SpringBoot导出excel表格

第一步 导入依赖

        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.8</version>
        </dependency>

第二步 编写导出excel表格的工具类

package com.xjpower.web.core.export;

import org.apache.commons.lang3.StringUtils;
import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.CreationHelper;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.util.DateFormatConverter;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.lang.reflect.Field;
import java.net.URLEncoder;
import java.util.*;

import com.xjpower.web.core.export.ExcelExtGrid.GridColumn;
import org.springframework.util.ReflectionUtils;
import org.springframework.web.servlet.view.document.AbstractExcelView;

/**
 * Excel 导出的View
 */
@SuppressWarnings("unchecked")
public class ExcelExportView extends AbstractExcelView {

    /**
     * 一个像素转换为多少宽度
     */
    static final float PIX_TO_WIDTH = 100 * 50 / 132;

    static final String DATE_COLUMN_XTYPE = "datecolumn";
    static final String LINK_COLUMN_XTYPE = "linkcolumn";
    static final String NUMBER_COLUMN_XTYPE = "numbercolumn ";
    static final String BOOLEAN_COLUMN_XTYPE = "booleancolumn";
    static final String COLUMN_XTYPE = "gridcolumn";

    /**
     * 返回默认文件名
     *
     * @return
     */
    static final String getDefaultExportFileName() {
        return "export.xls";
    }

    /**
     * 构造函数需要的配置
     */
    ExcelExtGrid grid = null;

    /**
     * 填充数据所需要列表数据
     */
    List data = null;

    /**
     * 通过ExtjsGrid的Column配置导出
     *
     * @param grid grid配置（列）
     * @param data 查询数据
     */
    public ExcelExportView(ExcelExtGrid grid, List data) {
        this.grid = grid;
        this.data = data;
    }

    protected void buildExcelDocument(Map model, HSSFWorkbook workbook, HttpServletRequest req, HttpServletResponse resp) throws Exception {
        this.generateExcel(workbook, grid, data);
        String fileName = StringUtils.isNotEmpty(grid.fileName) ? grid.fileName : getDefaultExportFileName();
        fileName = fileName.endsWith(".xls") ? fileName : fileName + ".xls";
        String filename = encodeFilename(fileName, req);//处理中文文件名
        resp.setContentType("application/vnd.ms-excel");
        resp.setHeader("Content-disposition", "attachment;filename=" + filename);

        OutputStream ouputStream = resp.getOutputStream();
        workbook.write(ouputStream);
        ouputStream.flush();
        ouputStream.close();
    }

    /**
     * 设置下载文件中文件的名称
     *
     * @param filename
     * @param request
     * @return
     */
    public static String encodeFilename(String filename, HttpServletRequest request) {
        /**
         * 获取客户端浏览器和操作系统信息
         * 在IE浏览器中得到的是：User-Agent=Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon; Alexa Toolbar)
         * 在Firefox中得到的是：User-Agent=Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.7.10) Gecko/20050717 Firefox/1.0.6
         */
        try {
            return URLEncoder.encode(filename, "UTF-8");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return filename;
    }

    /**
     * grid的xtype对应到单元格赋值
     */
    Map<String, String> gridColumnXtypeFormat = null;

    public Map<String, String> getGridColumnXtypeFormat() {
        if (gridColumnXtypeFormat == null)
            gridColumnXtypeFormat = new HashMap<String, String>();
        String dateFormat = DateFormatConverter.convert(Locale.SIMPLIFIED_CHINESE, "yyyy-MM-dd HH:mm:ss");
        gridColumnXtypeFormat.put(DATE_COLUMN_XTYPE, dateFormat);// "yyyy-MM-dd
        // HH:mm:ss");
        return gridColumnXtypeFormat;
    }

    private int toColumnWidth(int pixWidth) {
        Float colWdt = pixWidth * PIX_TO_WIDTH;
        return colWdt.intValue();
    }

    /**
     * /**
     * 通过参数和数据生成Excel文件
     *
     * @param workbook 电子表格
     * @param grid     ExtjsGrid导出列配置
     * @param data     查询数据
     * @return
     * @throws Exception
     */
    @SuppressWarnings("unchecked")
    protected HSSFWorkbook generateExcel(HSSFWorkbook workbook, ExcelExtGrid grid, List data) throws Exception {
        workbook = workbook == null ? new HSSFWorkbook() : workbook;

        HSSFSheet sheet = workbook.createSheet();// 创建一个Excel的Sheet
        sheet.createFreezePane(1, 1);// 冻结header

        // 列头的样式
        HSSFCellStyle columnHeadStyle = getColumnHeaderStyle(workbook);

        try {
            // 创建第一行
            HSSFRow row0 = sheet.createRow(0);
            // 设置行高
            row0.setHeight((short) 500); // 50pix高度

            // 初始化列头和数据列单元格样式
            Map<String, HSSFCellStyle> columnStyleMap = new HashMap<String, HSSFCellStyle>();

            for (int i = 0; i < grid.columns.size(); i++) {
                GridColumn col = grid.columns.get(i);
                if (col.width != null) {
                    sheet.setColumnWidth(i, toColumnWidth(col.width));// 70pix宽度
                } else
                    sheet.setColumnWidth(i, toColumnWidth(100));

                HSSFCell cell = row0.createCell(i);
                cell.setCellStyle(columnHeadStyle);
                cell.setCellValue(new HSSFRichTextString(col.header));

                columnStyleMap.put(col.dataIndex, getDataCellStyle(workbook, col.xtype));
            }

            // 填充数据内容
            for (int i = 0; i < data.size(); i++) {
                Object robj = data.get(i);
                HSSFRow row = sheet.createRow(i + 1);// 除去头部
                HSSFCell cell = null;
                // 当行赋值
                for (int c = 0; c < grid.columns.size(); c++) {
                    GridColumn col = grid.columns.get(c);
                    cell = row.createCell(c);

                    setDataCellValue(robj, cell, col, workbook);

                    cell.setCellStyle(columnStyleMap.get(col.dataIndex));
                }
            }

            return workbook;

        } catch (Exception e) {
            throw new Exception("导出Excel文件[" + grid.fileName + "]出错", e);
        }
    }

    /**
     * 设置列值 （日期类型赋值date，默认类型String
     *
     * @param rdata 汗数据
     * @param cell  单元格
     * @param col   列
     */
    private void setDataCellValue(Object rdata, HSSFCell cell, GridColumn col, HSSFWorkbook workbook) {
        Object o = null;

        if (rdata instanceof Map) {
            o = ((Map) rdata).get(col.dataIndex);
        } else {
            o = getFieldValue(rdata, col.dataIndex);
        }

        if (o == null)
            return;

        if (DATE_COLUMN_XTYPE.equals(col.xtype)) {
            if (o instanceof Date) {
                cell.setCellValue((Date) o);
            }
        } else {
            cell.setCellValue(o.toString());
        }
    }

    /**
     * @param src
     * @param valuePath
     * @return
     */
    public static Object getFieldValue(Object src, String valuePath) {
        String[] valuePaths = valuePath.split("\\.");
        Object o = src;
        for (String field : valuePaths) {
            Field f = ReflectionUtils.findField(src.getClass(), field);
            ReflectionUtils.makeAccessible(f);

            o = ReflectionUtils.getField(f, o);
        }
        return o;
    }

    /**
     * 获取每个数据内容单元格的样式
     *
     * @param workbook
     * @param gridColumnXtype 默认配置格式化
     * @return
     */
    private HSSFCellStyle getDataCellStyle(HSSFWorkbook workbook, String gridColumnXtype) {
        HSSFFont font = workbook.createFont();
        CreationHelper createHelper = workbook.getCreationHelper();

        font.setFontName("宋体");
        font.setFontHeightInPoints((short) 10);
        // 普通单元格样式
        HSSFCellStyle style = workbook.createCellStyle();
        style.setFont(font);
        style.setAlignment(CellStyle.ALIGN_LEFT);// 左右居中
        style.setVerticalAlignment(CellStyle.VERTICAL_TOP);// 上下居中
        style.setWrapText(true);
        style.setLeftBorderColor(HSSFColor.BLACK.index);
        style.setBorderLeft((short) 1);
        style.setRightBorderColor(HSSFColor.BLACK.index);
        style.setBorderRight((short) 1);
        style.setBorderBottom(CellStyle.BORDER_THIN); // 设置单元格的边框为粗体
        style.setBottomBorderColor(HSSFColor.BLACK.index); // 设置单元格的边框颜色．
        style.setFillForegroundColor(HSSFColor.WHITE.index);// 设置单元格的背景颜色．

        String format = getGridColumnXtypeFormat().get(gridColumnXtype);
        if (StringUtils.isNotEmpty(format)) {// "m/d/yy h:mm"
            style.setDataFormat(createHelper.createDataFormat().getFormat(format));
        }

        return style;
    }

    /**
     * 生成列头样式
     *
     * @param workbook
     * @return
     */
    private HSSFCellStyle getColumnHeaderStyle(HSSFWorkbook workbook) {
        HSSFFont columnHeadFont = workbook.createFont();
        columnHeadFont.setFontName("宋体");
        columnHeadFont.setFontHeightInPoints((short) 10);
        columnHeadFont.setBoldweight(Font.BOLDWEIGHT_BOLD);

        HSSFCellStyle columnHeadStyle = workbook.createCellStyle();
        columnHeadStyle.setFont(columnHeadFont);
        columnHeadStyle.setAlignment(CellStyle.ALIGN_CENTER);// 左右居中
        columnHeadStyle.setVerticalAlignment(CellStyle.VERTICAL_CENTER);// 上下居中
        columnHeadStyle.setLocked(true);
        columnHeadStyle.setWrapText(true);
        columnHeadStyle.setLeftBorderColor(HSSFColor.BLACK.index);// 左边框的颜色
        columnHeadStyle.setBorderLeft((short) 1);// 边框的大小
        columnHeadStyle.setRightBorderColor(HSSFColor.BLACK.index);// 右边框的颜色
        columnHeadStyle.setBorderRight((short) 1);// 边框的大小
        columnHeadStyle.setBorderBottom(CellStyle.BORDER_THIN); // 设置单元格的边框为粗体
        columnHeadStyle.setBottomBorderColor(HSSFColor.BLACK.index); // 设置单元格的边框颜色
        columnHeadStyle.setFillForegroundColor(HSSFColor.WHITE.index); // 设置单元格的背景颜色（单元格的样式会覆盖列或行的样式）
        return columnHeadStyle;
    }
}

第三步 编写映射到excel表格的样式类

package com.xjpower.web.core.export;

import java.util.ArrayList;
import java.util.List;


/**
 * 映射到ExtjsGrid的 Excel导出格式
 */
public class ExcelExtGrid {

    public String fileId;

    public String fileName;

    /**
     * 增加 Grid column
     *
     * @param header
     * @param width
     * @param dataIndex
     */
    public void addGridColumn(String header, Integer width, String dataIndex, String xtype) {
        GridColumn col = new GridColumn();
        col.header = header;
        col.width = width;
        col.dataIndex = dataIndex;
        col.xtype = xtype;
        this.columns.add(col);
    }

    /**
     * 表列布局
     */
    public List<GridColumn> columns = new ArrayList<GridColumn>();

    /**
     * extjs grid的属性映射
     */
    public static class GridColumn {
        /**
         * 列头
         */
        public String header;

        /**
         * 列宽度
         */
        public Integer width;

        /**
         * 访问值
         */
        public String dataIndex;

        /**
         * 数据类型
         */
        public String xtype;
    }
}

第四步 编写Controller

 /*导出表格*/
    @RequestMapping("outInRecord/exportList")
    @ResponseBody
    public ModelAndView exportList(String name) {
        ExcelExportView excelExportView = null;
        try {
           /* JSONObject jsonObject = JSONObject.parseObject(qp);
            ExportDto exportDto = jsonObject.getObject("q", ExportDto.class);*/
            int start = 0;
            int limit = 2000;//最大导出总数
            ExcelExtGrid grid = new ExcelExtGrid();
            grid.fileName = "员工责任表";
            grid.addGridColumn("编号", 80, "ID", "gridcolumn");
            grid.addGridColumn("名字", 80, "name", "gridcolumn");
            grid.addGridColumn("责任", 80, "bility", "gridcolumn");
            /*从数据库查出来相对应的数据*/
            PageInfo<People> outInRecordDetailPageInfo = peopleService.SelectAll(name,start, limit);

            excelExportView = new ExcelExportView(grid, outInRecordDetailPageInfo.getList());
        } catch (Exception e) {
            logger.error("OutInRecordController.exportList异常：", e); //不用写也行
        }
        return new ModelAndView(excelExportView);
    }

第五步 js调用后端得到数据

$("#exportList").on('click', function (event) {
       // FormUtils.create("people/outInRecord/exportList");
        alert("ss");
        window.location.href="outInRecord/exportList";
        event.stopPropagation();
    });