Springboot利用poi导出excel下载

因为项目中之前的做法是用反射获取属性，所以demo中也是用的反射，我看网上很多文章都是存入一个List中，不知道这两种哪种更何合适一点，或者有什么更好的方法也请大佬们赐教。

pom

<dependency><groupId>org.apache.poi</groupId><artifactId>poi</artifactId><version>3.13</version>
</dependency>
<dependency><groupId>org.apache.poi</groupId><artifactId>poi-ooxml</artifactId><version>3.13</version>
</dependency>
<dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><optional>true</optional>
</dependency>

Service

import org.springframework.stereotype.Service;import java.util.ArrayList;
import java.util.List;
@Service
public class StudentService {public List<Student> getList(Student student, int index, int size) {Student student1 = new Student("张三", 90, 18);Student student2 = new Student("李四", 85, 17);Student student3 = new Student("王五", 70, 19);List<Student> list = new ArrayList<>();list.add(student1);list.add(student2);list.add(student3);return list;}
}

Controller

import lombok.Cleanup;
import org.apache.poi.ss.usermodel.Workbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.List;@RestController
public class StudentController {@Autowiredpublic StudentService studentService;@RequestMapping("/exportStudentExcel")public ResponseEntity<byte[]> exportExcel(Student student) {List<Student> list = studentService.getList(student, 0, 10); // 每次只需要改这几行String fileName = "学生成绩统计表"; // 每次只需要改这几行String[] getters = {"getName", "getScore", "getAge"}; // 每次只需要改这几行String[] headers = {"姓名", "分数", "年龄"}; // 每次只需要改这几行Workbook wb = ExcelUtils.createWorkBook(list, getters, headers,student.getClass()); // 每次只需要改这几行@Cleanup ByteArrayOutputStream os = new ByteArrayOutputStream();try {wb.write(os);} catch (IOException e) {e.printStackTrace();}byte[] content = os.toByteArray();HttpHeaders httpHeaders = new HttpHeaders();try {fileName = URLEncoder.encode(fileName, "UTF-8");} catch (UnsupportedEncodingException e) {e.printStackTrace();}httpHeaders.setContentDispositionFormData("attachment", fileName + ".xlsx");return new ResponseEntity<byte[]>(content, httpHeaders, HttpStatus.OK);}
}

ExcelUtils

public class ExcelUtils {/*** 创建excel文档** @param getters list中map的key数组集合* @param headers excel的列名*/public static Workbook createWorkBook(List list, String[] getters, String[] headers, Class clazz) {List<Method> methods = getMethodsByStrs(getters, clazz);// 创建.xlsx工作簿Workbook wb = new XSSFWorkbook();// 创建第一个sheet（页），并命名Sheet sheet = wb.createSheet("sheet1");// 手动设置列宽.第一个参数表示要为第几列设,第二个参数表示列的宽度,n为列高的像素数.for (int i = 0; i < getters.length; i++) {sheet.setColumnWidth((short) i, (short) (35.7 * 200));}// 创建第一行Row header = sheet.createRow(0);// 创建两种单元格格式CellStyle cellStyle1 = wb.createCellStyle();CellStyle cellStyle2 = wb.createCellStyle();// 创建两种字体Font font1 = wb.createFont(); // 标题字体Font font2 = wb.createFont(); // 正文字体// 标题加粗font1.setBoldweight(Font.BOLDWEIGHT_BOLD);// 设置两种单元格的样式setCellStype(cellStyle1, font1);setCellStype(cellStyle2, font2);//设置headerfor (int i = 0; i < headers.length; i++) {Cell cell = header.createCell(i);cell.setCellValue(headers[i]);cell.setCellStyle(cellStyle1);}//设置dataint headersNum = 1;for (int i = 0; i < list.size(); i++) {Row row = sheet.createRow(i + headersNum);for (int j = 0; j < methods.size(); j++) {try {Object invoke = methods.get(j).invoke(list.get(i));if (invoke != null) {row.createCell(j).setCellValue(invoke.toString());}} catch (Exception e) {e.printStackTrace();}}}return wb;}private static void setCellStype(CellStyle cellStyle, Font font) {font.setFontHeightInPoints((short) 10);font.setColor(IndexedColors.BLACK.getIndex());cellStyle.setFont(font);cellStyle.setBorderLeft(CellStyle.BORDER_THIN);cellStyle.setBorderRight(CellStyle.BORDER_THIN);cellStyle.setBorderTop(CellStyle.BORDER_THIN);cellStyle.setBorderBottom(CellStyle.BORDER_THIN);cellStyle.setAlignment(CellStyle.ALIGN_CENTER);}private static List<Method> getMethodsByStrs(String[] getters, Class clazz) {List<Method> list = new ArrayList<>();for (String getter : getters) {try {list.add(clazz.getDeclaredMethod(getter));} catch (NoSuchMethodException e) {e.printStackTrace();}}return list;}
}