EasyPoi

使用模板导出数据

1.引入依赖

        <dependency><groupId>cn.afterturn</groupId><artifactId>easypoi-spring-boot-starter</artifactId><version>4.2.0</version></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<Map<String, Object>> or List<POJO>* @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<Map<String, Object>> or List<POJO>* @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.导出代码

 @Overridepublic 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);}