SpringBoot下载excel表格

git地址：https://gitee.com/benming-walnut/download-excel.git

1.目录结构

2.相关依赖

    <parent><artifactId>spring-boot-starter-parent</artifactId><groupId>org.springframework.boot</groupId><version>2.3.8.RELEASE</version></parent><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><!--处理excel、word--><dependency><groupId>org.apache.poi</groupId><artifactId>poi-ooxml</artifactId><version>4.1.0</version></dependency></dependencies>

3.启动类

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication
public class DownloadExcelApplication {public static void main(String[] args) {SpringApplication.run(DownloadExcelApplication.class, args);}
}

4.工具类

package com.qq.utils;import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;/*** @author 黔程似景* @description 用于对象转map* @date 2021/11/18 20:59**/
public class BeanUtils {private BeanUtils() {}/*** 对象转map集合** @param o 需要转换成hashMap的集合* @return* @throws Exception*/public static HashMap<String, Object> objectToMap(Object o) throws Exception {HashMap<String, Object> hashMap = new HashMap<>();Class cls = o.getClass();Field[] fields = cls.getDeclaredFields();for (int i = 0; i < fields.length; i++) {Field f = fields[i];f.setAccessible(true);hashMap.put(f.getName(), f.get(o));}return hashMap;}/*** 对象集合转map版本的集合** @param list* @return* @throws Exception*/public static <E> List<Map<String, Object>> getMapList(List<E> list) throws Exception {List<Map<String, Object>> result = new ArrayList<>();if (list == null) {return result;}for (Object o : list) {HashMap<String, Object> hashMap = objectToMap(o);result.add(hashMap);}return result;}}

5.实体对象

/*** @author 黔程似景* @description TODO* @date 2021/11/18 21:04**/
public class User {private String id;private String name;public User(String id, String name) {this.id = id;this.name = name;}}

6.Controller

import com.qq.service.DownloadExcelService;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;import javax.annotation.Resource;
import javax.servlet.http.HttpServletResponse;/*** @author 黔程似景* @description TODO* @date 2021/11/18 20:56**/
@RestController
public class DownloadExcelController {@Resourceprivate DownloadExcelService downloadExcelService;@GetMapping("/download")public void download(HttpServletResponse response){downloadExcelService.download(response);}}

7.Service

import com.qq.entity.User;
import com.qq.service.DownloadExcelService;
import com.qq.utils.BeanUtils;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.springframework.stereotype.Service;import javax.servlet.http.HttpServletResponse;
import java.io.OutputStream;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.atomic.AtomicInteger;/*** @author 黔程似景* @description TODO* @date 2021/11/18 21:02**/
@Service
public class DownloadExcelServiceImpl implements DownloadExcelService {/*** 下载excel表格* @param response*/@Overridepublic void download(HttpServletResponse response) {try (OutputStream outputStream = response.getOutputStream()) {response.setContentType("application/octet-stream");response.setCharacterEncoding("UTF-8");String s = "导出资源" + ".xls";response.setHeader("Content-disposition", "attachment;filename=" + URLEncoder.encode(s, "UTF-8"));//获取资源，仅支持对象，不支持hashMapList<User> list = new ArrayList<>();User user = new User("1", "法外狂徒");for (int i = 0; i < 10; i++) {list.add(user);}//excel表，表头和表数据对应关系LinkedHashMap<String, String> map = getColumn();//将对象转换成mapList<Map<String, Object>> mapList = BeanUtils.getMapList(list);//进行打印导出HSSFWorkbook write = getHSSFWorkbook(map, mapList);write.write(outputStream);} catch (Exception e) {System.out.println("--------------------------下载异常--------------------------");}}/*** excel表，表头和表数据对应关系** @return 表头与表数据的对应关系*/private LinkedHashMap<String, String> getColumn() {LinkedHashMap<String, String> map = new LinkedHashMap<>();// map.put(表头, 表数据字段)map.put("ID", "id");map.put("用户名", "name");return map;}private HSSFWorkbook getHSSFWorkbook(LinkedHashMap<String, String> map, List<Map<String, Object>> list) {HSSFWorkbook workbook = new HSSFWorkbook();//创建一个sheet，括号里可以输入sheet名称，默认为sheet0Sheet sheet = workbook.createSheet();Row row0 = sheet.createRow(0);AtomicInteger columnIndex = new AtomicInteger();//添加首列为序号列row0.createCell(columnIndex.get()).setCellValue("序号");map.forEach((k, v) -> {row0.createCell(columnIndex.incrementAndGet()).setCellValue(k);});//判空if (list == null) {return workbook;}for (int i = 0; i < list.size(); i++) {Map<String, Object> objectMap = list.get(i);Row row = sheet.createRow(i + 1);for (int j = 0; j < columnIndex.get() + 1; j++) {row.createCell(j);}columnIndex.set(0);//进行导入表数据//表序列号row.getCell(columnIndex.get()).setCellValue(i + 1);//表数据map.forEach((k, v) -> {Object o = objectMap.get(v);if (o != null) {row.getCell(columnIndex.incrementAndGet()).setCellValue(o.toString());} else {row.getCell(columnIndex.incrementAndGet()).setCellValue("");}});}return workbook;}}interface DownloadExcelService {/*** 下载excel表格* @param response*/void download(HttpServletResponse response);
}

8.执行启动类

下载地址：http://localhost:8080/download

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SpringBoot下载excel表格

SpringBoot下载excel表格

1.目录结构

2.相关依赖

3.启动类

4.工具类

5.实体对象

6.Controller

7.Service

8.执行启动类

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