFCell.CELL_TYPE_STRING);             //设置列头单元格的数据类型
                HSSFRichTextString text = new HSSFRichTextString(rowName[n]);
                cellRowName.setCellValue(text);                                 //设置列头单元格的值
                cellRowName.setCellStyle(columnTopStyle);                       //设置列头单元格样式
            }

            //将查询出的数据设置到sheet对应的单元格中
            for (int i = 0; i < dataList.size(); i++) {

                Object[] obj = dataList.get(i);//遍历每个对象
                HSSFRow row = sheet.createRow(i + 1);//创建所需的行数

                for (int j = 0; j < obj.length; j++) {
                    HSSFCell cell = null;   //设置单元格的数据类型
                    if (j == 0) {
                        cell = row.createCell(j, HSSFCell.CELL_TYPE_NUMERIC);
                        cell.setCellValue(i + 1);
                    } else {
                        cell = row.createCell(j, HSSFCell.CELL_TYPE_STRING);
                        if (!"".equals(obj[j]) && obj[j] != null) {
                            cell.setCellValue(obj[j].toString());                       //设置单元格的值
                        }
                    }
                    cell.setCellStyle(style);                                   //设置单元格样式
                }
            }
           /* //让列宽随着导出的列长自动适应
            for (int colNum = 0; colNum < columnNum; colNum++) {
                int columnWidth = sheet.getColumnWidth(colNum) / 256;
                for (int rowNum = 0; rowNum < sheet.getLastRowNum(); rowNum++) {
                    HSSFRow currentRow;
                    //当前行未被使用过
                    if (sheet.getRow(rowNum) == null) {
                        currentRow = sheet.createRow(rowNum);
                    } else {
                        currentRow = sheet.getRow(rowNum);
                    }
                    if (currentRow.getCell(colNum) != null) {
                        HSSFCell currentCell = currentRow.getCell(colNum);
                        if (currentCell.getCellType() == HSSFCell.CELL_TYPE_STRING) {
                            int length = currentCell.getStringCellValue().getBytes().length;
                            if (columnWidth < length) {
                                columnWidth = length;
                            }
                        }
                    }
                }
                if (colNum == 0) {
                    sheet.setColumnWidth(colNum, (columnWidth - 2) * 256);
                } else {
                    sheet.setColumnWidth(colNum, (columnWidth + 4) * 256);
                }
            }*/

            if (workbook != null) {
                try {
                    if (response != null) {
                        logger.info("=======正在导出数据========");
                       // response.reset();
                        //response.getWriter().close();
                        response.setContentType("application/vnd.ms-excel;charset=utf-8");
                        response.setHeader("Content-Disposition", "attachment;filename=\""+new String(fileName.getBytes("gb2312"),"ISO8859-1"));
                        OutputStream out = response.getOutputStream();
                        workbook.write(out);
                        out.close();
                        logger.info("=======数据导出完毕=========");
                    } else {
                        FileOutputStream outputStream = new FileOutputStream("D:/"+fileName);
                        workbook.write(outputStream);
                        outputStream.close();
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

2、调用

 public void ajaxGetPreRegisterOrderActivityList() throws Exception {
        String [] rowName = {"序号","唯一标识","用户名","登记号码"};
        title = "数据";
        fileName = "数据"+createTime+"--"+endTime+"数据"+String.valueOf(System.currentTimeMillis()).substring(4,13)+".xls";
        List<PreRegisterOrderVO> list = exportDataToExcelService.findPreRegisterOrderList(createTime,endTime);//获取该时间段的数据
        List<Object[]>  dataList = new ArrayList<Object[]>();
        Object[] objs = null;
        for (int i = 0; i < list.size(); i++) {
            objs = new Object[rowName.length];
            objs[0] = String.valueOf(i);
            objs[1] = list.get(i).getId();
            objs[2] = list.get(i).getUserName();
            objs[3] = list.get(i).getMobile();
            dataList.add(objs);
        }
        downloadExcel(title, rowName,dataList, fileName);
    }

3、前端执行【利用js执行】(后台设置createTime,endTime的Getter和Setter方法)

 window.location.href = "${baseURL}/exportDataToExcel/exportDataToExcelAction!ajaxGetPreRegisterOrderActivityList.action?createTime="+beginTime+"&endTime="+endTime;