Springboot使用EasyExcel导入导出Excel文件

1，准备Excel文件和数据库表结果

2，导入代码

1，引入依赖

        <!-- https://mvnrepository.com/artifact/com.alibaba/easyexcel --><dependency><groupId>com.alibaba</groupId><artifactId>easyexcel</artifactId><version>3.1.0</version></dependency>

2，创建请求body

import com.alibaba.excel.annotation.ExcelProperty;
import lombok.Data;/*** Description** @author WangYaoLong* @createdate 2023/11/01 0001 11:43*/
@Data
public class StudentImportExcelForm {@ExcelProperty(value = "学生姓名", index = 0)private String name;@ExcelProperty(value = "性别", index = 1)private String sex;@ExcelProperty(value = "学号", index = 2)private String stuId;@ExcelProperty(value = "身份证号", index = 3)private String identityNum;@ExcelProperty(value = "所在班级", index = 4)private String classesId;@ExcelProperty(value = "简介", index = 5)private String remarks;@ExcelProperty(value = "生日", index = 6)private String birthday;
}

3，Excel文件数据解析

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.alibaba.excel.exception.ExcelAnalysisException;
import com.baomidou.mybatisplus.core.toolkit.CollectionUtils;
import com.wang.dog.exception.BusinessException;
import com.wang.dog.pojo.form.StudentImportExcelForm;
import com.wang.dog.service.StudentService;
import com.wang.dog.utils.SpringContextHolder;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.transaction.annotation.Transactional;
import java.util.ArrayList;
import java.util.List;/*** Description** @author WangYaoLong* @createdate 2023/11/01 0001 11:42*/
@Slf4j
public class StudentImportExcelListener extends AnalysisEventListener<StudentImportExcelForm> {private final List<StudentImportExcelForm> list = new ArrayList<>();private final StudentService studentService;public StudentImportExcelListener() {this.studentService = SpringContextHolder.getBean(StudentService.class);}private StringBuilder msg = new StringBuilder();@Overridepublic void invoke(StudentImportExcelForm studentExcelForm, AnalysisContext analysisContext) {log.info("学生信息" + studentExcelForm);checkStudentFiled(studentExcelForm);list.add(studentExcelForm);}/*** 校验学生信息** @param studentExcelForm 学生导入表单*/private void checkStudentFiled(StudentImportExcelForm studentExcelForm) {String name = studentExcelForm.getName();String stuId = studentExcelForm.getStuId();String classesId = studentExcelForm.getClassesId();String sex = studentExcelForm.getSex();String identityNum = studentExcelForm.getIdentityNum();if (StringUtils.isBlank(name)) {msg.append("学生姓名不能为空！");}if (StringUtils.isBlank(stuId)) {msg.append("学生学号不能为空！");}if (StringUtils.isBlank(classesId)) {msg.append("学生所在班级不能为空！");}if (StringUtils.isBlank(sex)) {msg.append("学生性别不能为空！");}if (StringUtils.isBlank(identityNum)) {msg.append("学生身份证信息不能为空！");}}@Overridepublic void doAfterAllAnalysed(AnalysisContext analysisContext) {if (StringUtils.isNotBlank(msg)) {throw new ExcelAnalysisException("导入失败!<br/>" + msg.toString());}if (CollectionUtils.isEmpty(list)) {throw new BusinessException("导入文件为空");}// 保存学生信息saveData();// 清空集合和异常信息msg = null;list.clear();}/*** 保存 加上存储数据库*/@Transactional(rollbackFor = Exception.class)public void saveData() {studentService.importExcelData(list);}
}

4，在StudentService中新增接口以及实现类保存数据

接口方法

   /*** 导入Excel学生信息** @param list 学生信息集合*/void importExcelData(List<StudentImportExcelForm> list);

实现类

    @Overridepublic void importExcelData(List<StudentImportExcelForm> list) {List<Student> studentList = new ArrayList<>();list.forEach(s -> {Student student = new Student();student.setName(s.getName());student.setSex(Integer.parseInt(String.valueOf(s.getSex().equals("男") ? 0 : 1)));student.setStuId(s.getStuId());student.setIdentityNum(s.getIdentityNum());student.setClassesId(s.getClassesId());student.setCreateTime(new Date());student.setUpdateTime(new Date());student.setCreateBy(s.getName());student.setUpdateBy(s.getName());student.setDelFlag(0);student.setRemarks(s.getRemarks());student.setBirthday(s.getBirthday());studentList.add(student);});// 批量保存学生信息this.saveBatch(studentList);}

5，新增导入Excel接口

@Slf4j
@RequestMapping("/student")
@RestController
public class StudentController {@PostMapping("/import")public Result uploadStudentInfo(MultipartFile file) throws IOException {InputStream is = file.getInputStream();EasyExcel.read(is, StudentImportExcelForm.class, new StudentImportExcelListener()).sheet(0).headRowNumber(1).doRead();return Result.ok("success");}
}

6，测试

3，导出Excel

1，导出Excel表单请求

import io.swagger.annotations.ApiModelProperty;
import lombok.Data;/*** Description** @author WangYaoLong* @createdate 2023/11/01 0001 13:03*/
@Data
public class StudentExportExcelForm {@ApiModelProperty(value = "姓名", example = "")private String name;@ApiModelProperty(value = "身份证号", example = "")private String identityNum;@ApiModelProperty(value = "所在班级", example = "")private String classesId;@ApiModelProperty(value = "性别", example = "")private String sex;}

2，返回表单

@Data
@HeadRowHeight(15)	// 高度
@HeadFontStyle(fontHeightInPoints = 10)
@ContentStyle(horizontalAlignment = HorizontalAlignmentEnum.CENTER)	// 字体居中显示
public class StudentExportExcelVo {@ExcelProperty(value = "学生姓名", order = 1)@ColumnWidth(20)	// excel 单元格间距private String name;@ExcelProperty(value = "性别", order = 2)@ColumnWidth(20)private String sex;@ExcelProperty(value = "学号", order = 3)@ColumnWidth(20)private String stuId;@ExcelProperty(value = "身份证号", order = 4)@ColumnWidth(20)private String identityNum;@ExcelProperty(value = "所在班级", order = 5)@ColumnWidth(20)private String classesId;@ExcelProperty(value = "简介", order = 6)@ColumnWidth(20)private String remarks;@ExcelProperty(value = "生日", order = 7)@ColumnWidth(20)private String birthday;
}

3，导出查询接口

    @GetMapping("/export")public void exportStudentExcel(StudentExportExcelForm studentExportExcelForm, HttpServletResponse response) throws Exception {List<StudentExportExcelVo> list = studentService.exportStudent(studentExportExcelForm);// 不带表头//DownExcelUtils.download(response, StudentExportExcelVo.class, list, "学生信息导出");// 增加表头DownExcelUtils.download(response, StudentExportExcelVo.class, list, "学生信息导出", ExportStudentExcelHandler.class);}

4，学生数据查询

    /*** 查询学生信息** @param studentExportExcelForm 学生请求表单* @return List*/List<StudentExportExcelVo> exportStudent(StudentExportExcelForm studentExportExcelForm);

实现类：

    @Overridepublic List<StudentExportExcelVo> exportStudent(StudentExportExcelForm form) {List<StudentExportExcelVo> list = Lists.newArrayList();LambdaQueryWrapper<Student> studentQueryWrapper = Wrappers.<Student>lambdaQuery().orderByAsc(Student::getBirthday);if (StringUtils.isNotBlank(form.getName())) {studentQueryWrapper.like(Student::getName, form.getName());}if (StringUtils.isNotBlank(form.getIdentityNum())) {studentQueryWrapper.eq(Student::getIdentityNum, form.getIdentityNum());}if (StringUtils.isNotBlank(form.getClassesId())) {studentQueryWrapper.eq(Student::getClassesId, form.getClassesId());}if (StringUtils.isNotBlank(form.getSex())) {studentQueryWrapper.eq(Student::getSex, form.getSex().equals("男") ? 0 : 1);}List<Student> studentList = studentMapper.selectList(studentQueryWrapper);if (CollectionUtils.isNotEmpty(studentList)) {studentList.forEach(s -> {StudentExportExcelVo vo = new StudentExportExcelVo();BeanUtils.copyProperties(s, vo);vo.setSex(s.getSex() == 0 ? "男" : "女");list.add(vo);});}return list;}

5，导出工具类

import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.write.handler.WriteHandler;import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.net.URLEncoder;
import java.util.List;/*** @author: WangYaoLong* @date: 2022/8/1* @description: excel导出工具类*/
public class DownExcelUtils {/*** 带有表头提示** @param response* @param t* @param list* @param fileName* @param z* @throws IOException* @throws IllegalAccessException* @throws InstantiationException*/public static void download(HttpServletResponse response, Class t, List list, String fileName, Class z) throws IOException, IllegalAccessException, InstantiationException {// 设置文本内省response.setContentType("application/vnd.ms-excel");response.setCharacterEncoding("utf-8");response.setHeader("Content-disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8") + ".xlsx");EasyExcel.write(response.getOutputStream(), t).sheet(fileName)//设置拦截器或自定义样式.registerWriteHandler((WriteHandler) z.newInstance())//这里1代表第二行开始.relativeHeadRowIndex(1).doWrite(list);}/*** 不带表头提示** @param response* @param t* @param list* @param fileName* @throws IOException*/public static void download(HttpServletResponse response, Class t, List list, String fileName) throws IOException {response.setContentType("application/vnd.ms-excel");response.setCharacterEncoding("utf-8");response.setHeader("Content-disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8") + ".xlsx");EasyExcel.write(response.getOutputStream(), t).sheet(fileName).doWrite(list);}
}

6，表头类

import com.alibaba.excel.write.handler.SheetWriteHandler;
import com.alibaba.excel.write.metadata.holder.WriteSheetHolder;
import com.alibaba.excel.write.metadata.holder.WriteWorkbookHolder;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.HorizontalAlignment;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.VerticalAlignment;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.util.CellRangeAddress;public class ExportStudentExcelHandler implements SheetWriteHandler {@Overridepublic void beforeSheetCreate(WriteWorkbookHolder writeWorkbookHolder, WriteSheetHolder writeSheetHolder) {}@Overridepublic void afterSheetCreate(WriteWorkbookHolder writeWorkbookHolder, WriteSheetHolder writeSheetHolder) {Workbook workbook = writeWorkbookHolder.getWorkbook();Sheet sheet = workbook.getSheetAt(0);CellStyle cellStyle = workbook.createCellStyle();// 自动换行cellStyle.setWrapText(true);cellStyle.setAlignment(HorizontalAlignment.CENTER);cellStyle.setVerticalAlignment(VerticalAlignment.CENTER);//第一行//设置标题Row row = sheet.createRow(0);row.setHeight((short) 900);Cell cell = row.createCell(0);cell.setCellStyle(cellStyle);cell.setCellValue("这是学生信息导出表格(注:xxxxxxxxx数据内容不可更改)");sheet.addMergedRegionUnsafe(new CellRangeAddress(0, 0, 0, 7));}
}

7，接口测试导出