使用springboot导出用以上的这个方式写一个controller，要求根据返回数据某个人数据分组之后在合并导出excel

好的，以下是根据返回数据某个人数据分组之后再合并并导出Excel的示例代码：

import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@RestController
public class ExportController {

    @GetMapping("/export")
    public void export(HttpServletResponse response) throws IOException {
        // 假设这里是返回的数据
        List<Map<String, Object>> dataList = new ArrayList<>();
        Map<String, Object> data1 = new HashMap<>();
        data1.put("name", "张三");
        data1.put("age", 18);
        data1.put("score", 90);
        dataList.add(data1);
        Map<String, Object> data2 = new HashMap<>();
        data2.put("name", "李四");
        data2.put("age", 20);
        data2.put("score", 80);
        dataList.add(data2);
        Map<String, Object> data3 = new HashMap<>();
        data3.put("name", "张三");
        data3.put("age", 18);
        data3.put("score", 95);
        dataList.add(data3);

        // 根据姓名分组
        Map<String, List<Map<String, Object>>> groupMap = dataList.stream()
                .collect(Collectors.groupingBy(map -> (String) map.get("name")));

        // 合并分组后的数据
        List<Map<String, Object>> resultList = new ArrayList<>();
        for (Map.Entry<String, List<Map<String, Object>>> entry : groupMap.entrySet()) {
            String name = entry.getKey();
            List<Map<String, Object>> groupList = entry.getValue();
            Map<String, Object> resultData = new HashMap<>();
            resultData.put("name", name);
            int totalScore = 0;
            for (Map<String, Object> groupData : groupList) {
                totalScore += (int) groupData.get("score");
            }
            resultData.put("totalScore", totalScore);
            resultList.add(resultData);
        }

        // 导出Excel
        Workbook workbook = new XSSFWorkbook();
        Sheet sheet = workbook.createSheet("导出数据");
        // 创建标题行
        Row titleRow = sheet.createRow(0);
        Cell nameCell = titleRow.createCell(0);
        nameCell.setCellValue("姓名");
        Cell totalScoreCell = titleRow.createCell(1);
        totalScoreCell.setCellValue("总分数");
        // 创建数据行
        int rowIndex = 1;
        for (Map<String, Object> resultData : resultList) {
            Row dataRow = sheet.createRow(rowIndex++);
            Cell nameDataCell = dataRow.createCell(0);
            nameDataCell.setCellValue((String) resultData.get("name"));
            Cell totalScoreDataCell = dataRow.createCell(1);
            totalScoreDataCell.setCellValue((int) resultData.get("totalScore"));
        }
        // 设置响应头信息
        response.setContentType("application/octet-stream");
        String fileName = URLEncoder.encode("导出数据.xlsx", "UTF-8");
        response.setHeader("Content-Disposition", "attachment;filename=" + fileName);
        // 写出响应
        workbook.write(response.getOutputStream());
    }
}

在这个示例中，我们首先假设这里是返回的数据，然后使用Java 8中的Stream API根据姓名分组。接着，我们遍历分组后的数据，计算每个人的总分数，并将结果放入一个新的列表中。最后，我们创建一个Excel文件，并将列表中的数据写入到Excel中。在写完Excel后，我们设置响应头信息以指示将Excel文件作为附件下载，并将Excel文件写入到响应体中。