EasyPoi

EasyPoi

使用模板导出数据

1.引入依赖

        <dependency>
            <groupId>cn.afterturngroupId>
            <artifactId>easypoi-spring-boot-starterartifactId>
            <version>4.2.0version>
        dependency>

2.工具类

package com.junfeng.utils;

import cn.afterturn.easypoi.excel.ExcelExportUtil;
import cn.afterturn.easypoi.excel.ExcelImportUtil;
import cn.afterturn.easypoi.excel.entity.ExportParams;
import cn.afterturn.easypoi.excel.entity.ImportParams;
import cn.afterturn.easypoi.excel.entity.enmus.ExcelType;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.ss.usermodel.Workbook;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.net.URLEncoder;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Excel工具类
 */
public class ExcelUtil {
    /**
     * 导出
     *
     * @param list           数据列表
     * @param title          标题
     * @param sheetName      sheet名称
     * @param pojoClass      元素类型
     * @param fileName       文件名
     * @param isCreateHeader 是否创建列头
     */
    public static void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass, String fileName, boolean isCreateHeader, HttpServletResponse response) throws IOException {
        ExportParams exportParams = new ExportParams(title, sheetName, ExcelType.XSSF);
        exportParams.setCreateHeadRows(isCreateHeader);
        defaultExport(list, pojoClass, fileName, response, exportParams);
    }

    /**
     * 导出
     *
     * @param list      数据列表
     * @param title     标题
     * @param sheetName sheet名称
     * @param pojoClass 元素类型
     * @param fileName  文件名
     */
    public static void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass, String fileName, HttpServletResponse response) throws IOException {
        defaultExport(list, pojoClass, fileName, response, new ExportParams(title, sheetName, ExcelType.XSSF));
    }

    /**
     * 导出,适用于导出多个sheet的Excel,配合createOneSheet方法一起使用
     *
     * @param list     数据列表(元素是Map)
     * @param fileName 文件名
     */
    public static void exportExcel(List<Map<String, Object>> list, String fileName, HttpServletResponse response) throws IOException {
        defaultExport(list, fileName, response);
    }

    /**
     * 导入
     */
    public static <T> List<T> importExcel(String filePath, Integer titleRows, Integer headerRows, Class<T> pojoClass) {
        if (StringUtils.isBlank(filePath)) {
            return Collections.emptyList();
        }
        ImportParams params = new ImportParams();
        params.setTitleRows(titleRows);
        params.setHeadRows(headerRows);
        return ExcelImportUtil.importExcel(new File(filePath), pojoClass, params);
    }

    public static <T> List<T> importExcel(MultipartFile file, Integer titleRows, Integer headerRows, Class<T> pojoClass) throws Exception {
        if (file == null) {
            return Collections.emptyList();
        }
        ImportParams params = new ImportParams();
        params.setTitleRows(titleRows);
        params.setHeadRows(headerRows);
        return ExcelImportUtil.importExcel(file.getInputStream(), pojoClass, params);
    }

    /**
     * 功能描述：根据接收的Excel文件来导入多个sheet,根据索引可返回一个集合
     *
     * @param file       导入文件
     * @param sheetIndex 导入sheet索引,从0开始
     * @param titleRows  表标题的行数
     * @param headerRows 表头行数
     * @param pojoClass  Excel实体类
     */
    public static <T> List<T> importExcel(MultipartFile file, int sheetIndex, Integer titleRows, Integer headerRows, Class<T> pojoClass) throws Exception {
        if (file == null) {
            return Collections.emptyList();
        }
        // 根据file得到Workbook,主要是要根据这个对象获取,传过来的excel有几个sheet页
        ImportParams params = new ImportParams();
        // 第几个sheet页
        params.setStartSheetIndex(sheetIndex);
        params.setTitleRows(titleRows);
        params.setHeadRows(headerRows);
        return ExcelImportUtil.importExcel(file.getInputStream(), pojoClass, params);
    }

    /**
     * 功能描述：根据接收的Excel文件来导入多个sheet,根据索引可返回一个集合
     *
     * @param filePath   导入文件路径
     * @param sheetIndex 导入sheet索引
     * @param titleRows  表标题的行数
     * @param headerRows 表头行数
     * @param pojoClass  Excel实体类
     */
    public static <T> List<T> importExcel(String filePath, int sheetIndex, Integer titleRows, Integer headerRows, Class<T> pojoClass) {
        ImportParams params = new ImportParams();
        params.setStartSheetIndex(sheetIndex);
        params.setTitleRows(titleRows);
        params.setHeadRows(headerRows);
        return ExcelImportUtil.importExcel(new File(filePath), pojoClass, params);
    }

    /**
     * 用于导出多sheet的Excel文件
     *
     * @param sheetName 自定义sheetName
     * @param clazz     pojo实体类
     * @param data      List> or List
     * @return map
     */
    public static Map<String, Object> createOneSheet(String sheetName, Class<?> clazz, List<?> data) {
        ExportParams params = new ExportParams("", sheetName, ExcelType.XSSF);
        return createOneSheet(params, clazz, data);
    }

    /**
     * 创建一个表格并填充内容,返回map供工作簿使用,map的key必须写死
     *
     * @param params 导出配置
     * @param clazz  带@Excel注解字段的POJO实体类
     * @param data   List> or List
     * @return map
     */
    private static Map<String, Object> createOneSheet(ExportParams params, Class<?> clazz, List<?> data) {
        Map<String, Object> map = new HashMap<>(8);
        map.put("title", params);
        map.put("entity", clazz);
        map.put("data", data);
        return map;
    }

    private static void defaultExport(List<?> list, Class<?> pojoClass, String fileName, HttpServletResponse response, ExportParams exportParams) throws IOException {
        Workbook workbook = ExcelExportUtil.exportExcel(exportParams, pojoClass, list);
        if (workbook != null) {
            downLoadExcel(fileName, response, workbook);
        }
    }

    private static void defaultExport(List<Map<String, Object>> list, String fileName, HttpServletResponse response) throws IOException {
        Workbook workbook = ExcelExportUtil.exportExcel(list, ExcelType.XSSF);
        if (workbook != null) {
            downLoadExcel(fileName, response, workbook);
        }
    }

    public static void downLoadExcel(String fileName, HttpServletResponse response, Workbook workbook) throws IOException {
        response.setCharacterEncoding("UTF-8");
        response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
        response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
        workbook.write(response.getOutputStream());
    }
}

3.excel模板

4.导出代码

 @Override
    public void export(List<StorageCapacityVO> result, HttpServletResponse response) throws IOException {
        TemplateExportParams params = new TemplateExportParams(
                "doc/example.xlsx");
        Map<String, Object> map = new HashMap<>();

        List<Map<String, String>> listMap = new ArrayList<>();
        String yyyymm = "";
        String dd = "";
        for (int i = 0; i < result.size(); i++) {
            Map<String, String> lm = new HashMap<>();
            StorageCapacityVO vo = result.get(i);
            Date tm = vo.getTm();
            dd = DateUtil.format(tm, "dd");
            String time = DateUtil.format(tm, "HH:mm:ss");
            yyyymm = DateUtil.format(tm, "yyyy 年 MM 月");

            lm.put("time", time == null ? "" : time);
            lm.put("water", vo.getWater() == null ? "" : vo.getWater() + "");
            lm.put("power", vo.getPower() == null ? "" : vo.getPower() + "");
            lm.put("ecologyFlow", vo.getEcologyFlow() == null ? "" : vo.getEcologyFlow() + "");
            lm.put("downFlow", vo.getDownFlow() == null ? "" : vo.getDownFlow() + "");
            lm.put("warehousing", vo.getWarehousing() == null ? "" : vo.getWarehousing() + "");
            lm.put("q", vo.getQ() == null ? "" : vo.getQ() + "");
            lm.put("z", vo.getZ() == null ? "" : vo.getZ() + "");
            listMap.add(lm);
        }
        map.put("maplist", listMap);

        map.put("yyyymm", yyyymm);
        map.put("dd", dd);

        Workbook workbook = ExcelExportUtil.exportExcel(params, map);
       /*
       	//导出文件到本地
        File savefile = new File("D:/excel/");
        if (!savefile.exists()) {
            savefile.mkdirs();
        }
        FileOutputStream fos = new FileOutputStream("D:/excel/水位记录表_map.xls");
        workbook.write(fos);
        fos.close();*/
        String fileName = "file_" + dd + ".xlsx";
        //返回二进制流给前端
        downLoadExcel(fileName, response, workbook);
    }