在这里，用的技术是poi技术，框架是springBoot+Maven，有需要的参考下

（1）、首先，先引入maven所需的依赖包，我这里用的是3.16版本

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<dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>    
            <version>3.16</version>        
</dependency> 

（2）、引入创建excel表的工具类GradesXLS

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package com.xx.test.utils;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.OutputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;

import javax.servlet.http.HttpServletResponse;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;

/**
* 
* 导出XLS文件
*
*/
public class GradesXLS {

        private String path;

        public GradesXLS() {
                super();
        }
        
        //构造函数获取保存excel路径
        public GradesXLS(String path) {
                super();
                this.path = path;
        }
        
        public Boolean CreateExcel(List<Object[]> dataList, String[] column, String clientName, HttpServletResponse response) throws Exception {
                //创建一个工作簿
                HSSFWorkbook workBook = new HSSFWorkbook();
                //创建一个工作表，名为：第一页
                HSSFSheet sheet = workBook.createSheet(clientName);
                //设置单元格的宽度（0：表示第一行的第一个单元格，1：第一行的第二个单元格）
                sheet.setColumnWidth((short) 0, 3500);
                sheet.setColumnWidth((short) 1, 5000);
                sheet.setColumnWidth((short) 2, 5000);
                //创建一个单元格，从0开始
                HSSFRow row = sheet.createRow((short) 0);
                //构造一个数组设置第一行之后的单元格
                HSSFCell[] cell = new HSSFCell[column.length];
                for (int i = 0; i < column.length; i++) {
                        cell = row.createCell(i);
                        cell.setCellValue(column);
                }
                
                //获得从数据库中查询出来的数据
                if (dataList != null && dataList.size() > 0) {
                        //循环list中的数据
                        for (int i = 0; i < dataList.size(); i++) {
                                Object[] objs = dataList.get(i);
                                HSSFRow dataRow = sheet.createRow(i + 1);
                                HSSFCell data[] = new HSSFCell[column.length];
                                for (int j = 0; j < column.length; j++) {
                                        data[j] = dataRow.createCell(j);
                                        String info = String.valueOf(objs[j]);
                                        System.out.println("GradesXLS:" + info);
                                        data[j].setCellValue((info == null) ? "" : info);
                                }
                         }
                        
                        try {
//                                String fileName = clientName + "-" + String.valueOf(System.currentTimeMillis()).substring(4, 13) + ".xls";
                                //设置日期格式
                                SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
                                // new Date()为获取当前系统时间，也可使用当前时间戳
                                String date = df.format(new Date());
                                String fileName = clientName + "-" + date + ".xls";//文件名，客户端名+日期+文件后缀名
                                response.setContentType("application/vnd.ms-excel");//设置内容格式
                                response.setCharacterEncoding("utf-8");//设置编码格式
                                response.setHeader("Content-disposition", "attachment; filename=" + new String(fileName.getBytes("gbk"), "iso8859-1"));
                                //用IO流来写进去
                                OutputStream os = response.getOutputStream();
                                workBook.write(os);
                                os.flush();
                                return true;
                        } catch (FileNotFoundException e) {
                                // TODO: handle exception
                                e.printStackTrace();
                                return false;
                        } catch (IOException e) {
                                // TODO: handle exception
                                e.printStackTrace();
                                return false;
                        }
                } 
                return false;
        }
        
}

（3）controller类

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@Autowired
        private SubjectService subjectService;

        /**
         * 成绩单
         */
        
        @RequestMapping(value="/subjectList")
        @ResponseBody
        public Object getSubjectList()  {
                
                return subjectService.getSubjectList();
                
        }

（4）最重要的service层来了

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//成绩单
        @Autowired
        private SubjectDao subjectDao;
//方法
public Object subjectExcel(HttpServletResponse response) {
                String[] column = {"学号","语文","数学","英语","体育"};
                String clientName = "成绩单";
        
                //数据组装
                ArrayList<Object[]> dataList = new ArrayList<>();
                List<SubjectOut> subjectList = subjectDao.subjectExcel(SubjectOut.class);//查询数据库表，将结果放入SubjectOut类中返回
                //判断查出来的数据是否为空
                if (subjectList != null && subjectList.size() > 0) {
                        GradesXLS xls = new GradesXLS();//实例化刚才的工具类   //循环添加数据
                        for (SubjectOut subjectInfo : subjectList) {
                                Object[] obj = {subjectInfo.getId(),subjectInfo.getChinese(),subjectInfo.getMath(),subjectInfo.getSports()};
                                dataList.add(obj);
                        }
                        try {
                                return xls.CreateExcel(dataList,column,clientName,response);//将工具类创建出的excel返会下载
                        } catch (Exception e) {
                                e.printStackTrace();
                        }
                }
                return null;
        }

（5）dao层略

（6）数据表

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CREATE TABLE `tb_subject` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `chinese` varchar(255) DEFAULT NULL,
  `math` varchar(255) DEFAULT NULL,
  `english` varchar(255) DEFAULT NULL,
  `sports` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=12 DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of tb_subject
-- ----------------------------
INSERT INTO `tb_subject` VALUES ('1', '98', '100', '87', '90');
INSERT INTO `tb_subject` VALUES ('2', '88', '98', '86', '100');
INSERT INTO `tb_subject` VALUES ('3', '84', '85', '86', '87');
INSERT INTO `tb_subject` VALUES ('4', '91', '92', '93', '94');
INSERT INTO `tb_subject` VALUES ('5', '84', '87', '89', '97');
INSERT INTO `tb_subject` VALUES ('6', '91', '94', '95', '92');
INSERT INTO `tb_subject` VALUES ('7', '94', '92', '97', '91');
INSERT INTO `tb_subject` VALUES ('8', '75', '78', '79', '90');
INSERT INTO `tb_subject` VALUES ('9', '84', '72', '73', '91');
INSERT INTO `tb_subject` VALUES ('10', '85', '81', '72', '73');

奈斯